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

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

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MGVCL Exam Paper (30-07-2021 Shift 2)
In a short circuit test on circuit breaker, time to reach the peak re-striking voltage is 50 µs with the peak restriking voltage of 100 kV. Determine average RRRV (Rate of rise re-striking voltage)?

2 x 10⁶ kV/sec
3 x 10⁶ kV/sec
1 x 10⁶ kV/sec
4 x 10⁶ kV/sec

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MGVCL Exam Paper (30-07-2021 Shift 2)
A 50 Hz synchronous generator is connected to an infinite bus through a line. The p.u. reactances of generator and the line are j0.3 p.u. and j0.2 p.u. respectively. The generator no load voltage is 1.1 p.u. and that of infinite bus is 1.0 p.u. The inertia constant of the generator is 4 MW-sec/MVA. Determine the frequency of natural oscillations if the generator is loaded to 60% of its maximum power transfer capacity and small perturbation in power is given.

1.52 Hz
1.32 Hz
1.42 Hz
1.62 Hz

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MGVCL Exam Paper (30-07-2021 Shift 2)
A power factor less than unity results in which of the following disadvantages?
(i) Large kVA rating of equipment
(ii)Poor voltage regulation
(iii) Greater conductor size

(i) and (iii) only
(i), (ii) and (iii)
(i) and (ii) only
(ii) and (iii) only

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