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POWER SYSTEMS

Power Systems
Lightning arresters are used to protect electrical equipment against

 over currents due to lightning stroke.
  over voltages due to indirect lightning stroke.
 direct strokes of lightning.
 power frequency of over voltages.

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Power Systems
Resistance switching in normally employed in

 all breakers.
  air blast circuit breaker.
 bulk oil breakers.
 minimum oil breakers.

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Power Systems
The use of high speed circuit breakers

  improves system stability.
 reduces the short circuit current.
 increased the short circuit current.
 decrease system stability.

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Power Systems
Zero sequence currents can flow from a line into a transformer bank if the windings are in

 delta / delta.
  ground star / delta.
 delta / star.
 star / grounded star.

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.125 pu.
  3.000 pu.
 0.075 pu.
 0.200 pu.

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