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Power Systems

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

  Air.
  Liquid.
  Water.
  Hydrogen.

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 500/5. The plug setting multiplier for a fault current of 5 kA is

 8
 5
 2
 6

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Power Systems
In thermal plant most of the energy is wasted in

 turbines
 condenser
 ESP
 boiler

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Power Systems
Where air circuit breakers are used?

  Up to 12 kV.
  Up to 66 kV.
  Up to 33 kV.
  Up to 11 kV.

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Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 42°
 36°
 90°
 45°

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Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

 none of these.
 oil circuit breaker.
 air blast circuit breaker.
  SF6 breaker.

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