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DC Generator MCQs [Questions with Answers]: We will discuss Chapter Dc Generator multiple choice questions with answers from the Subject Electricity Engineering.
DC Generator MCQs
1. What is the purpose of a commutator in a DC generator?
A) To convert AC output to DC output
B) To convert DC input to AC output
C) To change the direction of the current in the armature coil
D) To connect the armature coil to the external circuit at the right time
Answer: D
2. Which of the following is NOT a part of a DC generator?
A) Stator
B) Rotor
C) Brushes
D) Slip rings
Answer: D
3. The armature of a DC generator is made up of:
A) Copper wire
B) Steel
C) Aluminum
D) Plastic
Answer: A
4. Which of the following is NOT a type of DC generator?
A) Series wound
B) Shunt wound
C) Compound wound
D) Synchronous wound
Answer: D
5. What is the function of the brushes in a DC generator?
A) To provide a magnetic field
B) To convert AC output to DC output
C) To connect the armature to the external circuit
D) To provide a sliding electrical contact with the commutator
Answer: D
6. Which of the following is true about a shunt wound DC generator?
A) The field winding is connected in series with the armature
B) The field winding is connected in parallel with the armature
C) The field winding is not necessary
D) The field winding is located outside the machine
Answer: B
7. What is the principle of operation of a DC generator?
A) Electromagnetic induction
B) Electromagnetic repulsion
C) Electromagnetic attraction
D) Electromagnetic radiation
Answer: A
8. In a DC generator, which of the following is true about the output voltage?
A) It is always constant
B) It is always proportional to the input current
C) It is always proportional to the input voltage
D) It depends on the speed of rotation and the strength of the magnetic field
Answer: D
9. Which of the following is true about a compound wound DC generator?
A) It has only one field winding
B) Its output voltage is always constant
C) It has both a series and shunt field winding
D) Its output voltage is always proportional to the input current
Answer: C
10. What is the difference between a DC generator and a DC motor?
A) A DC generator converts mechanical energy into electrical energy, while a DC motor converts electrical energy into mechanical energy
B) A DC generator has a rotor and a stator, while a DC motor has only a rotor
C) A DC generator produces a constant output voltage, while a DC motor produces a variable output voltage
D) A DC generator uses brushes to make contact with the commutator, while a DC motor uses slip rings
Answer: A
DC Generator Quiz | MCQ DC Generator
11. What is the direction of the induced EMF in a DC generator?
A) It is always in the same direction as the magnetic field
B) It is always in the opposite direction to the magnetic field
C) It depends on the direction of motion of the conductor
D) It depends on the strength of the magnetic field
Answer: C
12. Which of the following is true about a series wound DC generator?
A) The field winding is connected in series with the armature
B) The field winding is connected in parallel with the armature
C) The field winding is not necessary
D) The field winding is located outside the machine
Answer: A
13. What is the purpose of the field winding in a DC generator?
A) To provide a magnetic field
B) To convert AC output to DC output
C) To connect the armature to the external circuit
D) To provide a sliding electrical contact with the commutator
Answer: A
14. What is the role of the armature in a DC generator?
A) To produce the magnetic field
B) To provide the electrical power output
C) To transfer power from the external circuit to the generator
D) To connect the brushes to the commutator
Answer: B
15. Which of the following is true about the output voltage of a shunt wound DC generator?
A) It is always constant
B) It is always proportional to the input current
C) It is always proportional to the input voltage
D) It depends on the strength of the magnetic field
Answer: C
16. Which of the following is true about a separately excited DC generator?
A) Its field winding is connected in series with the armature
B) Its field winding is connected in parallel with the armature
C) Its field winding is not necessary
D) Its field winding is supplied by a separate power source
Answer: D
17. What is the purpose of the commutator in a DC generator?
A) To produce a magnetic field
B) To convert AC output to DC output
C) To change the direction of the current in the armature coil
D) To connect the field winding to the external circuit
Answer: C
18. Which of the following is true about the voltage regulation of a DC generator?
A) It is always perfect
B) It depends on the speed of rotation and the strength of the magnetic field
C) It depends on the type of load connected to the generator
D) It is independent of the load connected to the generator
Answer: B
19. What is the principle of operation of a separately excited DC generator?
A) Electromagnetic induction
B) Electromagnetic repulsion
C) Electromagnetic attraction
D) Electromagnetic radiation
Answer: A
20. Which of the following is true about the output current of a DC generator?
A) It is always constant
B) It is always proportional to the input voltage
C) It is always proportional to the input current
D) It depends on the speed of rotation and the strength of the magnetic field
Answer: D
21. Which of the following types of DC generator provides a nearly constant output voltage?
A) Series wound
B) Shunt wound
C) Compound wound
D) Separately excited
Answer: B
DC Generator Multiple Choice Questions
22. Which of the following is the primary disadvantage of a series wound DC generator?
A) It has a low efficiency
B) It has a high internal resistance
C) It produces a variable output voltage
D) It requires a large number of turns in the field winding
Answer: C
23. Which of the following is the primary advantage of a compound wound DC generator?
A) It provides a nearly constant output voltage
B) It has a low internal resistance
C) It is easy to construct
D) It is less expensive than other types of DC generators
Answer: A
24. Which of the following types of DC generator is commonly used in automobiles?
A) Series wound
B) Shunt wound
C) Compound wound
D) Separately excited
Answer: B
25. Which of the following is true about the armature winding in a DC generator?
A) It is wound around the field poles
B) It is wound in parallel with the field poles
C) It is wound in series with the field poles
D) It is wound in a zigzag pattern
Answer: B
26. Which of the following factors affects the output voltage of a DC generator?
A) The strength of the magnetic field
B) The speed of rotation
C) The number of turns in the armature winding
D) All of the above
Answer: D
27. Which of the following is true about the armature core in a DC generator?
A) It is made of iron or steel laminations
B) It is made of copper wire
C) It is located outside the machine
D) It is not necessary
Answer: A
28. What is the purpose of the brushes in a DC generator?
A) To produce a magnetic field
B) To convert AC output to DC output
C) To transfer electrical power from the armature to the external circuit
D) To connect the field winding to the external circuit
Answer: C
29. Which of the following is true about the output voltage of a compound wound DC generator?
A) It is always constant
B) It is always proportional to the input voltage
C) It is always proportional to the input current
D) It depends on the type of load connected to the generator
Answer: D
30. Which of the following is true about the output current of a DC generator?
A) It is always constant
B) It is always proportional to the input voltage
C) It is always proportional to the input current
D) It depends on the type of load connected to the generator
Answer: C
31. Which of the following is true about the speed regulation of a DC generator?
A) It is always perfect
B) It depends on the type of load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the load connected to the generator
Answer: B
32. Which of the following is true about the efficiency of a DC generator?
A) It is always perfect
B) It depends on the type of load connected to the generator
C) It depends on the speed of rotation and the strength of the magnetic field
D) It is independent of the load connected to the generator
Answer: C
DC Generator Questions
33. What is the principle of operation of a DC generator?
A) Electromagnetic induction
B) Electromagnetic repulsion
C) Electromagnetic attraction
D) Electromagnetic radiation
Answer: A
34. Which of the following is the most commonly used type of field winding in DC generators?
A) Series winding
B) Shunt winding
C) Compound winding
D) Separately excited winding
Answer: B
35. What is the function of the commutator in a DC generator?
A) To convert AC output to DC output
B) To control the speed of rotation
C) To reverse the direction of rotation
D) To change the direction of current flow in the armature
Answer: D
36. Which of the following factors affects the output current of a DC generator?
A) The strength of the magnetic field
B) The speed of rotation
C) The number of turns in the armature winding
D) All of the above
Answer: D
37. What is the purpose of the yoke in a DC generator?
A) To provide mechanical support for the machine
B) To produce a magnetic field
C) To convert AC output to DC output
D) To connect the field winding to the external circuit
Answer: A
38. Which of the following is the primary advantage of a separately excited DC generator?
A) It provides a nearly constant output voltage
B) It has a high efficiency
C) It produces a large output current
D) It is easy to construct
Answer: D
39. Which of the following is true about the voltage regulation of a DC generator?
A) It is always perfect
B) It depends on the type of load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the load connected to the generator
Answer: B
40. Which of the following is true about the current regulation of a DC generator?
A) It is always perfect
B) It depends on the type of load connected to the generator
C) It depends on the speed of rotation and the strength of the magnetic field
D) It is independent of the load connected to the generator
Answer: A
41. What is the difference between a DC generator and a DC motor?
A) A generator converts mechanical energy to electrical energy, while a motor converts electrical energy to mechanical energy
B) A generator uses a battery as its power source, while a motor uses AC power
C) A generator produces AC output, while a motor produces DC output
D) There is no difference, they are the same thing
Answer: A
42. Which of the following is the primary disadvantage of a separately excited DC generator?
A) It has a low efficiency
B) It produces a variable output voltage
C) It requires a large number of turns in the field winding
D) It is more expensive than other types of DC generators
Answer: B
43. Which of the following is true about the armature reaction in a DC generator?
A) It produces a magnetic field that opposes the main magnetic field
B) It produces a magnetic field that strengthens the main magnetic field
C) It has no effect on the main magnetic field
D) It produces a magnetic field that is perpendicular to the main magnetic field
Answer: A
44. What is the function of the field winding in a DC generator?
A) To convert mechanical energy to electrical energy
B) To provide mechanical support for the machine
C) To produce a magnetic field
D) To transfer electrical power from the armature to the external circuit
Answer: C
45. In a DC generator, what is the purpose of the brushes?
A) To provide a mechanical support for the armature
B) To transfer electrical power from the armature to the external circuit
C) To produce a magnetic field in the field winding
D) To convert AC output to DC output
Answer: B
46. Which of the following is the primary disadvantage of a shunt-wound DC generator?
A) It has a low efficiency
B) It produces a variable output voltage
C) It has a weak magnetic field
D) It is more expensive than other types of DC generators
Answer: B
47. What is the function of the armature in a DC generator?
A) To produce a magnetic field
B) To transfer electrical power from the field winding to the external circuit
C) To convert mechanical energy to electrical energy
D) To provide a mechanical support for the machine
Answer: C
48. Which of the following is true about the armature winding in a DC generator?
A) It is always a series winding
B) It is always a shunt winding
C) It can be either a series or a shunt winding
D) It is not required in a DC generator
Answer: C
49. Which of the following is true about the voltage produced by a DC generator?
A) It is always constant
B) It depends on the load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the speed of rotation
Answer: B
dc generator question and answer with solution pdf | dc generator question bank
50. What is the function of the voltage regulator in a DC generator?
A) To control the speed of rotation
B) To control the output voltage
C) To convert AC output to DC output
D) To change the direction of current flow in the armature
Answer: B
51. Which of the following is the primary advantage of a series-wound DC generator?
A) It provides a nearly constant output voltage
B) It has a high efficiency
C) It produces a large output current
D) It is easy to construct
Answer: C
52. Which of the following is true about the power output of a DC generator?
A) It is always constant
B) It depends on the load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the speed of rotation
Answer: B
53. Which of the following is true about the field winding in a DC generator?
A) It is always a series winding
B) It is always a shunt winding
C) It can be either a series or a shunt winding
D) It is not required in a DC generator
Answer: C
54. Which of the following is true about the efficiency of a DC generator?
A) It is always perfect
B) It depends on the load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the speed of rotation
Answer: B
55. Which of the following is true about the direction of rotation of a DC generator?
A) It is always clockwise
B) It is always counterclockwise
C) It depends on the polarity of the applied voltage
D) It depends on the number of poles in the machine
Answer: C
56. In a DC generator, what is the role of the commutator?
A) To provide a mechanical support for the armature
B) To convert AC output to DC output
C) To produce a magnetic field in the field winding
D) To transfer electrical power from the armature to the external circuit
Answer: D
57. Which of the following is true about the output voltage of a DC generator?
A) It is always constant
B) It depends on the load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the number of turns in the armature winding
Answer: B
58. What is the function of the field winding in a DC generator?
A) To produce a magnetic field
B) To transfer electrical power from the armature to the external circuit
C) To convert mechanical energy to electrical energy
D) To provide a mechanical support for the machine
Answer: A
59. Which of the following is true about the armature reaction in a DC generator?
A) It produces a magnetic field that opposes the field produced by the field winding
B) It produces a magnetic field that reinforces the field produced by the field winding
C) It does not affect the magnetic field produced by the field winding
D) It produces a magnetic field that is perpendicular to the field produced by the field winding
Answer: A
60. Which of the following is true about the efficiency of a shunt-wound DC generator?
A) It is always perfect
B) It is less than the efficiency of a series-wound DC generator
C) It is higher than the efficiency of a series-wound DC generator
D) It is independent of the load connected to the generator
Answer: C
61. Which of the following is true about the voltage regulation of a DC generator?
A) It refers to the ability of the generator to maintain a constant voltage output
B) It is independent of the load connected to the generator
C) It depends on the strength of the magnetic field
D) It is not important for the operation of a DC generator
Answer: A
62. Which of the following is true about the power rating of a DC generator?
A) It is always constant
B) It depends on the load connected to the generator
C) It depends on the strength of the magnetic field
D) It is independent of the speed of rotation
Answer: D
63. Which of the following is the primary disadvantage of a compound-wound DC generator?
A) It produces a variable output voltage
B) It has a weak magnetic field
C) It is more expensive than other types of DC generators
D) It has a low efficiency
Answer: A
64. What is the function of the yoke in a DC generator?
A) To provide a mechanical support for the armature
B) To transfer electrical power from the armature to the external circuit
C) To produce a magnetic field in the field winding
D) To complete the magnetic circuit and enhance the strength of the magnetic field
Answer: D
65. In a DC generator, what is the purpose of the brushes?
A) To convert AC output to DC output
B) To produce a magnetic field in the field winding
C) To transfer electrical power from the armature to the external circuit
D) To support the commutator and provide electrical contact between the armature and external circuit
Answer: D
66. What is the main advantage of a series-wound DC generator?
A) It produces a constant output voltage
B) It can handle a wide range of loads without significant changes in output voltage
C) It has a high efficiency
D) It has a simple and low-cost design
Answer: B
67. In a DC generator, what is the role of the armature?
A) To produce a magnetic field in the field winding
B) To provide a mechanical support for the machine
C) To convert mechanical energy to electrical energy
D) To transfer electrical power from the generator to the external circuit
Answer: C
68. Which of the following is true about the construction of a DC generator?
A) The field winding is located on the rotor
B) The armature is located on the stator
C) The commutator is located on the stator
D) The brushes are located on the rotor
Answer:
69. What is the function of the interpoles in a DC generator?
A) To provide a mechanical support for the armature
B) To reduce sparking at the brushes
C) To increase the strength of the magnetic field
D) To regulate the output voltage
Answer: B
70. Which of the following is true about the voltage regulation of a shunt-wound DC generator?
A) It is independent of the strength of the magnetic field
B) It is independent of the load connected to the generator
C) It refers to the ability of the generator to maintain a constant voltage output
D) It is poor compared to the voltage regulation of a series-wound DC generator
Answer: B
71. Which of the following is the primary advantage of a shunt-wound DC generator?
A) It has a high efficiency
B) It produces a constant output voltage
C) It can handle a wide range of loads without significant changes in output voltage
D) It has a simple and low-cost design
Answer: B
72. What is the function of the commutating poles in a DC generator?
A) To produce a magnetic field that opposes the armature reaction
B) To increase the strength of the magnetic field
C) To reduce the armature resistance
D) To increase the output voltage
Answer: A
73. Which of the following is true about the efficiency of a DC generator?
A) It is always perfect
B) It depends on the load connected to the generator
C) It is independent of the strength of the magnetic field
D) It is independent of the type of winding used in the machine
Answer: B
74. Which of the following is true about the power factor of a DC generator?
A) It is always unity
B) It is always zero
C) It depends on the load connected to the generator
D) It is independent of the strength of the magnetic field
Answer: A
75. Which of the following is a disadvantage of a DC generator compared to an AC generator?
A) It is more expensive to manufacture
B) It has a more complex design
C) It cannot handle high power loads
D) It is less efficient at high speeds
Answer: D
76. In a DC generator, what is the effect of reversing the direction of rotation of the armature?
A) The output voltage is reduced
B) The output voltage is increased
C) The direction of the current in the external circuit is reversed
D) The direction of the magnetic field is reversed
Answer: C
77. Which of the following is true about the armature reaction in a DC generator?
A) It is always negligible
B) It causes the magnetic field to be distorted
C) It increases the output voltage
D) It decreases the efficiency of the generator
Answer: B
78. What is the main disadvantage of a compound-wound DC generator?
A) It has a low efficiency
B) It produces a variable output voltage with changes in load
C) It has a more complex design than a shunt-wound generator
D) It is more expensive to manufacture than a shunt-wound generator
Answer: B
79. Which of the following is true about the speed of a DC generator?
A) It is independent of the load connected to the generator
B) It is always constant
C) It depends on the strength of the magnetic field
D) It is inversely proportional to the output voltage
Answer: C
80. What is the function of the field winding in a DC generator?
A) To produce a magnetic field that rotates with the armature
B) To produce a magnetic field that is stationary
C) To produce a voltage output
D) To regulate the output voltage
Answer: B
81. Which of the following is true about the voltage output of a DC generator?
A) It is always constant
B) It depends on the speed of rotation of the armature
C) It is independent of the strength of the magnetic field
D) It is independent of the type of winding used in the machine
Answer: B
82. In a DC generator, what is the purpose of the armature winding?
A) To produce a magnetic field in the field winding
B) To transfer electrical power from the generator to the external circuit
C) To produce a voltage output
D) To support the commutator and provide electrical contact between the armature and external circuit
Answer: C
83. Which of the following is true about the output voltage of a series-wound DC generator?
A) It is always constant
B) It depends on the speed of rotation of the armature
C) It is independent of the load connected to the generator
D) It is higher than the output voltage of a shunt-wound DC generator
Answer: D
84. What is the effect of increasing the strength of the magnetic field in a DC generator?
A) The output voltage is reduced
B) The efficiency of the generator is reduced
C) The speed of the armature is increased
D) The output voltage is increased
Answer: D
85. In a DC generator, what is the purpose of the commutator?
A) To regulate the output voltage
B) To produce a magnetic field
C) To convert AC to DC
D) To provide electrical contact between the armature and external circuit
Answer: D
86. Which of the following is true about the construction of a DC generator?
A) The field winding is located on the rotor
B) The armature winding is located on the stator
C) The commutator is located on the rotor
D) The brushes are located on the stator
Answer: C
87. In a DC generator, what is the effect of increasing the resistance of the external circuit?
A) The output voltage is increased
B) The output voltage is decreased
C) The efficiency of the generator is increased
D) The efficiency of the generator is decreased
Answer: B
88. What is the effect of increasing the number of poles in a DC generator?
A) The output voltage is increased
B) The efficiency of the generator is increased
C) The speed of the armature is increased
D) The size and weight of the generator are increased
Answer: A
89. Which of the following is true about the output voltage of a shunt-wound DC generator?
A) It is constant regardless of the load connected to the generator
B) It decreases as the load connected to the generator increases
C) It increases as the load connected to the generator increases
D) It is not affected by changes in the speed of rotation of the armature
Answer: A
90. Which of the following is a common application of a DC generator?
A) Generating electricity for household use
B) Charging batteries in electric vehicles
C) Powering electric motors in industrial machinery
D) Transmitting electrical signals in telecommunications
Answer: B
91. In a DC generator, what is the effect of decreasing the resistance of the external circuit?
A) The output voltage is increased
B) The output voltage is decreased
C) The efficiency of the generator is increased
D) The efficiency of the generator is decreased
Answer: A
92. What is the main advantage of a shunt-wound DC generator compared to a series-wound DC generator?
A) It has a higher efficiency
B) It can produce a higher output voltage
C) It can handle a wider range of loads
D) It has a simpler design
Answer: C
93. In a DC generator, what is the function of the brushes?
A) To produce a magnetic field
B) To transfer electrical power from the generator to the external circuit
C) To regulate the output voltage
D) To provide electrical contact between the armature and external circuit
Answer: D
94. Which of the following is true about the armature winding in a DC generator?
A) It is always a series-wound winding
B) It is always a shunt-wound winding
C) It can be either a series-wound or a shunt-wound winding
D) It is not important for the operation of the generator
Answer: C