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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Water.
  Liquid.
  Hydrogen.
  Air.

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

 Buccholz relays
 both 1 and 2
 over current relays
 Differential relays

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Power Systems
A power station plant load factor is defined as the ratio of

 minimum load to average load
 minimum load to peak load
 the energy generated to that of maximum energy that could have been generated
 average load to the peak load

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Power Systems
A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

  89.22 kVA.
 49 kVA.
 70 kVA.
  35 kVA.

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Power Systems
Capacitance voltage transformer ( CVT ) is used to

 none of these.
 reduce losses in a transmission line.
 connect instruments on the LT side.
  improve the power factor of the transmission.

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Power Systems
A generated station has a maximum demand of 30 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is

 12 MW
 10 MW
 6 MW
 5 MW

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