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Power Systems

Power Systems
Lightning arresters are made up of which material?

 silicon oxide
 copper
 silver
 any of the above

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Power Systems
In an induction relay for a particular current setting the operating time 4 sec. When the time multiplier setting is 0.8 if the time multiplier setting is rest to 1 the operating time is

 5.
  un changed.
  1.
 10.

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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

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

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Power Systems
A 60 Hz, 320 Km loss less line has sending end voltage 1.0 pu. The receiving end voltage on no-load is

  1.088 pu.
 none of these.
 1.1 pu.
 1.116 pu.

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Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

 2nd harmonic current.
 7th harmonic current.
  5th harmonic current.
 3rd harmonic current.

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Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Air blast CB
 Bulk oil type CB
 Sulphur hexafluoride CB
 Vacuum CB

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