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Power Systems

Power Systems
Rankine cycle efficiency of a steam power plant is of

  20 - 30 %.
  30 - 45 %.
  60 - 80 %.
  45 - 80 %.

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Power Systems
Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is

 125 MVA
 100 MVA
 500 MVA
 400 MVA

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Power Systems
A thermal power plant is being supplied with coal having much more ash content than that for which it was designed. Which of its following units needs major modifications

 Ash handling unit.
 Cooling tower.
 Pulversing unit.
 Condenser.

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Power Systems
The generating station suitable to operate as peak load plant is

 Power station.
 Thermal power station.
 Nuclear power station.
  Pumped storage.

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Power Systems
Main bus bar protection scheme is /are

  fault bus protection.
  none of these.
  both fault bus and differential protection.
  differential protection.

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Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  one - third of minimum.
  two - thirds of maximum.
  one - third of maximum.
  zero.

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