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

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MGVCL Exam Paper (30-07-2021 Shift 2)
Thermocouples can be connected in series/parallel to obtain greater sensitivity called as

Thermopile
Thermistor
Thermometer
None of these

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MGVCL Exam Paper (30-07-2021 Shift 2)
In transformer, a Sweep Frequency Response Analysis (SFRA) test will help detect ____

Movement / damage to internal components
Aging by-products
Age of the insulation
Moisture in the windings

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MGVCL Exam Paper (30-07-2021 Shift 2)
In the circuit of figure, the switch is closed to position-1 for a long time. At t = 0 the switch position is changed from postion-1 to postion-2. Find an expression for the current i(t).

i(t) = (E/R) sin[1/√(LC)]t A
i(t) = (E/R) sin√(LC) t A
i(t) = (E/R) cos[1/√(LC)]t A
i(t) = (E/R) cos√(LC) t A

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