Home > Electrical Engineering > Power Systems

Power Systems - Interview Questions and Answers

Prepare for your technical interview with these Power Systems questions.

Ready to test your skills?

Take a timed mock test specifically for Power Systems.

Start Mock Test
31. What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay of setting of 125% Tms = 0.6 It is connected to a supply circuit through a CT, 400 ratio. The fault current is 400 amp.
A. 10.Osec
B. 1.92sec
C. 4.5 sec
D. 2.4 sec
Explanation:
32. A three phase over head transmission line has its conductors horirzontally spaced with spacing between adjacent conductors equal to 'd'. if now the conductors of the line are rearranged to form and equilateral triangle of sides equal to 'd' then
A. average capacitance and inductance will increase
B. average capacitance will decrease and inductance will increase
C. average capacitance will increase and inductance will decrease
D. surge impedance loading of the line Increases
Explanation:
33. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between conductors is 3m. What is the inductance of each conductor per km?
A. 1.19 kH/km
B. 1.24 mH/km
C. 2.38 mH/km
D. 0.59 mH/km
Explanation:
34. In a DC transmission line
A. it is necessary for the sending end and receiving end to be operated in synchronism.
B. the effects of inductive and capacitive reactances are greater than in an AC transmission line of the same rating.
C. there are no effects due to inductive and capacitive reactances.
D. power transfer capability is limited by stability considerations.
Explanation:
35. If in a short transmission line, resistance and inductance are found to be equal and regulation appear. to be zero, then the load will
A. have unity power factor
B. have zero power factor
C. be 0.707 lagging
D. be 0.707 lagging
Explanation:
« Prev1234567891011121314151617181920Next »