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Power Systems QUESTIONS AND ANSWERS

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 2024 and IES 2024 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

98.32

97.25

96.85

96.12

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