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Power Systems

Power Systems
Uses of diesel power stations

All of these
 standby plants.
  peak load plant.
  emergency plants.

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Power Systems
The arc voltage produced in an AC circuit breaker is always

  in phase with the arc current.
 lagging the arc current by 90°.
 leading the arc current by 90°.
 in phase opposition with the arc current.

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Power Systems
Mho relays are used for the protection of which of the following lines?

None of these
 short transmission lines only
 long transmission lines only
 medium transmission lines only

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Power Systems
Bundled conductors are used for EHV transmission lines primarily for reducing the

 corona loss
 voltage drop across the line
 surge impedance of the line
 copper loss

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Power Systems
What are the methods of laying underground cables?

 Direct laying.
 Draw - in - system / duct - pipe laying.
  Both A and B.
 None of these.

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Power Systems
In a 400 KV network, 360 KV is recorded at a 400 KV bus. The reactive power absorbed by shunt rated for 50 MVAr, 400 KV connected at the bus is

 55.56 MVAr.
  40.5 MVAr.
 61.73 MVAr.
 45 MVAr.

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