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Power Systems

Power Systems
A gas turbine power plant is best suited for

 Base load.
 Peak load.
 None of these.
 Emergency.

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Power Systems
Advantage/s of per unit system as compare to absolute system?

 calculation time is less
All of these
 memory required is less
 only one equation is required

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Power Systems
The specific speed ( NS ) of turbine is given by

 N√( P ) / H2/3.
 P√( N ) / H3/2.
  N√( P ) / H1.25.
 none of these.

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 15 A
 10 A
 6.25 A
 12.5 A

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Power Systems
Most commonly used material for insulator is

 porcelain
 mica
All of these
 glass

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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)?

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

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