MCQs on Power Systems


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01․ In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is
0.200 pu.
0.075 pu.
0.125 pu.
3.000 pu.

Under construction.

02․ Capacitance voltage transformer ( CVT ) is used to
reduce losses in a transmission line.
improve the power factor of the transmission.
connect instruments on the LT side.
none of these.

Under construction.

03․ The unit protection scheme provides
simultaneous protection.
back up protection.
remote protection.
primary protection.

Under construction.

04․ In a 400 kV power network, 360 kV is recorded at 400 kV bus. The reactive power absorbed by a shunt reactor for 50 MVAr, 400 kV connected at the bus is
40.5 MVAr.
45.0 MVAr.
55.56 MVAr.
61.73 MVAr.

Under construction.

05․ The insulation of the modern EHV lines is designed based on
corona.
R × I.
the switch voltage.
the lighting voltage.

Under construction.

06․ The ratio of reset to pick up current for an induction cup relay is approximately
0.75.
0.99.
1.0.
1.35.

Under construction.

07․ Out of the following plant categories which is not the base load power plant?
Nuclear.
Run of river.
Pump storage.
Diesel.

Under construction.

08․ Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?
SF6 CB.
Vacuum CB.
Air blast CB.
Oil CB.

Under construction.

09․ To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with
3rd harmonic current.
2nd harmonic current.
5th harmonic current.
7th harmonic current.

Under construction.

10․ The insulation of modern EHV is designed based on
lightning voltage.
switching voltage.
corona.
RI.

Under construction.

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