Electrical Engineering MCQ Questions on Power System.
Power System Multiple choice questions part 11
PSP Part 11, MCQ#1
Statement: Certain power system has phase to ground capacitance and inductance values 5 µF and 10 H respectively. If a magnetising current of 50 A is to be interrupted what is the value of voltage appearing across contacts of circuit breaker:
- 35.2 kV
- 70.7 kV
- 125 kV
- 175 kV
Correct answer: 70.7 kV
Formula:
v = i * √(L/C) = 50 A * √(10/5uF) = 70,710 V = 70.7 kV