Power Systems - Interview Questions | Exam2Win

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91. If transformer frequency is changed from 60 Hz, to 60 Hz the ratio of eddy current loss 60 Hz to 50 Hz, at constant voltage will be

A. 5/6

B. 25/36

C. 6/5

D. 1.0

Explanation:

92. The aingle pbase line of 280 V and 3 pha.e line of 400 V which feed different domestic circuit. and induetrial loade represent

A. primary distribution

B. secondary distribution

C. secondary transmission

D. none of the above

Explanation:

93. In load flow analysis, the load connected at a bUs is represented as

A. constant current drawn from the bus

B. constant impedance connected at the bus

C. voltage and frequency dependent source at the bus

D. constant real and reactive drawn from the bus

Explanation:

94. A 10k VA, 400 V/200 V single phase transformer with 10 % impedance draws a steady short circuit line current of

A. 50 A

B. 150 A

C. 250 A

D. 350 A

Explanation:

95. For a transmission line with negligible losses, the lagging reactive power (VAR) delivered at Ihe receiving end, for a given receiving end voltage, is directly proportional to the

A. square of the line voltage drop

B. line voltage drop

C. line inductive reactance

D. line capacitive reactance

Explanation:

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