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Power Systems - Interview Questions and Answers

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76. A synchronous motor connected to an infinite bUB takes power at a lag p.f. If its excitation is increased
A. the terminal voltage increases
B. the load angle increases
C. the p.f. of motor increases
D. all of the above
Explanation:
77. An alternator has a phase sequence of RYB for its phase voltage. In case the direetior of rotation of alternator is reversed, the phase sequence will become
A. RBY
B. RYB
C. YRB
D. none of these
Explanation:
78. For a 500 Hz frequency excitation, a 50 #em long power line will be modelled as
A. short line
B. medium line
C. long line
D. data insufficient for decision
Explanation:
79. When a d.c source is switched is purely inductive, the current response is
A. an exponentially rising curve
B. an exponentially decaying curve
C. a straight line passing through the origin
D. a straight line off-set from the origin
Explanation:
80. In case ora 3 phase short circuit in a system the power fed into the system is
A. mostly reactive
B. mostly active
C. active and reactive both equal
D. reactive only
Explanation:
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