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Power Systems - Interview Questions and Answers

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71. An alternator has a phase sequence of RYB for itB phase voltage. In case offield current is reversed, the phase sequence will become
A. RBY
B. RYB
C. YRB
D. none of these
Explanation:
72. Pure inductive circuit takes power (reactive) from the a.c. line when
A. both applied voltage and current rise
B. both applied voltage anti current decrease
C. applied voltage decreases but current Increases
D. none of these
Explanation:
73. The insulation of modern EHV lines is designed based on
A. the lightning voltage
B. corona
C. radio interface
D. switching voltage
Explanation:
74. With the help of a reactive compensator it is possible to have (u) constant voltage opei ation only
A. unity p.f. operation only
B. both constant voltage and unity p.f.
C. either constant voltage or unity p.f.
D. either constant voltage or unity p.f.
Explanation:
75. At a particular unbalanced node, the real powers specified are Leaving the node : 20 Mw, 25 Mw, Entering the node: 60 Mw, 30 MW. The balance power will be
A. 30 MW leaving the node
B. 45 MW leaving the node
C. 45 MW entering the node
D. 22.5MW entering the node and 22.5 MW leaving the node
Explanation:
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