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Psssb je Electrical Book And Test Series 7000+ mcq (apnitest.in)
1. What does the armature of a DC machine consist of?(PSSSB JE ELECTRICAL BOOK)
a) Copper coils
b) Iron core with coils
c) Steel laminations
d) Permanent magnets
Answer: b) Iron core with coils
2. The commutator in a DC machine is used to(PSSSB JE ELECTRICAL BOOK)
a) Increase efficiency
b) Reverse the direction of current
c) Reduce losses
d) Maintain constant voltage
Answer: b) Reverse the direction of current
3. 
4. In a DC motor, the function of the field winding is to(PSSSB JE ELECTRICAL BOOK)
a) Generate torque
b) Provide mechanical energy
c) Create a magnetic field
d) Produce electricity
Answer: c) Create a magnetic field
5. 
4. What is the primary purpose of the brush in a DC machine? (PSSSB JE ELECTRICAL BOOK)
a) To increase voltage
b) To transfer electrical current to the commutator
c) To maintain the speed of the motor
d) To reduce mechanical friction
Answer: b) To transfer electrical current to the commutator
6. Which of the following is true about a DC motor? (PSSSB JE ELECTRICAL BOOK)
a) It works on the principle of electromagnetic induction
b) The direction of rotation cannot be reversed
c) It operates on direct current only
d) It operates efficiently at high frequencies
Answer: c) It operates on direct current only
7. The speed of a DC motor is inversely proportional to(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance
b) The field current
c) The back EMF
d) The armature current
Answer: b) The field current
8. In a DC generator, the function of the armature winding is to(PSSSB JE ELECTRICAL BOOK)
a) Produce mechanical energy
b) Generate electrical power
c) Provide a magnetic field
d) Rotate the field poles
Answer: b) Generate electrical power
9. What is the significance of the commutator in a DC generator? (PSSSB JE ELECTRICAL BOOK)
a) To convert mechanical energy into electrical energy
b) To reverse the direction of current in the armature
c) To adjust the load current
d) To reduce the loss of energy
Answer: b) To reverse the direction of current in the armature
10. The efficiency of a DC machine depends on(PSSSB JE ELECTRICAL BOOK)
a) The load current
b) The size of the machine
c) The speed of the motor
d) The type of materials used
Answer: a) The load current
11. The field winding in a DC motor is placed on the(PSSSB JE ELECTRICAL BOOK)
a) Armature
b) Shaft
c) Poles
d) Commutator
Answer: c) Poles
12. A shunt-wound DC motor has a(PSSSB JE ELECTRICAL BOOK)
a) Low starting torque
b) High starting torque
c) Medium starting torque
d) No starting torque
Answer: a) Low starting torque
13. In a series-wound DC motor, the field winding is connected in(PSSSB JE ELECTRICAL BOOK)
a) Parallel to the armature
b) Series with the armature
c) Parallel to the stator
d) Separate from the armature
Answer: b) Series with the armature
14. The back EMF (Electromotive Force) in a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Directly proportional to the armature current
b) Inversely proportional to the speed of the motor
c) Zero when the motor is running
d) Produced by the rotating armature
Answer: d) Produced by the rotating armature
15. A DC motor will not start if(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance is too low
b) The field current is too high
c) The commutator is short-circuited
d) The brushes are worn out
Answer: b) The field current is too high
16. In a DC generator, the induced voltage depends on the(PSSSB JE ELECTRICAL BOOK)
a) Speed of rotation of the armature
b) Size of the commutator
c) Length of the armature windings
d) Material of the armature
Answer: a) Speed of rotation of the armature
17. The direction of rotation of a DC motor can be reversed by(PSSSB JE ELECTRICAL BOOK)
a) Reversing the field current
b) Reversing the armature current
c) Reversing the supply voltage
d) All of the above
Answer: d) All of the above
18. The main advantage of a separately excited DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Higher efficiency
b) High starting torque
c) Better control of speed
d) Low maintenance cost
Answer: c) Better control of speed
19. Which of the following is NOT a type of DC motor? (PSSSB JE ELECTRICAL BOOK)
a) Shunt motor
b) Series motor
c) Synchronous motor
d) Compound motor
Answer: c) Synchronous motor
20. In a DC motor, torque is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) Armature current and field flux
b) Voltage applied to the motor
c) Field current and speed
d) Armature resistance
Answer: a) Armature current and field flux
21. The main advantage of a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) High starting torque
b) Low maintenance
c) Constant speed operation
d) High efficiency
Answer: a) High starting torque
22. In a DC machine, the function of the pole shoes is to(PSSSB JE ELECTRICAL BOOK)
a) Direct the magnetic flux to the armature
b) Support the field windings
c) Reduce armature reaction
d) All of the above
Answer: d) All of the above
23. The efficiency of a DC motor increases with an increase in(PSSSB JE ELECTRICAL BOOK)
a) Field current
b) Armature resistance
c) Load current
d) Commutator speed
Answer: c) Load current
24. In a DC motor, the term "field flux" refers to(PSSSB JE ELECTRICAL BOOK)
a) The total current in the armature
b) The current flowing through the field winding
c) The magnetic field generated by the field winding
d) The back EMF generated in the motor
Answer: c) The magnetic field generated by the field winding
25. The main disadvantage of a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) It is more expensive than an AC motor
b) It requires frequent maintenance
c) It has low efficiency
d) It cannot be used for high-speed operations
Answer: b) It requires frequent maintenance
26. In a compound-wound DC motor, the field windings are connected in(PSSSB JE ELECTRICAL BOOK)
a) Series with the armature
b) Parallel with the armature
c) Both series and parallel
d) None of the above
Answer: c) Both series and parallel
27. The induced voltage in the armature of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The square of the flux
b) The speed of rotation of the armature
c) The field current
d) The resistance of the armature
Answer: b) The speed of rotation of the armature
28. The major difference between a DC motor and a DC generator is(PSSSB JE ELECTRICAL BOOK)
a) The DC motor uses mechanical energy to produce electrical energy
b) The DC generator uses electrical energy to produce mechanical energy
c) The DC motor has a commutator, while the generator does not
d) The DC motor has a lower operating speed than a generator
Answer: a) The DC motor uses mechanical energy to produce electrical energy
29. The back EMF in a DC motor is proportional to(PSSSB JE ELECTRICAL BOOK)
a) Armature voltage
b) Speed of rotation
c) Current flowing through the motor
d) Magnetic field strength
Answer: b) Speed of rotation
30. In a separately excited DC motor, the field winding is fed from(PSSSB JE ELECTRICAL BOOK)
a) A battery
b) The same source as the armature
c) A different external source
d) The commutator
Answer: c) A different external source
31. The polarity of the generated voltage in a DC generator depends on(PSSSB JE ELECTRICAL BOOK)
a) The direction of the magnetic field
b) The speed of rotation
c) The direction of current through the armature
d) All of the above
Answer: d) All of the above
32. The function of the armature in a DC motor is to(PSSSB JE ELECTRICAL BOOK)
a) Create a magnetic field
b) Convert electrical energy into mechanical energy
c) Reverse the direction of current
d) Maintain constant speed
Answer: b) Convert electrical energy into mechanical energy
33. The efficiency of a DC generator is affected by(PSSSB JE ELECTRICAL BOOK)
a) The load current
b) The material of the armature
c) The speed at which the armature rotates
d) All of the above
Answer: d) All of the above
34. A DC machine that operates as a motor has(PSSSB JE ELECTRICAL BOOK)
a) A rotating magnetic field
b) A stationary armature
c) An electromotive force in the stator
d) Mechanical energy converted to electrical energy
Answer: a) A rotating magnetic field
35. The flux produced in a DC machine is dependent on(PSSSB JE ELECTRICAL BOOK)
a) The amount of current in the armature
b) The strength of the field current
c) The temperature of the motor
d) The rotational speed of the armature
Answer: b) The strength of the field current
35. In a DC generator, the armature reaction causes(PSSSB JE ELECTRICAL BOOK)
a) An increase in voltage
b) A reduction in efficiency
c) The magnetic flux to distort
d) The commutator to spark
Answer: c) The magnetic flux to distort
36. The speed of a DC motor can be controlled by adjusting(PSSSB JE ELECTRICAL BOOK)
a) The supply voltage
b) The field current
c) The armature current
d) All of the above
Answer: d) All of the above
37. The power output of a DC generator is(PSSSB JE ELECTRICAL BOOK)
a) Equal to the input mechanical power
b) Less than the input mechanical power
c) Greater than the input mechanical power
d) Zero
Answer: b) Less than the input mechanical power
38. Which of the following components in a DC motor is responsible for converting the mechanical energy to electrical energy? (PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Armature
c) Field windings
d) Shaft
Answer: b) Armature
39. The armature winding in a DC machine is responsible for(PSSSB JE ELECTRICAL BOOK)
a) Generating the magnetic field
b) Supporting the field windings
c) Creating a path for current to flow
d) None of the above
Answer: c) Creating a path for current to flow
40. The total voltage generated by a DC generator depends on(PSSSB JE ELECTRICAL BOOK)
a) The number of coils in the armature
b) The speed of the armature rotation
c) The strength of the magnetic field
d) All of the above
Answer: d) All of the above
41. In a DC motor, if the field current is increased, the motor will(PSSSB JE ELECTRICAL BOOK)
a) Run faster
b) Run slower
c) Maintain constant speed
d) Stop functioning
Answer: b) Run slower
42. The main disadvantage of a shunt-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) It has low efficiency
b) It has a low starting torque
c) It requires more maintenance
d) It cannot be used at high speeds
Answer: b) It has a low starting torque
43. A compound-wound DC motor has(PSSSB JE ELECTRICAL BOOK)
a) Both series and shunt field windings
b) Only a shunt field winding
c) Only a series field winding
d) No field winding
Answer: a) Both series and shunt field windings
44. In a DC motor, what happens if the armature current is too high? (PSSSB JE ELECTRICAL BOOK)
a) The motor runs at higher speeds
b) The motor may overheat
c) The motor generates more torque
d) The motor’s efficiency increases
Answer: b) The motor may overheat
45. The voltage in a DC generator can be increased by(PSSSB JE ELECTRICAL BOOK)
a) Increasing the field current
b) Decreasing the speed of the armature
c) Reducing the load
d) Decreasing the number of armature coils
Answer: a) Increasing the field current
46. The efficiency of a DC machine decreases if(PSSSB JE ELECTRICAL BOOK)
a) The speed increases
b) The load increases
c) The resistance of the armature increases
d) The field current increases
Answer: c) The resistance of the armature increases
47. A DC motor operates based on the principle of(PSSSB JE ELECTRICAL BOOK)
a) Faraday's Law of Induction
b) Lenz's Law
c) Fleming’s Left Hand Rule
d) Fleming’s Right Hand Rule
Answer: c) Fleming’s Left Hand Rule
48. The field windings in a DC motor are generally made of(PSSSB JE ELECTRICAL BOOK)
a) Aluminum wire
b) Copper wire
c) Steel wire
d) Iron wire
Answer: b) Copper wire
49. A common application for a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) In high-speed applications
b) In applications where high starting torque is needed
c) In low-power applications
d) In constant-speed applications
Answer: b) In applications where high starting torque is needed
50. The current that flows in the armature of a DC motor is caused by(PSSSB JE ELECTRICAL BOOK)
a) The back EMF
b) The field current
c) The external load
d) The supply voltage
Answer: d) The supply voltage
51. The commutator in a DC generator serves to(PSSSB JE ELECTRICAL BOOK)
a) Reverse the direction of the armature current
b) Improve the efficiency of the machine
c) Maintain constant speed
d) Reduce armature resistance
Answer: a) Reverse the direction of the armature current
52. The mechanical energy output of a DC motor is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The supply voltage
b) The armature resistance
c) The speed of rotation
d) The torque developed
Answer: d) The torque developed
53. The field flux in a DC motor can be controlled by(PSSSB JE ELECTRICAL BOOK)
a) Adjusting the field winding resistance
b) Changing the supply voltage
c) Increasing the speed
d) Adjusting the armature current
Answer: a) Adjusting the field winding resistance
54. A dynamo is another name for a(PSSSB JE ELECTRICAL BOOK)
a) DC motor
b) DC generator
c) Transformer
d) Alternator
Answer: b) DC generator
55. The armature reaction in a DC motor results in(PSSSB JE ELECTRICAL BOOK)
a) Increased torque
b) Decreased efficiency
c) Distortion of the magnetic field
d) Higher starting current
Answer: c) Distortion of the magnetic field
56. In a DC machine, the speed of rotation is mainly influenced by(PSSSB JE ELECTRICAL BOOK)
a) The applied voltage
b) The load current
c) The field strength
d) The armature resistance
Answer: a) The applied voltage
57. A DC motor with high armature resistance will have(PSSSB JE ELECTRICAL BOOK)
a) High efficiency
b) Low efficiency
c) High torque
d) Low speed
Answer: b) Low efficiency
58. The torque in a DC motor is maximum when(PSSSB JE ELECTRICAL BOOK)
a) The motor is at full speed
b) The armature current is at its lowest
c) The field current is at its highest
d) The back EMF is low
Answer: d) The back EMF is low
59. The most common method to reverse the direction of a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Reversing the polarity of the field current
b) Reversing the armature current
c) Increasing the voltage supply
d) Changing the armature winding
Answer: a) Reversing the polarity of the field current
60. The efficiency of a DC generator is dependent on the(PSSSB JE ELECTRICAL BOOK)
a) Speed of the armature
b) Load connected to the generator
c) Size of the armature windings
d) Type of field winding used
Answer: b) Load connected to the generator
61. In a shunt-wound DC motor, the field winding is connected(PSSSB JE ELECTRICAL BOOK)
a) In parallel with the armature
b) In series with the armature
c) In parallel with the load
d) In parallel with the supply voltage
Answer: a) In parallel with the armature
62. The power loss in a DC machine is mainly caused by(PSSSB JE ELECTRICAL BOOK)
a) Heat produced by the field windings
b) Friction between the brushes and the commutator
c) Eddy currents in the armature
d) All of the above
Answer: d) All of the above
63. In a DC machine, the armature winding is connected to the commutator to(PSSSB JE ELECTRICAL BOOK)
a) Provide electrical contact to the external circuit
b) Increase the speed
c) Regulate the armature current
d) Reduce mechanical loss
Answer: a) Provide electrical contact to the external circuit
64. The construction of a DC motor does not include(PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Field windings
c) Rotor blades
d) Armature
Answer: c) Rotor blades
65. The field winding in a DC motor is placed on the(PSSSB JE ELECTRICAL BOOK)
a) Armature
b) Shaft
c) Poles
d) Commutator
Answer: c) Poles
66. The total voltage generated in a DC machine is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The number of armature coils
b) The speed of the armature
c) The length of the armature winding
d) The resistance of the field windings
Answer: b) The speed of the armature
67. The armature reaction in a DC machine affects(PSSSB JE ELECTRICAL BOOK)
a) Efficiency
b) Speed
c) Voltage regulation
d) Armature current
Answer: c) Voltage regulation
68. The purpose of the commutator in a DC motor is to(PSSSB JE ELECTRICAL BOOK)
a) Increase the speed
b) Reduce losses
c) Convert AC to DC
d) Maintain constant voltage
Answer: c) Convert AC to DC
69. A field winding in a separately excited DC motor is connected(PSSSB JE ELECTRICAL BOOK)
a) In parallel with the armature
b) In series with the armature
c) To a separate external source
d) To the same supply voltage as the armature
Answer: c) To a separate external source
70. The torque produced by a DC motor is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The square of the field flux
b) The armature current
c) The speed of rotation
d) The input power
Answer: b) The armature current
71. The most common type of DC motor used in applications requiring high starting torque is a(PSSSB JE ELECTRICAL BOOK)
a) Shunt-wound motor
b) Series-wound motor
c) Compound-wound motor
d) Permanent magnet motor
Answer: b) Series-wound motor
72. The efficiency of a DC motor can be improved by(PSSSB JE ELECTRICAL BOOK)
a) Reducing the armature resistance
b) Increasing the field current
c) Increasing the supply voltage
d) Decreasing the load current
Answer: a) Reducing the armature resistance
73. The total resistance in the armature circuit of a DC motor consists of(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance only
b) The field winding resistance only
c) The combined resistance of the armature and field winding
d) The brush resistance only
Answer: a) The armature resistance only
74. In a compound-wound DC motor, the field windings are(PSSSB JE ELECTRICAL BOOK)
a) Connected in series with the armature
b) Connected in parallel with the armature
c) Both series and parallel connected
d) Connected in parallel with the load
Answer: c) Both series and parallel connected
75. The direction of rotation of a DC motor is controlled by(PSSSB JE ELECTRICAL BOOK)
a) Reversing the armature current
b) Changing the supply frequency
c) Changing the field flux
d) All of the above
Answer: d) All of the above
76. The back EMF in a DC motor is generated by(PSSSB JE ELECTRICAL BOOK)
a) The mechanical motion of the armature
b) The commutator
c) The external load
d) The interaction between the field flux and armature windings
Answer: d) The interaction between the field flux and armature windings
77. The armature reaction in a DC machine is caused by(PSSSB JE ELECTRICAL BOOK)
a) The armature current and the magnetic field
b) The commutator sparking
c) The mechanical loss in the motor
d) The change in field flux
Answer: a) The armature current and the magnetic field
78. The efficiency of a DC generator decreases as(PSSSB JE ELECTRICAL BOOK)
a) The speed increases
b) The load increases
c) The field current decreases
d) The armature current decreases
Answer: b) The load increases
79. The maximum voltage that can be induced in the armature of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance
b) The speed of rotation
c) The magnetic flux
d) The back EMF
Answer: b) The speed of rotation
80. The purpose of the pole pieces in a DC machine is to(PSSSB JE ELECTRICAL BOOK)
a) Carry the armature current
b) Provide support for the field windings
c) Guide the magnetic field lines to the armature
d) Control the speed of the motor
Answer: c) Guide the magnetic field lines to the armature
81. The armature of a DC machine is typically made of(PSSSB JE ELECTRICAL BOOK)
a) Steel
b) Copper
c) Aluminum
d) Iron
Answer: d) Iron
82. Which of the following is a feature of a series-wound DC motor? (PSSSB JE ELECTRICAL BOOK)
a) It provides constant speed under varying loads
b) It has a high starting torque
c) It is ideal for precision speed control
d) It is used in low-speed applications
Answer: b) It has a high starting torque
83. In a compound-wound DC motor, the series field winding provides(PSSSB JE ELECTRICAL BOOK)
a) High starting torque
b) Increased efficiency
c) Constant speed
d) Higher voltage output
Answer: a) High starting torque
84. The main disadvantage of a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Low starting torque
b) It is sensitive to load fluctuations
c) High maintenance
d) It cannot be used in high-power applications
Answer: b) It is sensitive to load fluctuations
85. The primary application of a shunt-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) High-speed applications
b) Constant speed applications
c) Low-speed applications
d) High-torque applications
Answer: b) Constant speed applications
86. The armature winding in a DC motor is typically connected to the(PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Shaft
c) Field poles
d) Brushes
Answer: a) Commutator
87. A compound-wound DC motor is commonly used in(PSSSB JE ELECTRICAL BOOK)
a) Fans and pumps
b) High-precision control systems
c) Applications requiring high-speed operation
d) Lifts and cranes
Answer: d) Lifts and cranes
88. The speed of a DC motor increases when(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance increases
b) The field current decreases
c) The load on the motor decreases
d) Both b and c
Answer: d) Both b and c
89. The power factor in a DC motor can be improved by(PSSSB JE ELECTRICAL BOOK)
a) Increasing the armature current
b) Decreasing the back EMF
c) Improving the efficiency of the commutator
d) Increasing the field current
Answer: c) Improving the efficiency of the commutator
90. The commutator in a DC motor converts(PSSSB JE ELECTRICAL BOOK)
a) AC to DC
b) DC to AC
c) Electrical energy to mechanical energy
d) Mechanical energy to electrical energy
Answer: a) AC to DC
91. In a DC motor, the torque is maximized when(PSSSB JE ELECTRICAL BOOK)
a) The back EMF is at its highest
b) The armature current is at its lowest
c) The armature current is at its highest
d) The field current is zero
Answer: c) The armature current is at its highest
92. In a shunt-wound DC motor, if the load increases, the speed(PSSSB JE ELECTRICAL BOOK)
a) Increases
b) Decreases
c) Remains constant
d) Becomes unpredictable
Answer: b) Decreases
93. The voltage output of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The number of conductors in the armature
b) The number of turns in the armature windings
c) The speed of rotation and the magnetic flux
d) The field current only
Answer: c) The speed of rotation and the magnetic flux
94. The field flux in a DC machine is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The speed of the armature
b) The load current
c) The field current
d) The armature resistance
Answer: c) The field current
95. A DC motor running without a load will eventually(PSSSB JE ELECTRICAL BOOK)
a) Stop due to lack of torque
b) Run at a constant speed
c) Increase speed until damage occurs
d) Reduce speed automatically
Answer: c) Increase speed until damage occurs
96. In a DC generator, which of the following factors can increase the output voltage? (PSSSB JE ELECTRICAL BOOK)
a) Increasing the resistance of the armature
b) Decreasing the speed of rotation
c) Increasing the number of coils in the armature
d) Decreasing the field current
Answer: c) Increasing the number of coils in the armature
97. The efficiency of a DC generator is highest when(PSSSB JE ELECTRICAL BOOK)
a) The armature is overloaded
b) The speed of rotation is optimal
c) The field current is at maximum
d) The armature resistance is at its lowest
Answer: b) The speed of rotation is optimal
98. The primary cause of energy loss in a DC machine is(PSSSB JE ELECTRICAL BOOK)
a) The resistance of the armature winding
b) The speed of rotation
c) The size of the commutator
d) The field current
Answer: a) The resistance of the armature winding
99. The torque developed in a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Inversely proportional to the armature current
b) Directly proportional to the field current
c) Directly proportional to the armature current and the field flux
d) Independent of the armature current
Answer: c) Directly proportional to the armature current and the field flux
100. A DC motor operating at no load will have a(PSSSB JE ELECTRICAL BOOK)
a) High back EMF
b) Low back EMF
c) High armature current
d) Low speed
Answer: a) High back EMF
1. What does the armature of a DC machine consist of?(PSSSB JE ELECTRICAL BOOK)
a) Copper coils
b) Iron core with coils
c) Steel laminations
d) Permanent magnets
Answer: b) Iron core with coils
2. The commutator in a DC machine is used to(PSSSB JE ELECTRICAL BOOK)
a) Increase efficiency
b) Reverse the direction of current
c) Reduce losses
d) Maintain constant voltage
Answer: b) Reverse the direction of current
3.
4. In a DC motor, the function of the field winding is to(PSSSB JE ELECTRICAL BOOK)
a) Generate torque
b) Provide mechanical energy
c) Create a magnetic field
d) Produce electricity
Answer: c) Create a magnetic field
5.
4. What is the primary purpose of the brush in a DC machine? (PSSSB JE ELECTRICAL BOOK)
a) To increase voltage
b) To transfer electrical current to the commutator
c) To maintain the speed of the motor
d) To reduce mechanical friction
Answer: b) To transfer electrical current to the commutator
6. Which of the following is true about a DC motor? (PSSSB JE ELECTRICAL BOOK)
a) It works on the principle of electromagnetic induction
b) The direction of rotation cannot be reversed
c) It operates on direct current only
d) It operates efficiently at high frequencies
Answer: c) It operates on direct current only
7. The speed of a DC motor is inversely proportional to(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance
b) The field current
c) The back EMF
d) The armature current
Answer: b) The field current
8. In a DC generator, the function of the armature winding is to(PSSSB JE ELECTRICAL BOOK)
a) Produce mechanical energy
b) Generate electrical power
c) Provide a magnetic field
d) Rotate the field poles
Answer: b) Generate electrical power
9. What is the significance of the commutator in a DC generator? (PSSSB JE ELECTRICAL BOOK)
a) To convert mechanical energy into electrical energy
b) To reverse the direction of current in the armature
c) To adjust the load current
d) To reduce the loss of energy
Answer: b) To reverse the direction of current in the armature
10. The efficiency of a DC machine depends on(PSSSB JE ELECTRICAL BOOK)
a) The load current
b) The size of the machine
c) The speed of the motor
d) The type of materials used
Answer: a) The load current
11. The field winding in a DC motor is placed on the(PSSSB JE ELECTRICAL BOOK)
a) Armature
b) Shaft
c) Poles
d) Commutator
Answer: c) Poles
12. A shunt-wound DC motor has a(PSSSB JE ELECTRICAL BOOK)
a) Low starting torque
b) High starting torque
c) Medium starting torque
d) No starting torque
Answer: a) Low starting torque
13. In a series-wound DC motor, the field winding is connected in(PSSSB JE ELECTRICAL BOOK)
a) Parallel to the armature
b) Series with the armature
c) Parallel to the stator
d) Separate from the armature
Answer: b) Series with the armature
14. The back EMF (Electromotive Force) in a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Directly proportional to the armature current
b) Inversely proportional to the speed of the motor
c) Zero when the motor is running
d) Produced by the rotating armature
Answer: d) Produced by the rotating armature
15. A DC motor will not start if(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance is too low
b) The field current is too high
c) The commutator is short-circuited
d) The brushes are worn out
Answer: b) The field current is too high
16. In a DC generator, the induced voltage depends on the(PSSSB JE ELECTRICAL BOOK)
a) Speed of rotation of the armature
b) Size of the commutator
c) Length of the armature windings
d) Material of the armature
Answer: a) Speed of rotation of the armature
17. The direction of rotation of a DC motor can be reversed by(PSSSB JE ELECTRICAL BOOK)
a) Reversing the field current
b) Reversing the armature current
c) Reversing the supply voltage
d) All of the above
Answer: d) All of the above
18. The main advantage of a separately excited DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Higher efficiency
b) High starting torque
c) Better control of speed
d) Low maintenance cost
Answer: c) Better control of speed
19. Which of the following is NOT a type of DC motor? (PSSSB JE ELECTRICAL BOOK)
a) Shunt motor
b) Series motor
c) Synchronous motor
d) Compound motor
Answer: c) Synchronous motor
20. In a DC motor, torque is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) Armature current and field flux
b) Voltage applied to the motor
c) Field current and speed
d) Armature resistance
Answer: a) Armature current and field flux
21. The main advantage of a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) High starting torque
b) Low maintenance
c) Constant speed operation
d) High efficiency
Answer: a) High starting torque
22. In a DC machine, the function of the pole shoes is to(PSSSB JE ELECTRICAL BOOK)
a) Direct the magnetic flux to the armature
b) Support the field windings
c) Reduce armature reaction
d) All of the above
Answer: d) All of the above
23. The efficiency of a DC motor increases with an increase in(PSSSB JE ELECTRICAL BOOK)
a) Field current
b) Armature resistance
c) Load current
d) Commutator speed
Answer: c) Load current
24. In a DC motor, the term "field flux" refers to(PSSSB JE ELECTRICAL BOOK)
a) The total current in the armature
b) The current flowing through the field winding
c) The magnetic field generated by the field winding
d) The back EMF generated in the motor
Answer: c) The magnetic field generated by the field winding
25. The main disadvantage of a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) It is more expensive than an AC motor
b) It requires frequent maintenance
c) It has low efficiency
d) It cannot be used for high-speed operations
Answer: b) It requires frequent maintenance
26. In a compound-wound DC motor, the field windings are connected in(PSSSB JE ELECTRICAL BOOK)
a) Series with the armature
b) Parallel with the armature
c) Both series and parallel
d) None of the above
Answer: c) Both series and parallel
27. The induced voltage in the armature of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The square of the flux
b) The speed of rotation of the armature
c) The field current
d) The resistance of the armature
Answer: b) The speed of rotation of the armature
28. The major difference between a DC motor and a DC generator is(PSSSB JE ELECTRICAL BOOK)
a) The DC motor uses mechanical energy to produce electrical energy
b) The DC generator uses electrical energy to produce mechanical energy
c) The DC motor has a commutator, while the generator does not
d) The DC motor has a lower operating speed than a generator
Answer: a) The DC motor uses mechanical energy to produce electrical energy
29. The back EMF in a DC motor is proportional to(PSSSB JE ELECTRICAL BOOK)
a) Armature voltage
b) Speed of rotation
c) Current flowing through the motor
d) Magnetic field strength
Answer: b) Speed of rotation
30. In a separately excited DC motor, the field winding is fed from(PSSSB JE ELECTRICAL BOOK)
a) A battery
b) The same source as the armature
c) A different external source
d) The commutator
Answer: c) A different external source
31. The polarity of the generated voltage in a DC generator depends on(PSSSB JE ELECTRICAL BOOK)
a) The direction of the magnetic field
b) The speed of rotation
c) The direction of current through the armature
d) All of the above
Answer: d) All of the above
32. The function of the armature in a DC motor is to(PSSSB JE ELECTRICAL BOOK)
a) Create a magnetic field
b) Convert electrical energy into mechanical energy
c) Reverse the direction of current
d) Maintain constant speed
Answer: b) Convert electrical energy into mechanical energy
33. The efficiency of a DC generator is affected by(PSSSB JE ELECTRICAL BOOK)
a) The load current
b) The material of the armature
c) The speed at which the armature rotates
d) All of the above
Answer: d) All of the above
34. A DC machine that operates as a motor has(PSSSB JE ELECTRICAL BOOK)
a) A rotating magnetic field
b) A stationary armature
c) An electromotive force in the stator
d) Mechanical energy converted to electrical energy
Answer: a) A rotating magnetic field
35. The flux produced in a DC machine is dependent on(PSSSB JE ELECTRICAL BOOK)
a) The amount of current in the armature
b) The strength of the field current
c) The temperature of the motor
d) The rotational speed of the armature
Answer: b) The strength of the field current
35. In a DC generator, the armature reaction causes(PSSSB JE ELECTRICAL BOOK)
a) An increase in voltage
b) A reduction in efficiency
c) The magnetic flux to distort
d) The commutator to spark
Answer: c) The magnetic flux to distort
36. The speed of a DC motor can be controlled by adjusting(PSSSB JE ELECTRICAL BOOK)
a) The supply voltage
b) The field current
c) The armature current
d) All of the above
Answer: d) All of the above
37. The power output of a DC generator is(PSSSB JE ELECTRICAL BOOK)
a) Equal to the input mechanical power
b) Less than the input mechanical power
c) Greater than the input mechanical power
d) Zero
Answer: b) Less than the input mechanical power
38. Which of the following components in a DC motor is responsible for converting the mechanical energy to electrical energy? (PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Armature
c) Field windings
d) Shaft
Answer: b) Armature
39. The armature winding in a DC machine is responsible for(PSSSB JE ELECTRICAL BOOK)
a) Generating the magnetic field
b) Supporting the field windings
c) Creating a path for current to flow
d) None of the above
Answer: c) Creating a path for current to flow
40. The total voltage generated by a DC generator depends on(PSSSB JE ELECTRICAL BOOK)
a) The number of coils in the armature
b) The speed of the armature rotation
c) The strength of the magnetic field
d) All of the above
Answer: d) All of the above
41. In a DC motor, if the field current is increased, the motor will(PSSSB JE ELECTRICAL BOOK)
a) Run faster
b) Run slower
c) Maintain constant speed
d) Stop functioning
Answer: b) Run slower
42. The main disadvantage of a shunt-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) It has low efficiency
b) It has a low starting torque
c) It requires more maintenance
d) It cannot be used at high speeds
Answer: b) It has a low starting torque
43. A compound-wound DC motor has(PSSSB JE ELECTRICAL BOOK)
a) Both series and shunt field windings
b) Only a shunt field winding
c) Only a series field winding
d) No field winding
Answer: a) Both series and shunt field windings
44. In a DC motor, what happens if the armature current is too high? (PSSSB JE ELECTRICAL BOOK)
a) The motor runs at higher speeds
b) The motor may overheat
c) The motor generates more torque
d) The motor’s efficiency increases
Answer: b) The motor may overheat
45. The voltage in a DC generator can be increased by(PSSSB JE ELECTRICAL BOOK)
a) Increasing the field current
b) Decreasing the speed of the armature
c) Reducing the load
d) Decreasing the number of armature coils
Answer: a) Increasing the field current
46. The efficiency of a DC machine decreases if(PSSSB JE ELECTRICAL BOOK)
a) The speed increases
b) The load increases
c) The resistance of the armature increases
d) The field current increases
Answer: c) The resistance of the armature increases
47. A DC motor operates based on the principle of(PSSSB JE ELECTRICAL BOOK)
a) Faraday's Law of Induction
b) Lenz's Law
c) Fleming’s Left Hand Rule
d) Fleming’s Right Hand Rule
Answer: c) Fleming’s Left Hand Rule
48. The field windings in a DC motor are generally made of(PSSSB JE ELECTRICAL BOOK)
a) Aluminum wire
b) Copper wire
c) Steel wire
d) Iron wire
Answer: b) Copper wire
49. A common application for a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) In high-speed applications
b) In applications where high starting torque is needed
c) In low-power applications
d) In constant-speed applications
Answer: b) In applications where high starting torque is needed
50. The current that flows in the armature of a DC motor is caused by(PSSSB JE ELECTRICAL BOOK)
a) The back EMF
b) The field current
c) The external load
d) The supply voltage
Answer: d) The supply voltage
51. The commutator in a DC generator serves to(PSSSB JE ELECTRICAL BOOK)
a) Reverse the direction of the armature current
b) Improve the efficiency of the machine
c) Maintain constant speed
d) Reduce armature resistance
Answer: a) Reverse the direction of the armature current
52. The mechanical energy output of a DC motor is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The supply voltage
b) The armature resistance
c) The speed of rotation
d) The torque developed
Answer: d) The torque developed
53. The field flux in a DC motor can be controlled by(PSSSB JE ELECTRICAL BOOK)
a) Adjusting the field winding resistance
b) Changing the supply voltage
c) Increasing the speed
d) Adjusting the armature current
Answer: a) Adjusting the field winding resistance
54. A dynamo is another name for a(PSSSB JE ELECTRICAL BOOK)
a) DC motor
b) DC generator
c) Transformer
d) Alternator
Answer: b) DC generator
55. The armature reaction in a DC motor results in(PSSSB JE ELECTRICAL BOOK)
a) Increased torque
b) Decreased efficiency
c) Distortion of the magnetic field
d) Higher starting current
Answer: c) Distortion of the magnetic field
56. In a DC machine, the speed of rotation is mainly influenced by(PSSSB JE ELECTRICAL BOOK)
a) The applied voltage
b) The load current
c) The field strength
d) The armature resistance
Answer: a) The applied voltage
57. A DC motor with high armature resistance will have(PSSSB JE ELECTRICAL BOOK)
a) High efficiency
b) Low efficiency
c) High torque
d) Low speed
Answer: b) Low efficiency
58. The torque in a DC motor is maximum when(PSSSB JE ELECTRICAL BOOK)
a) The motor is at full speed
b) The armature current is at its lowest
c) The field current is at its highest
d) The back EMF is low
Answer: d) The back EMF is low
59. The most common method to reverse the direction of a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Reversing the polarity of the field current
b) Reversing the armature current
c) Increasing the voltage supply
d) Changing the armature winding
Answer: a) Reversing the polarity of the field current
60. The efficiency of a DC generator is dependent on the(PSSSB JE ELECTRICAL BOOK)
a) Speed of the armature
b) Load connected to the generator
c) Size of the armature windings
d) Type of field winding used
Answer: b) Load connected to the generator
61. In a shunt-wound DC motor, the field winding is connected(PSSSB JE ELECTRICAL BOOK)
a) In parallel with the armature
b) In series with the armature
c) In parallel with the load
d) In parallel with the supply voltage
Answer: a) In parallel with the armature
62. The power loss in a DC machine is mainly caused by(PSSSB JE ELECTRICAL BOOK)
a) Heat produced by the field windings
b) Friction between the brushes and the commutator
c) Eddy currents in the armature
d) All of the above
Answer: d) All of the above
63. In a DC machine, the armature winding is connected to the commutator to(PSSSB JE ELECTRICAL BOOK)
a) Provide electrical contact to the external circuit
b) Increase the speed
c) Regulate the armature current
d) Reduce mechanical loss
Answer: a) Provide electrical contact to the external circuit
64. The construction of a DC motor does not include(PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Field windings
c) Rotor blades
d) Armature
Answer: c) Rotor blades
65. The field winding in a DC motor is placed on the(PSSSB JE ELECTRICAL BOOK)
a) Armature
b) Shaft
c) Poles
d) Commutator
Answer: c) Poles
66. The total voltage generated in a DC machine is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The number of armature coils
b) The speed of the armature
c) The length of the armature winding
d) The resistance of the field windings
Answer: b) The speed of the armature
67. The armature reaction in a DC machine affects(PSSSB JE ELECTRICAL BOOK)
a) Efficiency
b) Speed
c) Voltage regulation
d) Armature current
Answer: c) Voltage regulation
68. The purpose of the commutator in a DC motor is to(PSSSB JE ELECTRICAL BOOK)
a) Increase the speed
b) Reduce losses
c) Convert AC to DC
d) Maintain constant voltage
Answer: c) Convert AC to DC
69. A field winding in a separately excited DC motor is connected(PSSSB JE ELECTRICAL BOOK)
a) In parallel with the armature
b) In series with the armature
c) To a separate external source
d) To the same supply voltage as the armature
Answer: c) To a separate external source
70. The torque produced by a DC motor is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The square of the field flux
b) The armature current
c) The speed of rotation
d) The input power
Answer: b) The armature current
71. The most common type of DC motor used in applications requiring high starting torque is a(PSSSB JE ELECTRICAL BOOK)
a) Shunt-wound motor
b) Series-wound motor
c) Compound-wound motor
d) Permanent magnet motor
Answer: b) Series-wound motor
72. The efficiency of a DC motor can be improved by(PSSSB JE ELECTRICAL BOOK)
a) Reducing the armature resistance
b) Increasing the field current
c) Increasing the supply voltage
d) Decreasing the load current
Answer: a) Reducing the armature resistance
73. The total resistance in the armature circuit of a DC motor consists of(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance only
b) The field winding resistance only
c) The combined resistance of the armature and field winding
d) The brush resistance only
Answer: a) The armature resistance only
74. In a compound-wound DC motor, the field windings are(PSSSB JE ELECTRICAL BOOK)
a) Connected in series with the armature
b) Connected in parallel with the armature
c) Both series and parallel connected
d) Connected in parallel with the load
Answer: c) Both series and parallel connected
75. The direction of rotation of a DC motor is controlled by(PSSSB JE ELECTRICAL BOOK)
a) Reversing the armature current
b) Changing the supply frequency
c) Changing the field flux
d) All of the above
Answer: d) All of the above
76. The back EMF in a DC motor is generated by(PSSSB JE ELECTRICAL BOOK)
a) The mechanical motion of the armature
b) The commutator
c) The external load
d) The interaction between the field flux and armature windings
Answer: d) The interaction between the field flux and armature windings
77. The armature reaction in a DC machine is caused by(PSSSB JE ELECTRICAL BOOK)
a) The armature current and the magnetic field
b) The commutator sparking
c) The mechanical loss in the motor
d) The change in field flux
Answer: a) The armature current and the magnetic field
78. The efficiency of a DC generator decreases as(PSSSB JE ELECTRICAL BOOK)
a) The speed increases
b) The load increases
c) The field current decreases
d) The armature current decreases
Answer: b) The load increases
79. The maximum voltage that can be induced in the armature of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance
b) The speed of rotation
c) The magnetic flux
d) The back EMF
Answer: b) The speed of rotation
80. The purpose of the pole pieces in a DC machine is to(PSSSB JE ELECTRICAL BOOK)
a) Carry the armature current
b) Provide support for the field windings
c) Guide the magnetic field lines to the armature
d) Control the speed of the motor
Answer: c) Guide the magnetic field lines to the armature
81. The armature of a DC machine is typically made of(PSSSB JE ELECTRICAL BOOK)
a) Steel
b) Copper
c) Aluminum
d) Iron
Answer: d) Iron
82. Which of the following is a feature of a series-wound DC motor? (PSSSB JE ELECTRICAL BOOK)
a) It provides constant speed under varying loads
b) It has a high starting torque
c) It is ideal for precision speed control
d) It is used in low-speed applications
Answer: b) It has a high starting torque
83. In a compound-wound DC motor, the series field winding provides(PSSSB JE ELECTRICAL BOOK)
a) High starting torque
b) Increased efficiency
c) Constant speed
d) Higher voltage output
Answer: a) High starting torque
84. The main disadvantage of a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Low starting torque
b) It is sensitive to load fluctuations
c) High maintenance
d) It cannot be used in high-power applications
Answer: b) It is sensitive to load fluctuations
85. The primary application of a shunt-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) High-speed applications
b) Constant speed applications
c) Low-speed applications
d) High-torque applications
Answer: b) Constant speed applications
86. The armature winding in a DC motor is typically connected to the(PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Shaft
c) Field poles
d) Brushes
Answer: a) Commutator
87. A compound-wound DC motor is commonly used in(PSSSB JE ELECTRICAL BOOK)
a) Fans and pumps
b) High-precision control systems
c) Applications requiring high-speed operation
d) Lifts and cranes
Answer: d) Lifts and cranes
88. The speed of a DC motor increases when(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance increases
b) The field current decreases
c) The load on the motor decreases
d) Both b and c
Answer: d) Both b and c
89. The power factor in a DC motor can be improved by(PSSSB JE ELECTRICAL BOOK)
a) Increasing the armature current
b) Decreasing the back EMF
c) Improving the efficiency of the commutator
d) Increasing the field current
Answer: c) Improving the efficiency of the commutator
90. The commutator in a DC motor converts(PSSSB JE ELECTRICAL BOOK)
a) AC to DC
b) DC to AC
c) Electrical energy to mechanical energy
d) Mechanical energy to electrical energy
Answer: a) AC to DC
91. In a DC motor, the torque is maximized when(PSSSB JE ELECTRICAL BOOK)
a) The back EMF is at its highest
b) The armature current is at its lowest
c) The armature current is at its highest
d) The field current is zero
Answer: c) The armature current is at its highest
92. In a shunt-wound DC motor, if the load increases, the speed(PSSSB JE ELECTRICAL BOOK)
a) Increases
b) Decreases
c) Remains constant
d) Becomes unpredictable
Answer: b) Decreases
93. The voltage output of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The number of conductors in the armature
b) The number of turns in the armature windings
c) The speed of rotation and the magnetic flux
d) The field current only
Answer: c) The speed of rotation and the magnetic flux
94. The field flux in a DC machine is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The speed of the armature
b) The load current
c) The field current
d) The armature resistance
Answer: c) The field current
95. A DC motor running without a load will eventually(PSSSB JE ELECTRICAL BOOK)
a) Stop due to lack of torque
b) Run at a constant speed
c) Increase speed until damage occurs
d) Reduce speed automatically
Answer: c) Increase speed until damage occurs
96. In a DC generator, which of the following factors can increase the output voltage? (PSSSB JE ELECTRICAL BOOK)
a) Increasing the resistance of the armature
b) Decreasing the speed of rotation
c) Increasing the number of coils in the armature
d) Decreasing the field current
Answer: c) Increasing the number of coils in the armature
97. The efficiency of a DC generator is highest when(PSSSB JE ELECTRICAL BOOK)
a) The armature is overloaded
b) The speed of rotation is optimal
c) The field current is at maximum
d) The armature resistance is at its lowest
Answer: b) The speed of rotation is optimal
98. The primary cause of energy loss in a DC machine is(PSSSB JE ELECTRICAL BOOK)
a) The resistance of the armature winding
b) The speed of rotation
c) The size of the commutator
d) The field current
Answer: a) The resistance of the armature winding
99. The torque developed in a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Inversely proportional to the armature current
b) Directly proportional to the field current
c) Directly proportional to the armature current and the field flux
d) Independent of the armature current
Answer: c) Directly proportional to the armature current and the field flux
100. A DC motor operating at no load will have a(PSSSB JE ELECTRICAL BOOK)
a) High back EMF
b) Low back EMF
c) High armature current
d) Low speed
Answer: a) High back EMF
1. What does the armature of a DC machine consist of?(PSSSB JE ELECTRICAL BOOK)
a) Copper coils
b) Iron core with coils
c) Steel laminations
d) Permanent magnets
Answer: b) Iron core with coils
2. The commutator in a DC machine is used to(PSSSB JE ELECTRICAL BOOK)
a) Increase efficiency
b) Reverse the direction of current
c) Reduce losses
d) Maintain constant voltage
Answer: b) Reverse the direction of current
3.
4. In a DC motor, the function of the field winding is to(PSSSB JE ELECTRICAL BOOK)
a) Generate torque
b) Provide mechanical energy
c) Create a magnetic field
d) Produce electricity
Answer: c) Create a magnetic field
5.
4. What is the primary purpose of the brush in a DC machine? (PSSSB JE ELECTRICAL BOOK)
a) To increase voltage
b) To transfer electrical current to the commutator
c) To maintain the speed of the motor
d) To reduce mechanical friction
Answer: b) To transfer electrical current to the commutator
6. Which of the following is true about a DC motor? (PSSSB JE ELECTRICAL BOOK)
a) It works on the principle of electromagnetic induction
b) The direction of rotation cannot be reversed
c) It operates on direct current only
d) It operates efficiently at high frequencies
Answer: c) It operates on direct current only
7. The speed of a DC motor is inversely proportional to(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance
b) The field current
c) The back EMF
d) The armature current
Answer: b) The field current
8. In a DC generator, the function of the armature winding is to(PSSSB JE ELECTRICAL BOOK)
a) Produce mechanical energy
b) Generate electrical power
c) Provide a magnetic field
d) Rotate the field poles
Answer: b) Generate electrical power
9. What is the significance of the commutator in a DC generator? (PSSSB JE ELECTRICAL BOOK)
a) To convert mechanical energy into electrical energy
b) To reverse the direction of current in the armature
c) To adjust the load current
d) To reduce the loss of energy
Answer: b) To reverse the direction of current in the armature
10. The efficiency of a DC machine depends on(PSSSB JE ELECTRICAL BOOK)
a) The load current
b) The size of the machine
c) The speed of the motor
d) The type of materials used
Answer: a) The load current
11. The field winding in a DC motor is placed on the(PSSSB JE ELECTRICAL BOOK)
a) Armature
b) Shaft
c) Poles
d) Commutator
Answer: c) Poles
12. A shunt-wound DC motor has a(PSSSB JE ELECTRICAL BOOK)
a) Low starting torque
b) High starting torque
c) Medium starting torque
d) No starting torque
Answer: a) Low starting torque
13. In a series-wound DC motor, the field winding is connected in(PSSSB JE ELECTRICAL BOOK)
a) Parallel to the armature
b) Series with the armature
c) Parallel to the stator
d) Separate from the armature
Answer: b) Series with the armature
14. The back EMF (Electromotive Force) in a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Directly proportional to the armature current
b) Inversely proportional to the speed of the motor
c) Zero when the motor is running
d) Produced by the rotating armature
Answer: d) Produced by the rotating armature
15. A DC motor will not start if(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance is too low
b) The field current is too high
c) The commutator is short-circuited
d) The brushes are worn out
Answer: b) The field current is too high
16. In a DC generator, the induced voltage depends on the(PSSSB JE ELECTRICAL BOOK)
a) Speed of rotation of the armature
b) Size of the commutator
c) Length of the armature windings
d) Material of the armature
Answer: a) Speed of rotation of the armature
17. The direction of rotation of a DC motor can be reversed by(PSSSB JE ELECTRICAL BOOK)
a) Reversing the field current
b) Reversing the armature current
c) Reversing the supply voltage
d) All of the above
Answer: d) All of the above
18. The main advantage of a separately excited DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Higher efficiency
b) High starting torque
c) Better control of speed
d) Low maintenance cost
Answer: c) Better control of speed
19. Which of the following is NOT a type of DC motor? (PSSSB JE ELECTRICAL BOOK)
a) Shunt motor
b) Series motor
c) Synchronous motor
d) Compound motor
Answer: c) Synchronous motor
20. In a DC motor, torque is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) Armature current and field flux
b) Voltage applied to the motor
c) Field current and speed
d) Armature resistance
Answer: a) Armature current and field flux
21. The main advantage of a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) High starting torque
b) Low maintenance
c) Constant speed operation
d) High efficiency
Answer: a) High starting torque
22. In a DC machine, the function of the pole shoes is to(PSSSB JE ELECTRICAL BOOK)
a) Direct the magnetic flux to the armature
b) Support the field windings
c) Reduce armature reaction
d) All of the above
Answer: d) All of the above
23. The efficiency of a DC motor increases with an increase in(PSSSB JE ELECTRICAL BOOK)
a) Field current
b) Armature resistance
c) Load current
d) Commutator speed
Answer: c) Load current
24. In a DC motor, the term "field flux" refers to(PSSSB JE ELECTRICAL BOOK)
a) The total current in the armature
b) The current flowing through the field winding
c) The magnetic field generated by the field winding
d) The back EMF generated in the motor
Answer: c) The magnetic field generated by the field winding
25. The main disadvantage of a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) It is more expensive than an AC motor
b) It requires frequent maintenance
c) It has low efficiency
d) It cannot be used for high-speed operations
Answer: b) It requires frequent maintenance
26. In a compound-wound DC motor, the field windings are connected in(PSSSB JE ELECTRICAL BOOK)
a) Series with the armature
b) Parallel with the armature
c) Both series and parallel
d) None of the above
Answer: c) Both series and parallel
27. The induced voltage in the armature of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The square of the flux
b) The speed of rotation of the armature
c) The field current
d) The resistance of the armature
Answer: b) The speed of rotation of the armature
28. The major difference between a DC motor and a DC generator is(PSSSB JE ELECTRICAL BOOK)
a) The DC motor uses mechanical energy to produce electrical energy
b) The DC generator uses electrical energy to produce mechanical energy
c) The DC motor has a commutator, while the generator does not
d) The DC motor has a lower operating speed than a generator
Answer: a) The DC motor uses mechanical energy to produce electrical energy
29. The back EMF in a DC motor is proportional to(PSSSB JE ELECTRICAL BOOK)
a) Armature voltage
b) Speed of rotation
c) Current flowing through the motor
d) Magnetic field strength
Answer: b) Speed of rotation
30. In a separately excited DC motor, the field winding is fed from(PSSSB JE ELECTRICAL BOOK)
a) A battery
b) The same source as the armature
c) A different external source
d) The commutator
Answer: c) A different external source
31. The polarity of the generated voltage in a DC generator depends on(PSSSB JE ELECTRICAL BOOK)
a) The direction of the magnetic field
b) The speed of rotation
c) The direction of current through the armature
d) All of the above
Answer: d) All of the above
32. The function of the armature in a DC motor is to(PSSSB JE ELECTRICAL BOOK)
a) Create a magnetic field
b) Convert electrical energy into mechanical energy
c) Reverse the direction of current
d) Maintain constant speed
Answer: b) Convert electrical energy into mechanical energy
33. The efficiency of a DC generator is affected by(PSSSB JE ELECTRICAL BOOK)
a) The load current
b) The material of the armature
c) The speed at which the armature rotates
d) All of the above
Answer: d) All of the above
34. A DC machine that operates as a motor has(PSSSB JE ELECTRICAL BOOK)
a) A rotating magnetic field
b) A stationary armature
c) An electromotive force in the stator
d) Mechanical energy converted to electrical energy
Answer: a) A rotating magnetic field
35. The flux produced in a DC machine is dependent on(PSSSB JE ELECTRICAL BOOK)
a) The amount of current in the armature
b) The strength of the field current
c) The temperature of the motor
d) The rotational speed of the armature
Answer: b) The strength of the field current
35. In a DC generator, the armature reaction causes(PSSSB JE ELECTRICAL BOOK)
a) An increase in voltage
b) A reduction in efficiency
c) The magnetic flux to distort
d) The commutator to spark
Answer: c) The magnetic flux to distort
36. The speed of a DC motor can be controlled by adjusting(PSSSB JE ELECTRICAL BOOK)
a) The supply voltage
b) The field current
c) The armature current
d) All of the above
Answer: d) All of the above
37. The power output of a DC generator is(PSSSB JE ELECTRICAL BOOK)
a) Equal to the input mechanical power
b) Less than the input mechanical power
c) Greater than the input mechanical power
d) Zero
Answer: b) Less than the input mechanical power
38. Which of the following components in a DC motor is responsible for converting the mechanical energy to electrical energy? (PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Armature
c) Field windings
d) Shaft
Answer: b) Armature
39. The armature winding in a DC machine is responsible for(PSSSB JE ELECTRICAL BOOK)
a) Generating the magnetic field
b) Supporting the field windings
c) Creating a path for current to flow
d) None of the above
Answer: c) Creating a path for current to flow
40. The total voltage generated by a DC generator depends on(PSSSB JE ELECTRICAL BOOK)
a) The number of coils in the armature
b) The speed of the armature rotation
c) The strength of the magnetic field
d) All of the above
Answer: d) All of the above
41. In a DC motor, if the field current is increased, the motor will(PSSSB JE ELECTRICAL BOOK)
a) Run faster
b) Run slower
c) Maintain constant speed
d) Stop functioning
Answer: b) Run slower
42. The main disadvantage of a shunt-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) It has low efficiency
b) It has a low starting torque
c) It requires more maintenance
d) It cannot be used at high speeds
Answer: b) It has a low starting torque
43. A compound-wound DC motor has(PSSSB JE ELECTRICAL BOOK)
a) Both series and shunt field windings
b) Only a shunt field winding
c) Only a series field winding
d) No field winding
Answer: a) Both series and shunt field windings
44. In a DC motor, what happens if the armature current is too high? (PSSSB JE ELECTRICAL BOOK)
a) The motor runs at higher speeds
b) The motor may overheat
c) The motor generates more torque
d) The motor’s efficiency increases
Answer: b) The motor may overheat
45. The voltage in a DC generator can be increased by(PSSSB JE ELECTRICAL BOOK)
a) Increasing the field current
b) Decreasing the speed of the armature
c) Reducing the load
d) Decreasing the number of armature coils
Answer: a) Increasing the field current
46. The efficiency of a DC machine decreases if(PSSSB JE ELECTRICAL BOOK)
a) The speed increases
b) The load increases
c) The resistance of the armature increases
d) The field current increases
Answer: c) The resistance of the armature increases
47. A DC motor operates based on the principle of(PSSSB JE ELECTRICAL BOOK)
a) Faraday's Law of Induction
b) Lenz's Law
c) Fleming’s Left Hand Rule
d) Fleming’s Right Hand Rule
Answer: c) Fleming’s Left Hand Rule
48. The field windings in a DC motor are generally made of(PSSSB JE ELECTRICAL BOOK)
a) Aluminum wire
b) Copper wire
c) Steel wire
d) Iron wire
Answer: b) Copper wire
49. A common application for a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) In high-speed applications
b) In applications where high starting torque is needed
c) In low-power applications
d) In constant-speed applications
Answer: b) In applications where high starting torque is needed
50. The current that flows in the armature of a DC motor is caused by(PSSSB JE ELECTRICAL BOOK)
a) The back EMF
b) The field current
c) The external load
d) The supply voltage
Answer: d) The supply voltage
51. The commutator in a DC generator serves to(PSSSB JE ELECTRICAL BOOK)
a) Reverse the direction of the armature current
b) Improve the efficiency of the machine
c) Maintain constant speed
d) Reduce armature resistance
Answer: a) Reverse the direction of the armature current
52. The mechanical energy output of a DC motor is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The supply voltage
b) The armature resistance
c) The speed of rotation
d) The torque developed
Answer: d) The torque developed
53. The field flux in a DC motor can be controlled by(PSSSB JE ELECTRICAL BOOK)
a) Adjusting the field winding resistance
b) Changing the supply voltage
c) Increasing the speed
d) Adjusting the armature current
Answer: a) Adjusting the field winding resistance
54. A dynamo is another name for a(PSSSB JE ELECTRICAL BOOK)
a) DC motor
b) DC generator
c) Transformer
d) Alternator
Answer: b) DC generator
55. The armature reaction in a DC motor results in(PSSSB JE ELECTRICAL BOOK)
a) Increased torque
b) Decreased efficiency
c) Distortion of the magnetic field
d) Higher starting current
Answer: c) Distortion of the magnetic field
56. In a DC machine, the speed of rotation is mainly influenced by(PSSSB JE ELECTRICAL BOOK)
a) The applied voltage
b) The load current
c) The field strength
d) The armature resistance
Answer: a) The applied voltage
57. A DC motor with high armature resistance will have(PSSSB JE ELECTRICAL BOOK)
a) High efficiency
b) Low efficiency
c) High torque
d) Low speed
Answer: b) Low efficiency
58. The torque in a DC motor is maximum when(PSSSB JE ELECTRICAL BOOK)
a) The motor is at full speed
b) The armature current is at its lowest
c) The field current is at its highest
d) The back EMF is low
Answer: d) The back EMF is low
59. The most common method to reverse the direction of a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Reversing the polarity of the field current
b) Reversing the armature current
c) Increasing the voltage supply
d) Changing the armature winding
Answer: a) Reversing the polarity of the field current
60. The efficiency of a DC generator is dependent on the(PSSSB JE ELECTRICAL BOOK)
a) Speed of the armature
b) Load connected to the generator
c) Size of the armature windings
d) Type of field winding used
Answer: b) Load connected to the generator
61. In a shunt-wound DC motor, the field winding is connected(PSSSB JE ELECTRICAL BOOK)
a) In parallel with the armature
b) In series with the armature
c) In parallel with the load
d) In parallel with the supply voltage
Answer: a) In parallel with the armature
62. The power loss in a DC machine is mainly caused by(PSSSB JE ELECTRICAL BOOK)
a) Heat produced by the field windings
b) Friction between the brushes and the commutator
c) Eddy currents in the armature
d) All of the above
Answer: d) All of the above
63. In a DC machine, the armature winding is connected to the commutator to(PSSSB JE ELECTRICAL BOOK)
a) Provide electrical contact to the external circuit
b) Increase the speed
c) Regulate the armature current
d) Reduce mechanical loss
Answer: a) Provide electrical contact to the external circuit
64. The construction of a DC motor does not include(PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Field windings
c) Rotor blades
d) Armature
Answer: c) Rotor blades
65. The field winding in a DC motor is placed on the(PSSSB JE ELECTRICAL BOOK)
a) Armature
b) Shaft
c) Poles
d) Commutator
Answer: c) Poles
66. The total voltage generated in a DC machine is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The number of armature coils
b) The speed of the armature
c) The length of the armature winding
d) The resistance of the field windings
Answer: b) The speed of the armature
67. The armature reaction in a DC machine affects(PSSSB JE ELECTRICAL BOOK)
a) Efficiency
b) Speed
c) Voltage regulation
d) Armature current
Answer: c) Voltage regulation
68. The purpose of the commutator in a DC motor is to(PSSSB JE ELECTRICAL BOOK)
a) Increase the speed
b) Reduce losses
c) Convert AC to DC
d) Maintain constant voltage
Answer: c) Convert AC to DC
69. A field winding in a separately excited DC motor is connected(PSSSB JE ELECTRICAL BOOK)
a) In parallel with the armature
b) In series with the armature
c) To a separate external source
d) To the same supply voltage as the armature
Answer: c) To a separate external source
70. The torque produced by a DC motor is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The square of the field flux
b) The armature current
c) The speed of rotation
d) The input power
Answer: b) The armature current
71. The most common type of DC motor used in applications requiring high starting torque is a(PSSSB JE ELECTRICAL BOOK)
a) Shunt-wound motor
b) Series-wound motor
c) Compound-wound motor
d) Permanent magnet motor
Answer: b) Series-wound motor
72. The efficiency of a DC motor can be improved by(PSSSB JE ELECTRICAL BOOK)
a) Reducing the armature resistance
b) Increasing the field current
c) Increasing the supply voltage
d) Decreasing the load current
Answer: a) Reducing the armature resistance
73. The total resistance in the armature circuit of a DC motor consists of(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance only
b) The field winding resistance only
c) The combined resistance of the armature and field winding
d) The brush resistance only
Answer: a) The armature resistance only
74. In a compound-wound DC motor, the field windings are(PSSSB JE ELECTRICAL BOOK)
a) Connected in series with the armature
b) Connected in parallel with the armature
c) Both series and parallel connected
d) Connected in parallel with the load
Answer: c) Both series and parallel connected
75. The direction of rotation of a DC motor is controlled by(PSSSB JE ELECTRICAL BOOK)
a) Reversing the armature current
b) Changing the supply frequency
c) Changing the field flux
d) All of the above
Answer: d) All of the above
76. The back EMF in a DC motor is generated by(PSSSB JE ELECTRICAL BOOK)
a) The mechanical motion of the armature
b) The commutator
c) The external load
d) The interaction between the field flux and armature windings
Answer: d) The interaction between the field flux and armature windings
77. The armature reaction in a DC machine is caused by(PSSSB JE ELECTRICAL BOOK)
a) The armature current and the magnetic field
b) The commutator sparking
c) The mechanical loss in the motor
d) The change in field flux
Answer: a) The armature current and the magnetic field
78. The efficiency of a DC generator decreases as(PSSSB JE ELECTRICAL BOOK)
a) The speed increases
b) The load increases
c) The field current decreases
d) The armature current decreases
Answer: b) The load increases
79. The maximum voltage that can be induced in the armature of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance
b) The speed of rotation
c) The magnetic flux
d) The back EMF
Answer: b) The speed of rotation
80. The purpose of the pole pieces in a DC machine is to(PSSSB JE ELECTRICAL BOOK)
a) Carry the armature current
b) Provide support for the field windings
c) Guide the magnetic field lines to the armature
d) Control the speed of the motor
Answer: c) Guide the magnetic field lines to the armature
81. The armature of a DC machine is typically made of(PSSSB JE ELECTRICAL BOOK)
a) Steel
b) Copper
c) Aluminum
d) Iron
Answer: d) Iron
82. Which of the following is a feature of a series-wound DC motor? (PSSSB JE ELECTRICAL BOOK)
a) It provides constant speed under varying loads
b) It has a high starting torque
c) It is ideal for precision speed control
d) It is used in low-speed applications
Answer: b) It has a high starting torque
83. In a compound-wound DC motor, the series field winding provides(PSSSB JE ELECTRICAL BOOK)
a) High starting torque
b) Increased efficiency
c) Constant speed
d) Higher voltage output
Answer: a) High starting torque
84. The main disadvantage of a series-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Low starting torque
b) It is sensitive to load fluctuations
c) High maintenance
d) It cannot be used in high-power applications
Answer: b) It is sensitive to load fluctuations
85. The primary application of a shunt-wound DC motor is(PSSSB JE ELECTRICAL BOOK)
a) High-speed applications
b) Constant speed applications
c) Low-speed applications
d) High-torque applications
Answer: b) Constant speed applications
86. The armature winding in a DC motor is typically connected to the(PSSSB JE ELECTRICAL BOOK)
a) Commutator
b) Shaft
c) Field poles
d) Brushes
Answer: a) Commutator
87. A compound-wound DC motor is commonly used in(PSSSB JE ELECTRICAL BOOK)
a) Fans and pumps
b) High-precision control systems
c) Applications requiring high-speed operation
d) Lifts and cranes
Answer: d) Lifts and cranes
88. The speed of a DC motor increases when(PSSSB JE ELECTRICAL BOOK)
a) The armature resistance increases
b) The field current decreases
c) The load on the motor decreases
d) Both b and c
Answer: d) Both b and c
89. The power factor in a DC motor can be improved by(PSSSB JE ELECTRICAL BOOK)
a) Increasing the armature current
b) Decreasing the back EMF
c) Improving the efficiency of the commutator
d) Increasing the field current
Answer: c) Improving the efficiency of the commutator
90. The commutator in a DC motor converts(PSSSB JE ELECTRICAL BOOK)
a) AC to DC
b) DC to AC
c) Electrical energy to mechanical energy
d) Mechanical energy to electrical energy
Answer: a) AC to DC
91. In a DC motor, the torque is maximized when(PSSSB JE ELECTRICAL BOOK)
a) The back EMF is at its highest
b) The armature current is at its lowest
c) The armature current is at its highest
d) The field current is zero
Answer: c) The armature current is at its highest
92. In a shunt-wound DC motor, if the load increases, the speed(PSSSB JE ELECTRICAL BOOK)
a) Increases
b) Decreases
c) Remains constant
d) Becomes unpredictable
Answer: b) Decreases
93. The voltage output of a DC generator is proportional to(PSSSB JE ELECTRICAL BOOK)
a) The number of conductors in the armature
b) The number of turns in the armature windings
c) The speed of rotation and the magnetic flux
d) The field current only
Answer: c) The speed of rotation and the magnetic flux
94. The field flux in a DC machine is directly proportional to(PSSSB JE ELECTRICAL BOOK)
a) The speed of the armature
b) The load current
c) The field current
d) The armature resistance
Answer: c) The field current
95. A DC motor running without a load will eventually(PSSSB JE ELECTRICAL BOOK)
a) Stop due to lack of torque
b) Run at a constant speed
c) Increase speed until damage occurs
d) Reduce speed automatically
Answer: c) Increase speed until damage occurs
96. In a DC generator, which of the following factors can increase the output voltage? (PSSSB JE ELECTRICAL BOOK)
a) Increasing the resistance of the armature
b) Decreasing the speed of rotation
c) Increasing the number of coils in the armature
d) Decreasing the field current
Answer: c) Increasing the number of coils in the armature
97. The efficiency of a DC generator is highest when(PSSSB JE ELECTRICAL BOOK)
a) The armature is overloaded
b) The speed of rotation is optimal
c) The field current is at maximum
d) The armature resistance is at its lowest
Answer: b) The speed of rotation is optimal
98. The primary cause of energy loss in a DC machine is(PSSSB JE ELECTRICAL BOOK)
a) The resistance of the armature winding
b) The speed of rotation
c) The size of the commutator
d) The field current
Answer: a) The resistance of the armature winding
99. The torque developed in a DC motor is(PSSSB JE ELECTRICAL BOOK)
a) Inversely proportional to the armature current
b) Directly proportional to the field current
c) Directly proportional to the armature current and the field flux
d) Independent of the armature current
Answer: c) Directly proportional to the armature current and the field flux
100. A DC motor operating at no load will have a(PSSSB JE ELECTRICAL BOOK)
a) High back EMF
b) Low back EMF
c) High armature current
d) Low speed
Answer: a) High back EMF
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