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Power Systems

Power Systems
Bonding is done at the both ends of the cable to reduce the

 copper loss
 sheath loss
None of these
 iron loss

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.05 pu
 0.25 pu
 0.15 pu
 0.45 pu

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Power Systems
Peak load power plants is/are

 diesel plant
 both 1 and 2
 pumped storage plant
 nuclear plants

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Power Systems
Normally Z bus matrix is a

 null matrix
 full matrix
 unit matrix
 sparse matrix

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Power Systems
What will be the thermal efficiency of a 240 V, 1000 W electric kettle if it brings 2 liters of water at 15° C to boiling point 15 Minutes

  79.33 %.
 78.96 %.
  74.56 %.
 80.25 %.

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

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