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DC Generators - Interview Questions and Answers

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16. The bearings used to support the rotor shafts are generally
A. ball bearings
B. bush bearings
C. magnetic bearmgs
D. needle bearings
Explanation:
17. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
A. Lap winding
B. Wave winding
C. Either of (a) and (b) above
D. Depends on other features of design
Explanation:
18. In D.C. generators, the cause of rapid brush wear may be
A. severe sparking
B. rough commutator surface
C. imperfect contact
D. any of the above
Explanation:
19. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be
A. 4
B. 8
C. 16
D. 32
Explanation:
20. In D.C. generators, current to the external circuit from armature is given through
A. commutator
B. solid connection
C. slip rings
D. none of above
Explanation:
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