Electrical Engineering Questions And Answers :: Power Systems: part4

Electrical Engineering : Power Systems QUESTIONS AND ANSWERS :: part4 : 21 to 25

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

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

constant current drawn from the bus
constant impedance connected at the bus
voltage and frequency dependent source at the bus
constant real and reactive drawn from the bus

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

50 A
150 A
250 A
350 A

23.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

square of the line voltage drop
line voltage drop
line inductive reactance
line capacitive reactance

24.The percentage resistance and percentage reactance of a 10 kVA, 400 V/200 V, 3-phase transformer are 2% and 10% respectively. If the constant losses in the machine are 1 %, the maximum possible percentage efficiency of the transformer is


25.A synchronous generator connected to an infinite bUB delivers power at a lag p.r. If its excitation is increased

the terminal voltage increases
voltage angle 8 increases
current delivered increases
all of the above

More Power Systems QUESTIONS AND ANSWERS available in next pages

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