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DC Generators - Interview Questions and Answers

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66. Open circuited armature coil of a D.C. machine is
A. identified by the scarring of the commutator segment to which open circuited coil is connected
B. indicated by a spark completely around the commutator
C. both (a) and (b)
D. none of the above
Explanation:
67. For the parallel operation of two or more D.C. compound generators, we should ensure that
A. voltage of the incoming generator should be same as that of bus bar
B. polarity of incoming generator should be same as that of bus bar
C. all the series fields should be run in parallel by means of equilizer connection
D. series fields of all generators should be either on positive side or negative side of the armature
Explanation:
68. Which of the following could be lamina-proximately the thickness of lamina-tions of a D.C. machine ?
A. 0.005 mm
B. 0.05 mm
C. 0.5 m
D. 5 m
Explanation:
69. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be
A. 640 V
B. 620 V
C. 600 V
D. 580 V
Explanation:
70. D.C. generator generally preferred for charging automobile batteries is
A. series generator
B. shunt generator
C. long shunt compound generator
D. any of'the above
Explanation:
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