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DC Generators - Interview Questions and Answers

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106. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be
A. zero
B. small
C. the same as rated voltage
D. high
Explanation:
107. If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to
A. reverse the field connections
B. increase the field resistance
C. increase the speed of primemover
D. check armature insulation resis�tance
Explanation:
108. Which generator would you prefer for feeding long D.C. transmission lines ?
A. Series generator
B. Shunt generator
C. Over compound generator
D. Flat compound generator
Explanation:
109. A D.C. generator works on the principle of
A. Lenz's law
B. Ohm's law
C. Faraday's law of electromagnetic induction
D. none of the above
Explanation:
110. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage
A. will be less than 250 V
B. will always be 250 V
C. may be greater or less than 250 V
D. none of the above
Explanation:
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