MGVCL Exam Paper (30-07-2021 Shift 2)
A circular loop has its radius increasing at a rate of 2 m/s. The loop is placed perpendicular to a constant magnetic field of 0.1 Wb/m². When the radius of the loop is 2 m, the emf induced in the loop will be

0.4π V
0.8π V
zero
0.2π V

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

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

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MGVCL Exam Paper (30-07-2021 Shift 2)
The wind speed increases with height because of

reduction in the gravitational force
reduction in lift effect of the air
enhancement of drag effect on the earth surface
reduction of drag effect of the earth surface

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