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Power Systems

Power Systems
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

 15.
 25.
 50.
 10.

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Power Systems
A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

 0.8, 0.6 and 1.2 pu
 0.8, 0.8 and 1.2 pu
 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 1.2 pu

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Power Systems
Installation of capacitors at suitable locations and of optimum size in a distribution system results in

All of these
 improved voltage regulation
 reduction in distribution power loss
 reduction of KVA rating of distribution transformers

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Power Systems
India’s largest thermal power station is located at

 Sarni.
 Neyveli.
 Kota.
 Chandrapur.

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Power Systems
Which of the following represents the sag(S) of a transmission line?

 S = wl²/4T
 S = wl²/16T
 S = wl²/8T
 S = wl²/2T

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Power Systems
If, for a given alternator in economic operation mode, the incremental cost is given by (0.012 P + 8) Rs/MWh, dPL/dP = 0.2 and plant λ = 25, then power generation is

 1000 MW
 750 MW
 1250 MW
 1500 MW

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