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
 
Answer & Explanation Answer: A) 0.7595

Explanation: Not available for this question

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7
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
 
Answer & Explanation Answer: A) 3949.9

Explanation: Not available for this question

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13
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
 
Answer & Explanation Answer: A) 2.62

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

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10
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
 
Answer & Explanation Answer: A) 5

Explanation: Not available for this question

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12
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
 
Answer & Explanation Answer: A) 2.85

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

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10
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
 
Answer & Explanation Answer: A) LLG fault

Explanation: It is LLG fault.

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7
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
 
Answer & Explanation Answer: A) 0.25

Explanation: Not available for this question

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9
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
 
Answer & Explanation Answer: A) 50.25

Explanation: Not available for this question

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6