MGVCL Exam Paper (30-07-2021 Shift 2)
In a synchronous motor with field under excited, the power factor will be

lagging
zero
leading
unity

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MGVCL Exam Paper (30-07-2021 Shift 2)
Which one of these is not a monitoring and diagnostic test for transformer oil?

Volatility Level Analysis
Furanic Compound Analysis
Dissolved Metals Analysis
Dissolved Gas Analysis

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

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MGVCL Exam Paper (30-07-2021 Shift 2)
A coil having an inductance of 100 mH is magnetically coupled to another coil having an inductance of 900 mH. The coefficient of coupling between the coils is 0.45. Calculate the equivalent inductance if the two coils are connected in series opposing.

730 mH
1270 mH
1135 mH
932 mH

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