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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.6 and 1.2 pu
 0.8, 0.8 and 0.8 pu
 0.6, 0.6 and 0.6 pu
 0.6, 0.8 and 1.2 pu

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Power Systems
Mho relay is used for protection of

  short lines.
  medium lines.
  none of these.
  long lines.

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

 lightning arrester
 CVT
 circuit breaker
 current transformer

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Power Systems
For a 500 Hz frequency excitation, a 100 km long power line will be modelled as

 medium transmission line
 any of the above
 long transmission line
 shunt capacitor

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Power Systems
In a regenerative cycle, feed water is heated by

  drained steam from turbine.
 all of above.
 heaters.
 exhaust gas.

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