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Power Systems

Power Systems
Operating time of pumped storage plant is

 very high
 high
 can't say
 low

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Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

 0.92
 0.56
 -0.56
 -0.92

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Power Systems
Which of the following relays is/are unit protection relays?

 both 1 and 2
 over current relays
 Differential relays
 Buccholz relays

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xs +2 Xm
 Xm - Xs
 Xs - Xm
 2Xs + Xm

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Power Systems
The receiving end voltage for a long line under no load condition is

 more than the sending end voltage
 less than the sending end voltage
 any of the above
 equal to the sending end voltage

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

 lagging.
 unity.
  leading.
 zero.

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