Power Systems
In a nuclear reator thermal energy is obtained from

 fusion of radioactive material.
 burning of fuel rods in oxygen.
 all of above.
  fission of radioactive material.

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