DC Generators MCQs - Quiz 1

1. Which of the following is a part of DC machine?
A) Armature
B) Stator
C) Windings
D) All of above

The correct answer is D

2. The commutator segments and the armature conductors are connected with:
A) Copper lugs
B) Resistance wires
C) Insulation pads
D) Brazing

The correct answer is A

3. The field coils of D.C. generator are normally made of:
A) Mica
B) Carbon
C) Cast iron
D) Copper

The correct answer is D

4. In the commutator:
A) Copper is harder than mica
B) Mica and copper are equally hard
C) Mica is harder than copper
D) None of the above

The correct answer is C

5. According to Fleming's right-hand rule for finding the direction of induced emf, when middle finger points in the direction of induced emf, then forefinger will point in the direction of
A) Motion of conductor
B) Lines of force
C) Either of the above
D) None of the above

The correct answer is B

6. In a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give higher emf?
A) Wave winding
B) Lap winding
C) Either of A and B
D) Depends on other features of design

The correct answer is A

7. Laminations of core are generally made of
A) Cast iron
B) Carbon
C) Silicon steel
D) Stainless steel

The correct answer is C

8. If B is the flux density, L is the length of conductor and V the velocity of conductor, then induced emf is given by:
A) 2BLV
B) BLV
C) BL/V
D) None of the above

The correct answer is B

9. In case of a 4 pole DC generator provided with a two layer lap winding with sixteen coils, the pole pitch will be:
A) 4
B) 8
C) 16
D) 32

The correct answer is B

10. Iron losses in a D.C. machine are independent of variation in:
A) Speed
B) Voltage
C) Load
D) Speed and voltage

The correct answer is C