Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 12.5 A
 6.25 A
 10 A
 15 A

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Power Systems
Gas coolled reactor

 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.
 use CO2. or helium as coolant and graphite the moderator.
  both B and C.
 use heavy water as coolant as well as moderator.

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 lowering the value of K below 1 but later bringing it back to K = 1.
 lowering the value of K below and keeping at that lowered value.
  raising the value of K above 1, but later bringing it back to K = 1.
 raising the value of K above 1 and keeping it at raised value.

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