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MGVCL Exam Paper (30-07-2021 Shift 1)
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An RC series circuit with R = 150 Ω and C = 2 μF is excited by a DC source of 15 V by closing the switch at t = 0 with an initially uncharged capacitor. The initial and final voltages across the capacitor respectively are

For t = 0 in RC circuit,

After t = 0+ condition, capacitor is behave as short circuit.

Voltage across the it 0.

At final time,

Capacitor is behave as open circuit, voltage across the capacitor at final time is equal to 15 V.

Capacitor opposes the change of voltage.

MGVCL Exam Paper (30-07-2021 Shift 1)
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A coil having an inductance of 100 mH is magnetically coupled to another coil having an inductance of 900 mH. The coefficient of coupling between the coils is 0.45. Calculate the equivalent inductance if the two coils are connected in series aiding.

Mutual inductance (M) = k*√(L1*L2)

k = 0.45

M = 0.45*√(900*100*10⁻⁶) = 135 mH

Leq = L1 + L2 + 2M

Leq = 900 + 100 + 270

Leq = 1270 mH

MGVCL Exam Paper (30-07-2021 Shift 1)
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What is the largest thermal power plant in India?

Tank - Name of power station - capacity

1 - Vindhyachal Thermal Power Station - 4,760MW.

2 - Mundra Thermal Power Station - 4620 MW

3 - The Sasan Ultra Mega power plant - 3960 MW

4 - The Tiroda thermal power plant - 3300 MW