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Power Systems

Power Systems
Buchholz relay is used for protection of

  bus bar.
  alternator.
  none of these.
  transformer.

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Power Systems
For accurate load flow calculations on large power systems, the best method is

 N-R method
All of these
 Decoupled method
 G-S method

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Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Y-Δ connection
 Δ-Y connection
 Y-Y connection
 Δ-Δ connection

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Power Systems
If the frequency is increased, then skin effect will

 remains unaffected
 any of the above
 increases
 decreases

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Power Systems
Which of the following statements is/are true? By increasing of temperature,

 neither 1 nor 2
 sag increase
 tension decrease
 both 1 and 2

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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)?

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

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