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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LG
 LL
 LLG
 LLL

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Power Systems
A thermal protection switch is used to provide protection against

  overload.
 temperature.
 over voltage.
 short circuit.

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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.
  zero.
  one - third of maximum.

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Power Systems
Efficiency of thermal power plant can be taken as

  generator efficiency.
  product of efficiencies of all stages.
  efficiency of thermal cycle.
  turbine efficiency.

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Power Systems
Which of the following is/are the stator faults?

All of these
 over current
 failure of excitation
 Inter phase faults

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Power Systems
Equal area criteria is used for

 nether 1 nor 2
 either 1 or 2
 absolute stability of the system
 relative stability of the system

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