# Power System Mcqs

Q:

A lossless TL having SIL of 3000 MW is provided with uniform distributed series capacitance compensation of 25% and shunt compensation of 30% then the compensated impedance of TL will be(in pu) ____________

 A) 0.7595 B) 2.88 C) 0.647 D) 3.27

Explanation: Not available for this question

73
Q:

A lossless TL having SIL of 3000 MW is provided with uniform distributed series capacitance compensation of 25% and shunt compensation of 30% then the SIL of compensated TL will be _______________

 A) 3949.9 B) 3289 C) 2784.9 D) 2877.6

Explanation: Not available for this question

71
Q:

For a 100 MVA, 11 kV three phase Alternator observes a three phase fault at terminals of it. If the fault current is 2000 A, the pu value of positive sequence reactance ______

 A) 2.62 B) 0.46 C) 1.31 D) 0.92

Explanation: PU fault current = 2000/5248.63 = 0.381 pu
0.381 = 1/X
X= 1/0.381 =2.62 pu.

163
Q:

A fault current of 1500A passing through the primary side of a 400/5 CT. On the secondary side an inverse time over current relay is connected whose current setting is 75%, the plug setting is __________

 A) 5 B) 3.75 C) 6 D) 4

Explanation: Not available for this question

159
Q:

The inertia constant of two groups of machines which do not swing together are 4 and 20 MJ/MVA, the equivalent inertia constant of the system is _________

 A) 2.85 B) 14 C) 6 D) 12

Explanation: For the incoherent system, the equivalent inertia = H₁H₂/(H₁+H₂).

100
Q:

If all the sequence voltages at the fault point in a power system are equal, then fault is __________

 A) LLG fault B) LG fault C) Three phase to ground fault D) Line to Line fault

Explanation: It is LLG fault.

106
Q:

An isolated generator connected to a turbine with its continuous maximum power of 20 MW, 50 Hz. Generator connected with two loads of 8 MW, each operate at 50 Hz.. Generator has 5% droop characteristic. If an additional load of 6 MW is added then the change in the frequency will be ____________

 A) 0.25 B) 0.75 C) 0.5 D) 1

Explanation: Not available for this question

88
Q:

An isolated generator connected to a turbine with its continuous maximum power of 20 MW, 50 Hz. Generator connected with two loads of 8 MW, each operate at 50 Hz.. Generator has 5% droop characteristic. If an additional load of 6 MW is added then frequency will be ___________

 A) 50.25 B) 40.75 C) 49.75 D) 48.75

Explanation: Not available for this question