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

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

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Power Systems
Gas coolled reactor

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

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Power Systems
Half life is defined as

  the time required for one half of isotope to decay.
 the time required to spiliting of a heavy nucleus.
 none of above.
 the time required for full of atoms in a specimen disintegrate.

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