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DC Generators - Interview Questions and Answers

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46. The armature of D.C. generator is laminated to
A. reduce the bulk
B. provide the bulk
C. insulate the core
D. reduce eddy current loss
Explanation:
47. D.C. generators are connected to the busbars or disconnected from them only under the floating condition
A. to avoid sudden loading of the primemover
B. to avoid mechanicaljerk to the shaft
C. to avoid burning of switch contacts
D. all above
Explanation:
48. Magnetic field in a D.C. generator is produced by
A. electromagnets
B. permanent magnets
C. both (a) and (b)
D. none of the above
Explanation:
49. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by
A. using conductor of annealed copper
B. using commutator with large number of segments
C. using carbon brushes of superior quality
D. using equiliser rings
Explanation:
50. In case of D.C. machine winding, number of commutator segments is equal to
A. number of armature coils
B. number of armature coil sides
C. number of armature conductors
D. number of armature turns
Explanation:
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