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Power Systems

Power Systems
In nuclear power plants which material is/are used as coolant?

 graphite
 liquid sodium
 beryllium
All of these

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Power Systems
An isolated synchronous generator with transient reactance equal to 0.1 pu on a 100 MVA base is connected to the high voltage bus through a step up transformer of reactance 0.1 pu on a 100 MVA base. The fault level at the bus is

 400 MVA
 100 MVA
 200 MVA
 500 MVA

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Power Systems
Recovery voltage in CB is equal to

  arcing period voltage.
  normal frequency 50 Hz rms voltage.
  transient voltage.
  none of these.

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Power Systems
The specific speeds of Kaplan, Francis and Pelton turbines are in

 neither increasing nor decreasing order.
None of these
 the increasing order.
  the decreasing order.

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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

 0.25 pu
 0.05 pu
 0.15 pu
 0.45 pu

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Power Systems
A 1-phase transmission line has an impedance (4 + 3j ) Ω. Find the power factor of the load for zero voltage regulation?

 0.6 lead
 0.8 lead
 0.8 lag
 0.6 lag

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