MGVCL Exam Paper (30-07-2021 Shift 2)
Operating system is

a program that runs during log off
a layer between the user and the hardware
a program that runs during log off
a program that runs for short duration

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MGVCL Exam Paper (30-07-2021 Shift 2)
In transformer, a Sweep Frequency Response Analysis (SFRA) test will help detect ____

Moisture in the windings
Movement / damage to internal components
Age of the insulation
Aging by-products

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MGVCL Exam Paper (30-07-2021 Shift 2)
A 50 Hz synchronous generator is connected to an infinite bus through a line. The p.u. reactances of generator and the line are j0.3 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.

1.32 Hz
1.42 Hz
1.62 Hz
1.52 Hz

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

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

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