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

zero
unity
leading
lagging

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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)?

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

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

reduction in lift effect of the air
reduction of drag effect of the earth surface
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)
Interposing current-transformer (CT) is used in differential protection of a transformer to

increase the sensitivity of the relay
limit the main CT secondary current
minimize the effect of saturation of the main CTs
match the standard ratio of CTs used on both sides of the transformer winding

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