MGVCL Exam Paper (30-07-2021 Shift 2)
Which one of the following statement is TRUE?

The current carrying capacity of cables in DC is less than that in AC.
Underground cables are laid at sufficient depth to avoid being unearthed easily due to removal of soil.
In the cables, the location of fault is usually found out by comparing the capacitances of insulated conductors.
In the cables, sheaths are used to provide enough strength.

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MGVCL Exam Paper (30-07-2021 Shift 2)
A 3-phase motor load has a p.f. of 0.397 lagging. The two wattmeter method used to measure power show the input as 30 kW. Find the reading on each wattmeter.

W1 = -5 kW and W2 = 35 kW
W1 = 5 kW and W2 = 25 kW
W1 = 10 kW and W2 = 20 kW
W1 = -10 kW and W2 = 40 kW

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MGVCL Exam Paper (30-07-2021 Shift 2)
The magnitude of the generator earth-fault current is limited by

using higher rating CTs
inserting suitable resistance in neutral grounding circuit
inserting the stabilizing resistance in series with the relay
controlling field exciter

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MGVCL Exam Paper (30-07-2021 Shift 2)
A single phase motor connected to 415 V, 50 Hz supply takes 30 A at a power factor of 0.7 lagging. Calculate the capacitance required in parallel with the motor to raise the power factor to 0.9 lagging.

66.32 µF
86.32 µF
76.32 µF
96.32 µF

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