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

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

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MGVCL Exam Paper (30-07-2021 Shift 2)
A generating station having 'n' section busbars each rated at Q kVA with ×% reactance is connected on the tie-bars systems through busbar reactances of b%. Determine the short circuit kVA if a 3-phase fault takes place on one section.

Q[(1/x) + (n+1)/(bn+x)]
Q[(1/x) + (n-1)/(bn+x)]
Q[(1/x) + (n+1)/(bn-x)]
Q[(1/x) - (n+1)/(bn-x)]

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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
match the standard ratio of CTs used on both sides of the transformer winding
minimize the effect of saturation of the main CTs

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