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Power Systems

Power Systems
Condition for maximum voltage regulation

 cosφ = R/X
 cosφ = X/R
 tanφ = R/X
 tanφ = X/R

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Power Systems
Non-commercial sources of energy are

  wood, animal wastes and agricultural wastes.
None of these
 solar, wind and biomass.
 fossil fuel, hydro power and nuclear power.

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Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 six
 two
 three
 one

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Power Systems
Which device is used for protection of equipment from from damage caused by overload or short circuit?

 current transformer
 CVT
 lightning arrester
 circuit breaker

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Power Systems
The positive sequence reactance will be equal to negative sequence if the equipment is

  generator.
  transformer and transmission lines.
  motor.
  none of these.

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Power Systems
Where the voltage is high and current to be interrupted is low, Which of following the breaker is preferable?

 Oil CB.
  Vacuum CB.
 Any of these.
 Air blast CB.

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