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Power Systems

Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LLG
 LLL
 LG
 LL

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Power Systems
The shape of the disc of an induction disc relay is

  spiral.
  elliptical.
  circular.
  none of these.

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Power Systems
Which of the following circuit breakers produce least arc energy?

 Plain oil CB.
 Minimum oil CB.
 Air break CB.
  Air blast CB.

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Power Systems
Surge impedance loading (SIL) is represented by

 both 1 and 2
 Vph²/Zs
 Vl²/Zs
 Vl²*√(C/L)

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Power Systems
Buchholz relay is used for protection of

  bus bar.
  transformer.
  none of these.
  alternator.

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Power Systems
For variable heads of near about but less than 30 meters, which type of turbine is used in hydro power station?

None of these
 Francis
 Kaplan
 Pelton

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