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)
Find the current through the resistor and the capacitor for the current shown in figure The switch is closed at t = O and initial change in the capacitor is zero.

I(t) = 5(1 - e⁵⁰⁰⁰ᵗ) A
I(t) = 10e⁵⁰⁰⁰ᵗ A.
I(t) = 10(1 - e⁵⁰⁰⁰ᵗ) A
I(t) = 5e⁵⁰⁰⁰ᵗ A.

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MGVCL Exam Paper (30-07-2021 Shift 3)
A single phase motor connected to 400 V, 50 Hz supply takes 25 A at a power factor of 0.75 lagging. Calculate the capacitance required in parallel with the motor to raise the power factor to 0.95 lagging.

72.55 pF
92.55 pF
82.55 pF
62.55 pF

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