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.

1.2 Hz
1.8 Hz
0.8 Hz
1.6 Hz

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MGVCL Exam Paper (30-07-2021 Shift 3)
Medium voltage covered conductors (MVCC) are produced in voltage rating

beyond 200 kV
between 6.6 kV to 33 kV
between 132 kV to 200 kV
less than 3.3 kV

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MGVCL Exam Paper (30-07-2021 Shift 3)
Continuous and rapid variations in the load current magnitude which causes voltage variations is known as

Harmonics
Voltage sag
Flicker
Voltage distortion

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