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DC Generators - Interview Questions and Answers

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51. A D.C. welding generator has
A. lap winding
B. wave moving
C. duplex winding
D. any of the above
Explanation:
52. Compensating windings are used in D.C. generators
A. mainly to reduce the eddy currents by providing local short-circuits
B. to provide path for the circulation of cooling air
C. to neutralise the cross-magnetising effect of the armature reaction
D. none of the above
Explanation:
53. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?
A. Dummy coils
B. Commutator
C. Eye bolt
D. Equilizer rings
Explanation:
54. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be
A. 2 : 3
B. 3 : 1
C. 3 : 2
D. 1 : 3
Explanation:
55. Eddy currents are induced in the pole shoes of a D.C. machine due to
A. oscillating magnetic field
B. pulsating magnetic flux
C. relative rotation between field and armature
D. all above
Explanation:
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