# 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 ANSWER : : constant real and reactive drawn from the bus Explanation :
 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 ANSWER : : 150 A Explanation :
 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 ANSWER : : line voltage drop Explanation :
 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 ANSWER : : 96.85 Explanation :
 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 ANSWER : : current delivered increases Explanation :

More Power Systems QUESTIONS AND ANSWERS available in next pages

Health is the greatest gift, contentment is the greatest wealth -Buddha
Too many of us are not living our dreams because we are living our fears.- Les Brown