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
0.8 Hz
1.8 Hz
1.2 Hz

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MGVCL Exam Paper (30-07-2021 Shift 3)
The purpose of ____ is to check the ability of the circuit breaker to withstand the overvoltages at power frequency as well as undesired value of voltage during lightning and other discharge phenomenon.

short circuit test
synthetic test
dielectric test
routine test

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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
None of these
Time graded protection
Reverse power protection

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MGVCL Exam Paper (30-07-2021 Shift 3)
The short circuit current of a solar cell is

constant and not affected by radiation
directly proportional to radiation intensity
changes logarithmically with radiation
inversely proportional to radiation intensity

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