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DC Generators - Interview Questions and Answers

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56. If a D.C. generator fails to build up the probable cause could not be
A. imperfect brush contact
B. field resistance less than the critical resistance
C. no residual magnetism in the generator
D. faulty shunt connections tending to reduce the residual magnetism
Explanation:
57. The resistance of armature winding depends on
A. length of conductor
B. cross-sectional area of the conductor
C. number of conductors
D. all of the above
Explanation:
58. Permeance is the reciprocal of
A. flux density
B. reluctance
C. ampere-turns
D. resistance
Explanation:
59. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when
A. r.p.m. is more than 300
B. r.p.m. is less than 300
C. number of poles is 4
D. number of poles is 2
Explanation:
60. The purpose of providing dummy coils in a generator is
A. to reduce eddy current losses
B. to enhance flux density
C. to amplify voltage
D. to provide mechanical balance for the rotor
Explanation:
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