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Power Systems

Power Systems
Surge impedance loading (SIL) is represented by

 Vl²/Zs
 both 1 and 2
 Vl²*√(C/L)
 Vph²/Zs

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Power Systems
A 20 MVA generator has inertia constant of 0.5 pu. Find new value for 50 MVA base?

 0.2 pu
 0.4 pu
 0.1 pu
 0.5 pu

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Power Systems
A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is

 25%
 66.66%
 33.33%
 75%

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Power Systems
The water from a catchment is 60*106 cu m annually and hydro station has head of 40 m. Assuming ideal generator and turbine, the power that can be theoretically generated is

 250 kW
 750 kW
 300 kW
 500 kW

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Power Systems
A transmission line has surge impedance of 400 Ω, operating at Vs = Vr = 400 kV line is compensated with a shunt capacitance of 30%. Find the surge impedance loading with compensation?

 478 MW
 386 MW
 400 MW
 456 MW

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Power Systems
Earthing switch is used for

 discharging residual energies
 protection of equipment from ground faults
 measuring of safety voltage
All of these

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