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1. What is the unit of electric current (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Volt
- B) Ohm
- C) Ampere
- D) Watt
- Answer: C) Ampere
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2. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm's Law
- B) Kirchhoff's Voltage Law
- C) Kirchhoff's Current Law
- D) Faraday's Law
- Answer: A) Ohm's Law
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3. What is the resistance of a circuit with a voltage of 12V and a current of 2A? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 6 Ohms
- B) 24 Ohms
- C) 12 Ohms
- D) 3 Ohms
- Answer: A) 6 Ohms
4. Which component is used to store electrical energy in an electric field? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: B) Capacitor
5. In a series circuit, the total resistance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the smallest resistance
- B) Equal to the largest resistance
- C) The sum of all resistances
- D) The product of all resistances
- Answer: C) The sum of all resistances
6. What happens to the current in a series circuit if one resistor is removed? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) It increases
- B) It decreases
- C) It remains the same
- D) It stops
- Answer: D) It stops
7. Kirchhoff's Voltage Law states that: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The sum of all voltages around a closed loop is zero
- B) The sum of all currents entering a junction is zero
- C) Voltage is directly proportional to resistance
- D) Current is inversely proportional to resistance
- Answer: A) The sum of all voltages around a closed loop is zero
8. The power dissipated by a resistor can be calculated using: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) P = VI
- B) P = V^2/R
- C) P = I^2R
- D) All of the above
- Answer: D) All of the above
9. What is the equivalent resistance of two 10 ohm resistors in series? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 5 ohms
- B) 10 ohms
- C) 20 ohms
- D) 100 ohms
- Answer: C) 20 ohms
10. What is the equivalent resistance of two 10 ohm resistors in parallel? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 5 ohms
- B) 10 ohms
- C) 20 ohms
- D) 100 ohms
- Answer: A) 5 ohms
11. A device that converts electrical energy into mechanical energy is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Motor
- B) Generator
- C) Transformer
- D) Rectifier
- Answer: A) Motor
12. Which of the following is a non-ohmic conductor? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Filament lamp
- C) Copper wire
- D) Superconductor
- Answer: B) Filament lamp
13. What is the unit of electrical resistance? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ampere
- B) Volt
- C) Ohm
- D) Watt
- Answer: C) Ohm
14. The device used to measure current in a circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltmeter
- B) Ammeter
- C) Ohmmeter
- D) Galvanometer
- Answer: B) Ammeter
15. What is the potential difference between two points if 5 Joules of work is done in moving 1 Coulomb of charge between them? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 1 Volt
- B) 5 Volts
- C) 10 Volts
- D) 0.5 Volts
- Answer: B) 5 Volts
16. In a parallel circuit, the total current is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the sum of the currents through each component
- B) The same through all components
- C) Equal to the product of the currents through each component
- D) Zero
- Answer: A) Equal to the sum of the currents through each component
17. The voltage across a resistor in a series circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The same for all resistors
- B) Proportional to the resistance
- C) Inversely proportional to the resistance
- D) Always zero
- Answer: B) Proportional to the resistance
18. Which of the following materials is a good conductor of electricity? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Rubber
- B) Glass
- C) Wood
- D) Copper
- Answer: D) Copper
19. A resistor has a resistance of 10 ohms. If a current of 2 amperes flows through it, what is the voltage across the resistor? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 20 Volts
- B) 10 Volts
- C) 5 Volts
- D) 2 Volts
- Answer: A) 20 Volts
20. In a DC circuit, power is given by:
- A) P = V/I
- B) P = V^2/R
- C) P = I^2/R
- D) P = V * I
- Answer: D) P = V * I
21. A series circuit has three resistors of 2 ohms, 3 ohms, and 5 ohms. What is the total resistance? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 10 ohms
- B) 5 ohms
- C) 2 ohms
- D) 15 ohms
- Answer: A) 10 ohms
22. The current in a parallel circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The same through all branches
- B) Different through each branch
- C) Equal to the total voltage divided by the total resistance
- D) Zero
- Answer: B) Different through each branch
23. Which component allows current to flow in only one direction? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: D) Diode
24. The SI unit of electric charge is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Coulomb
- B) Ampere
- C) Volt
- D) Ohm
- Answer: A) Coulomb
25. In a circuit with a 12V battery and 3 ohms of resistance, what is the current? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 4A
- B) 6A
- C) 3A
- D) 2A
- Answer: A) 4A
26. If the voltage in a DC circuit is doubled, the current will: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Halve
- B) Stay the same
- C) Double
- D) Quadruple
- Answer: C) Double
27. Which component is used to oppose the flow of current in a circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: A) Resistor
28. In a series circuit with a constant voltage source, if the resistance increases, the current will: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Increase
- B) Decrease
- C) Stay the same
- D) Be zero
- Answer: B) Decrease
29. What is the power dissipated in a resistor of 4 ohms carrying a current of 3A? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 12W
- B) 36W
- C) 48W
- D) 9W
- Answer: B) 36W
30. In a parallel circuit, if one branch opens, the current in the other branches: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Increases
- B) Decreases
- C) Stays the same
- D) Becomes zero
- Answer: C) Stays the same
These questions cover a range of basic concepts related to DC circuits, including Ohm's Law, Kirchhoff's Laws, series and parallel circuits, and basic electrical components.
Topic-Electro Magnetics
Certainly! Here are 30 multiple-choice questions (MCQs) on Electromagnetics, along with their answers:
1. What is the SI unit of magnetic flux? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Tesla
- B) Weber
- C) Henry
- D) Coulomb
- Answer: B) Weber
2. Which law states that the induced electromotive force (emf) in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm's Law
- B) Faraday's Law
- C) Lenz's Law
- D) Ampere's Law
- Answer: B) Faraday's Law
3. What is the unit of magnetic field strength? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Weber
- B) Henry
- C) Tesla
- D) Farad
- Answer: C) Tesla
4. Which material is commonly used for making permanent magnets? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Copper
- B) Iron
- C) Aluminum
- D) Nickel
- Answer: B) Iron
5. What is the phenomenon of generating an electric current in a conductor by changing the magnetic field around it called? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Magnetic reluctance
- B) Electromagnetic induction
- C) Magnetic saturation
- D) Magnetic hysteresis
- Answer: B) Electromagnetic induction
6. Who discovered the relationship between electricity and magnetism? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Isaac Newton
- B) Albert Einstein
- C) Michael Faraday
- D) James Clerk Maxwell
- Answer: C) Michael Faraday
7. Which of the following is a non-magnetic material? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Iron
- B) Nickel
- C) Cobalt
- D) Plastic
- Answer: D) Plastic
8. The direction of the magnetic field around a current-carrying conductor can be determined by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm's Law
- B) Fleming's Left-Hand Rule
- C) Right-Hand Grip Rule
- D) Faraday's Law
- Answer: C) Right-Hand Grip Rule
9. In an electromagnetic wave, the electric and magnetic fields are: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Parallel to each other
- B) Perpendicular to each other
- C) Both zero
- D) In phase with each other
- Answer: B) Perpendicular to each other
10. What is the force on a current-carrying conductor in a magnetic field called? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Electromotive force
- B) Lorentz force
- C) Electrostatic force
- D) Gravitational force
- Answer: B) Lorentz force
11. What is the magnetic field inside a long, straight, current-carrying solenoid? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Zero
- B) Uniform
- C) Varies linearly with distance
- D) Exponentially increasing
- Answer: B) Uniform
12. The relative permeability of a paramagnetic material is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Less than 1
- B) Greater than 1
- C) Equal to 1
- D) Negative
- Answer: B) Greater than 1
13. The total magnetic flux through a closed surface is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Zero
- B) Equal to the net charge enclosed
- C) Proportional to the current enclosed
- D) Infinite
- Answer: A) Zero
14. Which device converts mechanical energy into electrical energy using electromagnetic induction? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Motor
- B) Generator
- C) Transformer
- D) Rectifier
- Answer: B) Generator
15. What is the phenomenon where a change in current in one coil induces a voltage in a nearby coil? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Self-induction
- B) Mutual induction
- C) Eddy current
- D) Magnetic reluctance
- Answer: B) Mutual induction
16. Which law describes the magnetic field produced by a current-carrying wire? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm's Law
- B) Faraday's Law
- C) Ampere's Law
- D) Lenz's Law
- Answer: C) Ampere's Law
17. The opposition that a magnetic circuit offers to magnetic flux is called: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistance
- B) Inductance
- C) Reluctance
- D) Conductance
- Answer: C) Reluctance
18. A coil with a high inductance: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Has a small magnetic field
- B) Opposes changes in current strongly
- C) Has a low number of turns
- D) Allows current to pass easily
- Answer: B) Opposes changes in current strongly
19. The unit of inductance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Farad
- B) Henry
- C) Tesla
- D) Weber
- Answer: B) Henry
20. The principle of operation of a transformer is based on: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Self-induction
- B) Mutual induction
- C) Electrostatic induction
- D) Magnetic repulsion
- Answer: B) Mutual induction
21. Which of the following is a type of electromagnetic wave? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Sound wave
- B) Water wave
- C) Light wave
- D) Seismic wave
- Answer: C) Light wave
22. The frequency of an electromagnetic wave is inversely proportional to its: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Amplitude
- B) Speed
- C) Wavelength
- D) Energy
- Answer: C) Wavelength
23. A changing magnetic field induces an electric field. This is described by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Faraday's Law
- B) Lenz's Law
- C) Maxwell's Equations
- D) Ampere's Law
- Answer: A) Faraday's Law
24. What is the speed of electromagnetic waves in a vacuum? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 3 x 10^6 m/s
- B) 3 x 10^8 m/s
- C) 3 x 10^10 m/s
- D) 3 x 10^12 m/s
- Answer: B) 3 x 10^8 m/s
25. Which of the following electromagnetic waves has the longest wavelength? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) X-rays
- B) Ultraviolet
- C) Visible light
- D) Radio waves
- Answer: D) Radio waves
26. What type of current is required to produce a steady magnetic field? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Alternating current (AC)
- B) Direct current (DC)
- C) Pulsating current
- D) No current
- Answer: B) Direct current (DC)
27. The core of an electromagnet is made of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Plastic
- B) Wood
- C) Soft iron
- D) Aluminum
- Answer: C) Soft iron
28. Which of the following describes the interaction between electricity and magnetism? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm's Law
- B) Gauss's Law
- C) Electromagnetism
- D) Coulomb's Law
- Answer: C) Electromagnetism
29. The angle between the electric and magnetic fields in an electromagnetic wave is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0 degrees
- B) 45 degrees
- C) 90 degrees
- D) 180 degrees
- Answer: C) 90 degrees
30. Which scientist is credited with unifying the theory of electricity and magnetism? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Isaac Newton
- B) Albert Einstein
- C) Michael Faraday
- D) James Clerk Maxwell
- Answer: D) James Clerk Maxwell
These questions cover various fundamental aspects of electromagnetics, including magnetic fields, electromagnetic induction, electromagnetic waves, and the key laws and principles governing these phenomena.
3.Topic- AC Circuits
Sure! Here are 30 multiple-choice questions (MCQs) on AC Circuits, along with their answers:
1. What is the typical frequency of AC mains electricity in most countries? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 50 Hz
- B) 60 Hz
- C) 120 Hz
- D) 100 Hz
- Answer: A) 50 Hz
2. What does RMS stand for in the context of AC circuits? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Random Mean Square
- B) Root Mean Square
- C) Real Mean Square
- D) Rotational Mean Square
- Answer: B) Root Mean Square
3. The phase difference between voltage and current in a pure resistive AC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0 degrees
- B) 45 degrees
- C) 90 degrees
- D) 180 degrees
- Answer: A) 0 degrees
4. In a purely inductive AC circuit, the current: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Leads the voltage by 90 degrees
- B) Lags the voltage by 90 degrees
- C) Is in phase with the voltage
- D) Is out of phase with the voltage by 180 degrees
- Answer: B) Lags the voltage by 90 degrees
5. What is the formula for the capacitive reactance (Xc) in an AC circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Xc = 1 / (2πfC)
- B) Xc = 2πfC
- C) Xc = f / (2πC)
- D) Xc = 2πf / C
- Answer: A) Xc = 1 / (2πfC)
6. In a purely capacitive AC circuit, the current: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Leads the voltage by 90 degrees
- B) Lags the voltage by 90 degrees
- C) Is in phase with the voltage
- D) Is out of phase with the voltage by 180 degrees
- Answer: A) Leads the voltage by 90 degrees
7. The total opposition to current flow in an AC circuit is called: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistance
- B) Inductance
- C) Capacitance
- D) Impedance
- Answer: D) Impedance
8. What is the unit of impedance? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm
- B) Henry
- C) Farad
- D) Siemens
- Answer: A) Ohm
9. The power factor in a purely resistive circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0
- B) 0.5
- C) 1
- D) Infinity
- Answer: C) 1
10. In an RLC series circuit at resonance, the impedance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Minimum
- B) Maximum
- C) Zero
- D) Infinity
- Answer: A) Minimum
11. What happens to the current in an AC circuit if the frequency is increased? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) It increases
- B) It decreases
- C) It remains the same
- D) It becomes zero
- Answer: B) It decreases
12. The reactance of an inductor (XL) in an AC circuit is given by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) XL = 1 / (2πfL)
- B) XL = 2πfL
- C) XL = f / (2πL)
- D) XL = 2πL / f
- Answer: B) XL = 2πfL
13. In an AC circuit containing only inductance, the phase angle between voltage and current is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0 degrees
- B) 45 degrees
- C) 90 degrees
- D) 180 degrees
- Answer: C) 90 degrees
14. The average power consumed in a purely inductive or capacitive AC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Maximum
- B) Zero
- C) Equal to RMS power
- D) Infinite
- Answer: B) Zero
15. The term "power factor" refers to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The ratio of real power to apparent power
- B) The ratio of apparent power to real power
- C) The product of real power and apparent power
- D) The sum of real power and apparent power
- Answer: A) The ratio of real power to apparent power
16. In an AC circuit, the real power (P) is calculated using the formula: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) P = VI cos(θ)
- B) P = VI sin(θ)
- C) P = VI tan(θ)
- D) P = VI cot(θ)
- Answer: A) P = VI cos(θ)
17. In a series RLC circuit, at resonance, the power factor is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0
- B) 0.5
- C) 1
- D) Infinity
- Answer: C) 1
18. The impedance of a series RLC circuit at resonance is equal to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The inductive reactance
- B) The capacitive reactance
- C) The resistance
- D) Zero
- Answer: C) The resistance
19. Which component in an AC circuit causes a phase shift between voltage and current? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Inductor
- C) Capacitor
- D) Both B and C
- Answer: D) Both B and C
20. The angular frequency (ω) of an AC circuit is given by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) ω = 2πf
- B) ω = f / 2π
- C) ω = 1 / (2πf)
- D) ω = 2π / f
- Answer: A) ω = 2πf
21. In a parallel RLC circuit, the current through each branch is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The same
- B) Different
- C) Zero
- D) Maximum
- Answer: B) Different
22. In an AC circuit, the term "apparent power" is represented by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Real power
- B) Reactive power
- C) Complex power
- D) True power
- Answer: C) Complex power
23. Which of the following devices measures the RMS value of AC voltage? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltmeter
- B) Ammeter
- C) Wattmeter
- D) Oscilloscope
- Answer: A) Voltmeter
24. In an AC circuit, if the current leads the voltage, the circuit is predominantly: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistive
- B) Inductive
- C) Capacitive
- D) Non-reactive
- Answer: C) Capacitive
25. The efficiency of an AC circuit with a power factor of 1 is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0%
- B) 50%
- C) 75%
- D) 100%
- Answer: D) 100%
26. The current waveform in an AC circuit with a purely capacitive load is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Sinusoidal
- B) Square
- C) Triangular
- D) Sawtooth
- Answer: A) Sinusoidal
27. In an AC circuit, what does the term "reactive power" refer to? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Power used to perform work
- B) Power stored and returned by reactive components
- C) Power lost as heat
- D) Power delivered to the load
- Answer: B) Power stored and returned by reactive components
28. The formula for calculating the total impedance (Z) in a series RLC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Z = R + j(XL - XC)
- B) Z = R - j(XL + XC)
- C) Z = R - j(XL - XC)
- D) Z = R + j(XL + XC)
- Answer: A) Z = R + j(XL - XC)
29. The bandwidth of a series RLC circuit is determined by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The resistance
- B) The inductance
- C) The capacitance
- D) Both B and C
- Answer: A) The resistance
30. In a balanced three-phase AC system, the power delivered to the load is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the power in one phase
- B) Three times the power in one phase
- C) Zero
- D) Twice the power in one phase
- Answer: B) Three times the power in one phase
These questions cover various fundamental aspects of AC circuits, including frequency, phase relationships, impedance, resonance, power factors, and
1. Topic-4 Electrical Circuits and Systems
Sure! Here are 30 multiple-choice questions (MCQs) on Electrical Circuits and Systems, along with their answers:
1. What is the unit of electric current? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Volt
- B) Ohm
- C) Ampere
- D) Watt
- Answer: C) Ampere
2. Ohm's Law states the relationship between: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltage, resistance, and capacitance
- B) Voltage, current, and resistance
- C) Power, resistance, and current
- D) Voltage, current, and power
- Answer: B) Voltage, current, and resistance
3. In a series circuit, the total resistance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The sum of the individual resistances
- B) The product of the individual resistances
- C) The average of the individual resistances
- D) None of the above
- Answer: A) The sum of the individual resistances
4. Kirchhoff's Voltage Law (KVL) states that: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The total current entering a junction is equal to the total current leaving
- B) The sum of all voltages around a closed loop is zero
- C) The total power in a circuit is conserved
- D) The sum of all currents in a closed loop is zero
- Answer: B) The sum of all voltages around a closed loop is zero
5. In a parallel circuit, the total resistance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The sum of the individual resistances
- B) Less than the smallest individual resistance
- C) The average of the individual resistances
- D) Greater than the largest individual resistance
- Answer: B) Less than the smallest individual resistance
6. The unit of electrical power is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Joule
- B) Coulomb
- C) Watt
- D) Volt
- Answer: C) Watt
7. What does a capacitor store? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Electric charge
- B) Magnetic flux
- C) Electric current
- D) Thermal energy
- Answer: A) Electric charge
8. The time constant of an RC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) R + C
- B) RC
- C) R / C
- D) C / R
- Answer: B) RC
9. What is the primary function of a diode? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) To amplify signals
- B) To store energy
- C) To allow current to flow in one direction only
- D) To resist current flow
- Answer: C) To allow current to flow in one direction only
10. In an AC circuit, what does the power factor represent? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The ratio of real power to apparent power
- B) The ratio of reactive power to apparent power
- C) The sum of real power and apparent power
- D) The difference between real power and apparent power
- Answer: A) The ratio of real power to apparent power
11. What is the purpose of a transformer?
- A) To convert AC to DC
- B) To convert electrical energy to mechanical energy
- C) To change the voltage level in an AC circuit
- D) To store electrical energy
- Answer: C) To change the voltage level in an AC circuit
12. The impedance of a circuit is a combination of:
- A) Resistance and capacitance
- B) Resistance and inductance
- C) Resistance, inductance, and capacitance
- D) Inductance and capacitance only
- Answer: C) Resistance, inductance, and capacitance
13. In a purely resistive AC circuit, the voltage and current are:
- A) In phase
- B) Out of phase by 90 degrees
- C) Out of phase by 180 degrees
- D) At a phase angle of 45 degrees
- Answer: A) In phase
14. Which law states that the sum of currents entering a junction is equal to the sum of currents leaving the junction? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Kirchhoff's Voltage Law (KVL)
- B) Kirchhoff's Current Law (KCL)
- C) Ohm's Law
- D) Faraday's Law
- Answer: B) Kirchhoff's Current Law (KCL)
15. The unit of inductance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Farad
- B) Henry
- C) Coulomb
- D) Watt
- Answer: B) Henry
16. What is the function of a resistor in an electrical circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) To increase current
- B) To decrease voltage
- C) To limit current
- D) To store energy
- Answer: C) To limit current
17. What is the formula for electrical power in terms of voltage and current? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) P = VI
- B) P = V/I
- C) P = V + I
- D) P = V - I
- Answer: A) P = VI
18. What is the phase angle in a purely capacitive AC circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0 degrees
- B) 45 degrees
- C) 90 degrees
- D) 180 degrees
- Answer: C) 90 degrees
19. Which component is used to store energy in a magnetic field? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: C) Inductor
20. The Q factor of a resonant circuit is a measure of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Power loss
- B) Energy storage
- C) Resonance frequency
- D) Bandwidth
- Answer: B) Energy storage
21. In a series RLC circuit, the resonance frequency is given by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 1 / (2π√(LC))
- B) 2π√(LC)
- C) √(L/C)
- D) LC
- Answer: A) 1 / (2π√(LC))
22. What is the main characteristic of an ideal voltage source? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Zero internal resistance
- B) Infinite internal resistance
- C) Zero voltage
- D) Constant current
- Answer: A) Zero internal resistance
23. What does a Thevenin equivalent circuit consist of? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) A voltage source and a resistor in series
- B) A current source and a resistor in parallel
- C) A voltage source and a resistor in parallel
- D) A current source and a resistor in series
- Answer: A) A voltage source and a resistor in series
24. Norton's Theorem states that any linear electrical network can be replaced by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) A voltage source in series with a resistor
- B) A current source in series with a resistor
- C) A current source in parallel with a resistor
- D) A voltage source in parallel with a resistor
- Answer: C) A current source in parallel with a resistor
25. The main purpose of a fuse in an electrical circuit is to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Limit the current
- B) Protect against overcurrent
- C) Regulate the voltage
- D) Store electrical energy
- Answer: B) Protect against overcurrent
26. A device that converts AC to DC is called: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Inverter
- B) Rectifier
- C) Transformer
- D) Regulator
- Answer: B) Rectifier
27. What is the main advantage of using a capacitor in an AC circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) To increase current
- B) To block DC components
- C) To store magnetic energy
- D) To increase voltage
- Answer: B) To block DC components
28. What is the phase relationship between current and voltage in a purely inductive circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Current leads voltage by 90 degrees
- B) Voltage leads current by 90 degrees
- C) They are in phase
- D) They are 180 degrees out of phase
- Answer: B) Voltage leads current by 90 degrees
29. What does an oscilloscope measure? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Current
- B) Voltage over time
- C) Resistance
- D) Power
- Answer: B) Voltage over time
30. The unit of electrical conductance is:
- A) Ohm
- B) Siemens
- C) Henry
- D) Farad
- Answer: B) Siemens
These questions cover a wide range of topics in electrical circuits and systems, including basic principles, components, laws, and theorems.
Topic-5 dc circuit
1. What is the unit of electric current? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Volt
- B) Ohm
- C) Ampere
- D) Watt
- Answer: C) Ampere
2. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm's Law
- B) Kirchhoff's Voltage Law
- C) Kirchhoff's Current Law
- D) Faraday's Law
- Answer: A) Ohm's Law
3. What is the resistance of a circuit with a voltage of 12V and a current of 2A? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 6 Ohms
- B) 24 Ohms
- C) 12 Ohms
- D) 3 Ohms
- Answer: A) 6 Ohms
4. Which component is used to store electrical energy in an electric field? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: B) Capacitor
5. In a series circuit, the total resistance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the smallest resistance
- B) Equal to the largest resistance
- C) The sum of all resistances
- D) The product of all resistances
- Answer: C) The sum of all resistances
6. What happens to the current in a series circuit if one resistor is removed? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) It increases
- B) It decreases
- C) It remains the same
- D) It stops
- Answer: D) It stops
7. Kirchhoff's Voltage Law states that: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The sum of all voltages around a closed loop is zero
- B) The sum of all currents entering a junction is zero
- C) Voltage is directly proportional to resistance
- D) Current is inversely proportional to resistance
- Answer: A) The sum of all voltages around a closed loop is zero
8. The power dissipated by a resistor can be calculated using: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) P = VI
- B) P = V^2/R
- C) P = I^2R
- D) All of the above
- Answer: D) All of the above
9. What is the equivalent resistance of two 10 ohm resistors in series? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 5 ohms
- B) 10 ohms
- C) 20 ohms
- D) 100 ohms
- Answer: C) 20 ohms
10. What is the equivalent resistance of two 10 ohm resistors in parallel? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 5 ohms
- B) 10 ohms
- C) 20 ohms
- D) 100 ohms
- Answer: A) 5 ohms
11. A device that converts electrical energy into mechanical energy is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Motor
- B) Generator
- C) Transformer
- D) Rectifier
- Answer: A) Motor
12. Which of the following is a non-ohmic conductor? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Filament lamp
- C) Copper wire
- D) Superconductor
- Answer: B) Filament lamp
13. What is the unit of electrical resistance? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ampere
- B) Volt
- C) Ohm
- D) Watt
- Answer: C) Ohm
14. The device used to measure current in a circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltmeter
- B) Ammeter
- C) Ohmmeter
- D) Galvanometer
- Answer: B) Ammeter
15. What is the potential difference between two points if 5 Joules of work is done in moving 1 Coulomb of charge between them? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 1 Volt
- B) 5 Volts
- C) 10 Volts
- D) 0.5 Volts
- Answer: B) 5 Volts
16. In a parallel circuit, the total current is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the sum of the currents through each component
- B) The same through all components
- C) Equal to the product of the currents through each component
- D) Zero
- Answer: A) Equal to the sum of the currents through each component
17. The voltage across a resistor in a series circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The same for all resistors
- B) Proportional to the resistance
- C) Inversely proportional to the resistance
- D) Always zero
- Answer: B) Proportional to the resistance
18. Which of the following materials is a good conductor of electricity? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Rubber
- B) Glass
- C) Wood
- D) Copper
- Answer: D) Copper
19. A resistor has a resistance of 10 ohms. If a current of 2 amperes flows through it, what is the voltage across the resistor? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 20 Volts
- B) 10 Volts
- C) 5 Volts
- D) 2 Volts
- Answer: A) 20 Volts
20. In a DC circuit, power is given by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) P = V/I
- B) P = V^2/R
- C) P = I^2/R
- D) P = V * I
- Answer: D) P = V * I
21. A series circuit has three resistors of 2 ohms, 3 ohms, and 5 ohms. What is the total resistance? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 10 ohms
- B) 5 ohms
- C) 2 ohms
- D) 15 ohms
- Answer: A) 10 ohms
22. The current in a parallel circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) The same through all branches
- B) Different through each branch
- C) Equal to the total voltage divided by the total resistance
- D) Zero
- Answer: B) Different through each branch
23. Which component allows current to flow in only one direction? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: D) Diode
24. The SI unit of electric charge is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Coulomb
- B) Ampere
- C) Volt
- D) Ohm
- Answer: A) Coulomb
25. In a circuit with a 12V battery and 3 ohms of resistance, what is the current? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 4A
- B) 6A
- C) 3A
- D) 2A
- Answer: A) 4A
26. If the voltage in a DC circuit is doubled, the current will: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Halve
- B) Stay the same
- C) Double
- D) Quadruple
- Answer: C) Double
27. Which component is used to oppose the flow of current in a circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: A) Resistor
28. In a series circuit with a constant voltage source, if the resistance increases, the current will: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Increase
- B) Decrease
- C) Stay the same
- D) Be zero
- Answer: B) Decrease
29. What is the power dissipated in a resistor of 4 ohms carrying a current of 3A? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 12W
- B) 36W
- C) 48W
- D) 9W
- Answer: B) 36W
30. In a parallel circuit, if one branch opens, the current in the other branches: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Increases
- B) Decreases
- C) Stays the same
- D) Becomes zero
- Answer: C) Stays the same
1. Topic-6 Classification of Materials
Certainly! Here are 30 multiple-choice questions (MCQs) on the topic "Classification of Materials," along with their answers:
1. Materials that are good conductors of electricity are generally: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ceramics
- B) Polymers
- C) Metals
- D) Composites
- Answer: C) Metals
2. Which of the following is a characteristic property of ceramics? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) High thermal conductivity
- B) High electrical conductivity
- C) High melting point
- D) High ductility
- Answer: C) High melting point
3. Polymers are primarily made up of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Metallic bonds
- B) Ionic bonds
- C) Covalent bonds
- D) Van der Waals bonds
- Answer: C) Covalent bonds
4. A material that exhibits a combination of different properties to improve performance is known as: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Metal
- B) Polymer
- C) Composite
- D) Ceramic
- Answer: C) Composite
5. Which of the following materials is typically used for electrical insulation? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Metal
- B) Ceramic
- C) Polymer
- D) Composite
- Answer: C) Polymer
6. The primary element in the composition of steel is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Aluminum
- B) Iron
- C) Copper
- D) Zinc
- Answer: B) Iron
7. Materials that do not allow electricity to flow through them easily are called: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Conductors
- B) Semiconductors
- C) Insulators
- D) Superconductors
- Answer: C) Insulators
8. Which of the following is an example of a composite material? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Glass
- B) Nylon
- C) Concrete
- D) Aluminum
- Answer: C) Concrete
9. The main characteristic of semiconductors is their ability to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Conduct electricity at low temperatures
- B) Insulate against electric current
- C) Conduct electricity under certain conditions
- D) Reflect light efficiently
- Answer: C) Conduct electricity under certain conditions
10. Which of the following materials is known for its high strength-to-weight ratio? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Steel
- B) Titanium
- C) Aluminum
- D) Copper
- Answer: B) Titanium
11. Thermoplastics are a type of polymer that: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Cannot be recycled
- B) Soften when heated and harden when cooled
- C) Are always brittle
- D) Decompose when heated
- Answer: B) Soften when heated and harden when cooled
12. Which type of material is typically used for making solar cells? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Metals
- B) Ceramics
- C) Polymers
- D) Semiconductors
- Answer: D) Semiconductors
13. Which of the following materials is a good thermal insulator? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Copper
- B) Glass wool
- C) Aluminum
- D) Silver
- Answer: B) Glass wool
14. The primary component of glass is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Silicon dioxide
- B) Aluminum oxide
- C) Magnesium oxide
- D) Calcium oxide
- Answer: A) Silicon dioxide
15. Which of the following materials is commonly used in the aerospace industry due to its lightweight and strength? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Steel
- B) Titanium
- C) Lead
- D) Zinc
- Answer: B) Titanium
16. What type of material is Kevlar, known for its high strength and used in bulletproof vests? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Metal
- B) Ceramic
- C) Polymer
- D) Composite
- Answer: C) Polymer
17. Which of the following is an example of a ferrous metal? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Aluminum
- B) Brass
- C) Steel
- D) Copper
- Answer: C) Steel
18. Materials that exhibit superconductivity are known for: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Having high electrical resistance
- B) Conducting electricity with no resistance
- C) Being excellent thermal conductors
- D) Having low melting points
- Answer: B) Conducting electricity with no resistance
19. Which type of polymer is used in plastic bags? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Polyethylene
- B) Polypropylene
- C) Polystyrene
- D) Polycarbonate
- Answer: A) Polyethylene
20. Ceramic materials are generally: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ductile and conductive
- B) Brittle and insulative
- C) Malleable and conductive
- D) Soft and flexible
- Answer: B) Brittle and insulative
21. Which of the following is a property of metallic materials? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) High thermal conductivity
- B) Low electrical conductivity
- C) High transparency
- D) High brittleness
- Answer: A) High thermal conductivity
22. What is the primary advantage of composite materials over traditional materials? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Lower cost
- B) Higher strength-to-weight ratio
- C) Simpler manufacturing process
- D) Higher electrical conductivity
- Answer: B) Higher strength-to-weight ratio
23. A material that can return to its original shape after deformation is called: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Plastic
- B) Elastic
- C) Brittle
- D) Ductile
- Answer: B) Elastic
24. Which of the following is an example of a thermosetting polymer? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Polyethylene
- B) Polypropylene
- C) Bakelite
- D) Polystyrene
- Answer: C) Bakelite
25. Which material is commonly used in electronic circuit boards for its insulating properties? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Copper
- B) Aluminum
- C) Silicon
- D) Epoxy resin
- Answer: D) Epoxy resin
26. Alloys are typically made to improve: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Electrical conductivity
- B) Thermal expansion
- C) Mechanical properties
- D) Optical clarity
- Answer: C) Mechanical properties
27. Which of the following materials is known for its use in magnets? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Aluminum
- B) Iron
- C) Copper
- D) Lead
- Answer: B) Iron
28. Which type of material is used for manufacturing electronic chips? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Metal
- B) Ceramic
- C) Semiconductor
- D) Composite
- Answer: C) Semiconductor
29. The primary use of refractory materials is in: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Electrical wiring
- B) Thermal insulation
- C) High-temperature applications
- D) Soundproofing
- Answer: C) High-temperature applications
30. Which of the following is a property of ferrous alloys? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Non-magnetic
- B) High corrosion resistance
- C) High magnetic permeability
- D) Low tensile strength
- Answer: C) High magnetic permeability
These questions cover various aspects of materials science, including properties, applications, and types of materials.
1. Topic-7 Active and Passive Components
Sure! Here are 30 multiple-choice questions (MCQs) on the topic "Active and Passive Components," along with their answers:
1. Which of the following is an active component? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Diode
- D) Inductor
- Answer: C) Diode
2. A transistor is classified as a(n): (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Passive component
- B) Active component
- C) Electrochemical component
- D) Electromechanical component
- Answer: B) Active component
3. Which of the following is a passive component? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Operational amplifier
- B) LED
- C) Transformer
- D) Microcontroller
- Answer: C) Transformer
4. An active component can: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Store energy
- B) Release energy
- C) Control the flow of electricity
- D) None of the above
- Answer: C) Control the flow of electricity
5. Which of the following components can amplify a signal? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Capacitor
- B) Resistor
- C) Transistor
- D) Inductor
- Answer: C) Transistor
6. Which of these components is used to oppose the flow of current in a circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Transistor
- B) Resistor
- C) Diode
- D) Capacitor
- Answer: B) Resistor
7. A diode allows current to flow in: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Both directions
- B) One direction only
- C) Alternating directions
- D) None of the above
- Answer: B) One direction only
8. Which of the following is an active component that can convert AC to DC? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Capacitor
- B) Diode
- C) Resistor
- D) Inductor
- Answer: B) Diode
9. An inductor is a type of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Active component
- B) Passive component
- C) Semiconductor
- D) Energy source
- Answer: B) Passive component
10. Which component stores electrical energy in an electric field? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Inductor
- B) Resistor
- C) Capacitor
- D) Transistor
- Answer: C) Capacitor
11. Which of the following is NOT a passive component? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Operational amplifier
- D) Inductor
- Answer: C) Operational amplifier
12. A Light Emitting Diode (LED) is an example of a(n): (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Passive component
- B) Active component
- C) Linear component
- D) Electrochemical component
- Answer: B) Active component
13. Which of the following is primarily used for filtering signals? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Transistor
- B) Diode
- C) Capacitor
- D) Resistor
- Answer: C) Capacitor
14. What is the primary function of a resistor in a circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) To store charge
- B) To resist the flow of current
- C) To amplify signals
- D) To convert AC to DC
- Answer: B) To resist the flow of current
15. Which component can be used to store magnetic energy? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Capacitor
- B) Inductor
- C) Resistor
- D) Transistor
- Answer: B) Inductor
16. Which of the following components is used in tuning circuits for radios? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Diode
- B) Capacitor
- C) Resistor
- D) Inductor
- Answer: D) Inductor
17. Which active component is used to control the flow of electricity in integrated circuits? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Transistor
- D) Inductor
- Answer: C) Transistor
18. Which of the following components is used to rectify AC voltage? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Capacitor
- C) Inductor
- D) Diode
- Answer: D) Diode
19. An operational amplifier (op-amp) is classified as a(n): (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Passive component
- B) Active component
- C) Electromechanical component
- D) Electromagnetic component
- Answer: B) Active component
20. Which component is typically used to smooth out the fluctuations in a power supply? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Inductor
- B) Diode
- C) Capacitor
- D) Resistor
- Answer: C) Capacitor
21. The primary function of a transformer is to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Store electrical energy
- B) Change the voltage level
- C) Rectify current
- D) Amplify signals
- Answer: B) Change the voltage level
22. In an electronic circuit, a capacitor is used to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Block DC while allowing AC to pass
- B) Block AC while allowing DC to pass
- C) Rectify AC voltage
- D) Amplify electrical signals
- Answer: A) Block DC while allowing AC to pass
23. Which of the following components has the ability to switch electronic signals on and off? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistor
- B) Inductor
- C) Capacitor
- D) Transistor
- Answer: D) Transistor
24. A Zener diode is specifically designed to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Block current flow
- B) Conduct in one direction only
- C) Maintain a constant voltage
- D) Store charge
- Answer: C) Maintain a constant voltage
25. Which of the following is a characteristic of passive components? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Can amplify signals
- B) Require external power source to operate
- C) Cannot amplify or generate electrical signals
- D) Can control the direction of current flow
- Answer: C) Cannot amplify or generate electrical signals
26. A photodiode is an example of a(n): (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Passive component
- B) Active component
- C) Linear component
- D) Magnetic component
- Answer: B) Active component
27. The energy stored in an inductor is proportional to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltage
- B) Current squared
- C) Capacitance
- D) Resistance
- Answer: B) Current squared
28. A voltage regulator is used to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Increase the voltage
- B) Decrease the voltage
- C) Maintain a constant voltage
- D) Convert AC to DC
- Answer: C) Maintain a constant voltage
29. Which of the following is a characteristic of an active component? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Does not require a power source
- B) Can amplify electrical signals
- C) Cannot store energy
- D) Only used for filtering signals
- Answer: B) Can amplify electrical signals
30. A capacitor opposes changes in: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltage
- B) Current
- C) Resistance
- D) Power
- Answer: A) Voltage
These questions cover various aspects of active and passive components, including their functions, characteristics, and applications in electronic circuits.
Topic-8 AC Fundamentals
Sure! Here are 30 multiple-choice questions (MCQs) on the topic "AC Fundamentals," along with their answers:
1. What does AC stand for in electrical terms? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Alternating Current
- B) Anodic Current
- C) Absolute Current
- D) Auxiliary Current
- Answer: A) Alternating Current
2. The frequency of standard AC power in most of the world is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 50 Hz
- B) 60 Hz
- C) 75 Hz
- D) 100 Hz
- Answer: A) 50 Hz
3. In the United States, the standard frequency of AC power is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 40 Hz
- B) 50 Hz
- C) 60 Hz
- D) 70 Hz
- Answer: C) 60 Hz
4. The root mean square (RMS) value of an AC voltage is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the peak value
- B) Less than the peak value
- C) Greater than the peak value
- D) Zero
- Answer: B) Less than the peak value
5. The peak value of a sine wave is 100 V. What is the RMS value? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 70.7 V
- B) 50 V
- C) 100 V
- D) 141.4 V
- Answer: A) 70.7 V
6. The phase difference between voltage and current in a purely resistive AC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0 degrees
- B) 45 degrees
- C) 90 degrees
- D) 180 degrees
- Answer: A) 0 degrees
7. In a purely inductive AC circuit, the current: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Leads the voltage by 90 degrees
- B) Lags the voltage by 90 degrees
- C) Is in phase with the voltage
- D) Is out of phase by 180 degrees
- Answer: B) Lags the voltage by 90 degrees
8. In a purely capacitive AC circuit, the current: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Leads the voltage by 90 degrees
- B) Lags the voltage by 90 degrees
- C) Is in phase with the voltage
- D) Is out of phase by 180 degrees
- Answer: A) Leads the voltage by 90 degrees
9. The power factor of a purely resistive circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0
- B) 0.5
- C) 1
- D) Infinity
- Answer: C) 1
10. The power factor of a purely inductive or capacitive circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 0
- B) 0.5
- C) 1
- D) Infinity
- Answer: A) 0
11. The formula for calculating the RMS value of a sinusoidal AC voltage is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) \( V_{\text{peak}} \times \sqrt{2} \)
- B) \( V_{\text{peak}} / \sqrt{2} \)
- C) \( V_{\text{average}} \times \sqrt{2} \)
- D) \( V_{\text{average}} / \sqrt{2} \)
- Answer: B) \( V_{\text{peak}} / \sqrt{2} \)
12. The average value of a pure sinusoidal AC voltage over one complete cycle is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Equal to the RMS value
- B) Zero
- C) Equal to the peak value
- D) Half the peak value
- Answer: B) Zero
13. Impedance in an AC circuit is represented by the symbol: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) R
- B) X
- C) Z
- D) Y
- Answer: C) Z
14. In an AC circuit, impedance (Z) is a combination of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Resistance and inductance
- B) Resistance and capacitance
- C) Inductance and capacitance
- D) Resistance, inductance, and capacitance
- Answer: D) Resistance, inductance, and capacitance
15. The unit of impedance is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Ohm
- B) Farad
- C) Henry
- D) Volt
- Answer: A) Ohm
16. In an AC circuit, the opposition to current flow provided by inductance is called: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Reactance
- B) Resistance
- C) Impedance
- D) Conductance
- Answer: A) Reactance
17. The reactance of a capacitor in an AC circuit is given by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) \( X_C = 2\pi f L \)
- B) \( X_C = \frac{1}{2\pi f C} \)
- C) \( X_C = 2\pi f R \)
- D) \( X_C = \frac{1}{2\pi f L} \)
- Answer: B) \( X_C = \frac{1}{2\pi f C} \)
18. The reactance of an inductor in an AC circuit is given by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) \( X_L = 2\pi f L \)
- B) \( X_L = \frac{1}{2\pi f C} \)
- C) \( X_L = 2\pi f R \)
- D) \( X_L = \frac{1}{2\pi f L} \)
- Answer: A) \( X_L = 2\pi f L \)
19. Power in an AC circuit is given by the formula: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) \( P = VI \)
- B) \( P = VI \cos\theta \)
- C) \( P = V^2 / R \)
- D) \( P = I^2 R \)
- Answer: B) \( P = VI \cos\theta \)
20. The term used to describe the actual power consumed in an AC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Apparent power
- B) Reactive power
- C) Real power
- D) Complex power
- Answer: C) Real power
21. The unit of apparent power in an AC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Watt
- B) Volt-Ampere (VA)
- C) Ohm
- D) Henry
- Answer: B) Volt-Ampere (VA)
22. The unit of reactive power in an AC circuit is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Watt
- B) Volt-Ampere Reactive (VAR)
- C) Ohm
- D) Farad
- Answer: B) Volt-Ampere Reactive (VAR)
23. Which instrument is used to measure the power factor of an AC circuit? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Voltmeter
- B) Ammeter
- C) Wattmeter
- D) Power factor meter
- Answer: D) Power factor meter
24. Harmonics in an AC circuit are: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Higher frequency components of the fundamental frequency
- B) Lower frequency components of the fundamental frequency
- C) Equal frequency components
- D) Zero frequency components
- Answer: A) Higher frequency components of the fundamental frequency
25. A purely resistive load in an AC circuit will have a power factor of:
- A) 0
- B) 0.5
- C) 1
- D) -1
- Answer: C) 1
26. In an AC circuit with inductance and capacitance, resonance occurs when: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Inductive reactance equals capacitive reactance
- B) Inductive reactance is greater than capacitive reactance
- C) Inductive reactance is less than capacitive reactance
- D) There is no reactance
- Answer: A) Inductive reactance equals capacitive reactance
27. The skin effect in AC circuits causes the current to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Flow more on the surface of the conductor
- B) Flow more in the center of the conductor
- C) Be equally distributed throughout the conductor
- D) Flow more in the insulator
- Answer: A) Flow more on the surface of the conductor
28. Power factor correction in AC circuits is typically done using: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Inductors
- B) Resistors
- C) Capacitors
- D) Transformers
- Answer: C) Capacitors
29. The phasor representation of an AC quantity is used to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Measure the magnitude only
- B) Measure the phase only
- C) Represent both magnitude and phase
- D) Represent the DC component
Topic-9 Transformers
Sure! Here are 30 multiple-choice questions (MCQs) on the topic "Transformers," along with their answers:
1. What is the primary function of a transformer? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Convert DC to AC
- B) Convert AC to DC
- C) Change the voltage level
- D) Store electrical energy
- Answer: C) Change the voltage level
2. In a step-up transformer, the secondary voltage is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Less than the primary voltage
- B) Equal to the primary voltage
- C) Greater than the primary voltage
- D) Zero
- Answer: C) Greater than the primary voltage
3. The core of a transformer is typically made of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Aluminum
- B) Copper
- C) Silicon steel
- D) Plastic
- Answer: C) Silicon steel
4. The efficiency of a transformer is usually in the range of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 50-60%
- B) 60-70%
- C) 70-80%
- D) 95-99%
- Answer: D) 95-99%
5. What type of transformer is used to measure high currents? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Potential transformer
- B) Power transformer
- C) Current transformer
- D) Isolation transformer
- Answer: C) Current transformer
6. In a transformer, the windings are made of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Iron
- B) Copper or aluminum
- C) Plastic
- D) Steel
- Answer: B) Copper or aluminum
7. The primary winding of a transformer is connected to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Load
- B) Source of power
- C) Ground
- D) Switch
- Answer: B) Source of power
8. The secondary winding of a transformer is connected to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Load
- B) Source of power
- C) Ground
- D) Switch
- Answer: A) Load
9. Which type of transformer has a 1:1 turns ratio? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Step-up transformer
- B) Step-down transformer
- C) Isolation transformer
- D) Auto-transformer
- Answer: C) Isolation transformer
10. In a transformer, the voltage per turn in the primary and secondary windings is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Different
- B) Zero
- C) Equal
- D) Inversely proportional
- Answer: C) Equal
11. The core of a transformer is laminated to: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Increase eddy current losses
- B) Reduce eddy current losses
- C) Increase mechanical strength
- D) Reduce hysteresis losses
- Answer: B) Reduce eddy current losses
12. What is the purpose of using oil in a transformer? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Lubrication
- B) Insulation and cooling
- C) Reducing weight
- D) Reducing eddy currents
- Answer: B) Insulation and cooling
13. The transformer operates on the principle of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Electrostatics
- B) Electromagnetic induction
- C) Thermodynamics
- D) Photoelectric effect
- Answer: B) Electromagnetic induction
14. Which loss in a transformer is dependent on the load? (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Core loss
- B) Eddy current loss
- C) Hysteresis loss
- D) Copper loss
- Answer: D) Copper loss
15. The ideal transformer has an efficiency of: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) 50%
- B) 75%
- C) 100%
- D) 25%
- Answer: C) 100%
16. The primary and secondary windings in a transformer are linked by: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) Electric field
- B) Magnetic field
- C) Capacitive coupling
- D) Resistive coupling
- Answer: B) Magnetic field
17. The formula for the voltage transformation ratio of a transformer is: (pspcl electrician book pspcl electrician test series Punjab electrician book Punjab electrician test series)
- A) \( \frac{V_p}{V_s} = \frac{N_p}{N_s} \)
- B) \( \frac{V_p}{V_s} = \frac{I_p}{I_s} \)
- C) \( \frac{V_p}{V_s} = \frac{R_p}{R_s} \)
- D) \( \frac{V_p}{V_s} = \frac{P_p}{P_s} \)
- Answer: A) \( \frac{V_p}{V_s} = \frac{N_p}{N_s} \)
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