MGVCL Exam Paper (30-07-2021 Shift 3)
If the velocity of wind is doubled then the power output will

reduced to half
doubled
increase by 8 times
increase by 6 times

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MGVCL Exam Paper (30-07-2021 Shift 3)
Determine the ohmic value of the current limiting reactor per phase external to a 40 MVA, 15 kV, 50 Hz, three phase synchronous generator which can limit the current on short circuit of 6 times the full load current. The reactance of the synchronous generator is 0.06 pu.

0.2 Ω
0.8 Ω
0.4 Ω
0.6 Ω

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MGVCL Exam Paper (30-07-2021 Shift 3)
A 50 Hz synchronous generator is connected to an infinite bus through a line. The p.u. reactances of generator and the line are j0.4 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.

1.6 Hz
1.8 Hz
0.8 Hz
1.2 Hz

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MGVCL Exam Paper (30-07-2021 Shift 3)
The most commonly used method for the protection of three phase feeder is

Differential protection
Reverse power protection
Time graded protection
None of these

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MGVCL Exam Paper (30-07-2021 Shift 3)
The miniature circuit breaker (MCB) with ____ trip characteristics trips instantaneously when the current flowing through it reaches between 10 to 20 times the rated current.

Class Z
Class D
Class C
Class B

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