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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 cosφ = X/R
 tanφ = R/X
 cosφ = R/X

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Power Systems
Maximum power transfer in a transmission line can be obtained by

 either 1 or 2
None of these
 increasing voltage level
 reducing reactance

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Power Systems
Which of the following produces the radio interference in communication lines?

None of these
 electro static induction
 both 1 and 2
 electro magnetic induction

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Power Systems
Buchholz relay is used for protection of

  none of these.
  bus bar.
  transformer.
  alternator.

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Power Systems
The rating of fuse wire is always expressed in

  kWh.
  ampere-volts.
  amperes.
  ampere-hours.

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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

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

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