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Power Systems

Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 0.93
 1
 0.882
 1.13

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Power Systems
In a thermal power plants, pressure in the working fluid cycle is developed by

  feed water pump.
 condenser.
 superheater.
 turbine.

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Power Systems
Which cooling is preferred for large turbine generator

  None of these.
  Oxygen cooling.
  Hydrogen cooling.
  Nitrogen cooling.

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Power Systems
A diesel power plant is generally used as a/an

 Peak loads.
 Any of above.
 Standby/emergency plant.
 Base load.

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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.

 20.
 7.
  5.
 3.

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Power Systems
A cable has the following characteristics, L = 0.201 µH/m and C = 196.2 pF/m. The velocity of wave propagation through cable is

 32 m/s
 159.24 m/s
 159.24 m/µs
 0.0312 m/s

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