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Power Systems

Power Systems
If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.

 7.
 3.
  5.
 20.

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Power Systems
A transmission line has a reactance of 1 Pu is operating at Vs = Vr = 1 Pu. The generator is connected at source end which is delivering 0.5 Pu of active power. Find the load angle?

 35°
 45°
 30°
 60°

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Power Systems
If in a line, resistance and reactance are found to be equal and regulation is zero, then load will have

 0.707 leading power factor
 0.707 lagging power factor
 unity power factor
 zero power factor

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Power Systems
Under excited Synchronous phase modifier works as

 shunt capacitor
 shunt reactor
 any of the above
 series capacitor

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Power Systems
Lightning arresters are used for

 protection of equipment from external lightning
 protection of equipment from open circuits
 protection of equipment from short circuits
All of these

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Power Systems
Cheapest plant in operation and maintenance is

  nuclear.
  diesel power.
  steam power.
  hydroelectric.

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