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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LL
 LG
 LLL
 LLG

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Power Systems
If the rated receiving end voltage is 33 kV, then what are the limits for safe operation of equipments?

 any voltage above 33 kV
 25 to 35 kV
 31.35 to 34.65 kV
 33 to 50 kV

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Power Systems
In a short circuit test circuit breaker, time to reach the peak re-striking voltage 60 microsecond & the peak re-striking voltage 120 kV. Determine average RRRV (Rate of rise re-striking voltage)?

  2 × 106 kV / sec.
 3.5 × 106 kV / sec.
 1 × 106 kV / sec.
  3 × 106 kV / sec.

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Power Systems
In which power plant, the thermal efficiency is quite low

  Diesel power plant.
  Hydro power plant.
  Nuclear power plant.
  Steam power plant.

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Power Systems
In hydro power stations what is an enlarged body of water just above the intake and used as a regulating reservoir called

 Penstock.
 Reservoir.
 Spillways.
  Fore bay.

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.200 pu.
 0.075 pu.
 0.125 pu.
  3.000 pu.

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