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Power Systems

Power Systems
Skin effect depends on

 conductivity
 frequency
 relative permeability
All of these

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Power Systems
A power station plant load factor is defined as the ratio of

 average load to the peak load
 minimum load to average load
 minimum load to peak load
 the energy generated to that of maximum energy that could have been generated

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Power Systems
Which of the following method is used for changing power factor from leading to lagging

 any of the above
 shunt reactor
 series capacitor
 shunt capacitor

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 85%
 88.2%
 11.8%
 15%

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Power Systems
In which of the following frequency control method tie line may be overloaded?

 parallel frequency
 flat frequency control
All of these
 flat tie line control

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Power Systems
The function of a surge tank is to

 none of above.
  relieve water hammer pressure in the penstock.
 produce surge in the pipeline.
 supply water at constant pressure.

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