Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 210 Ω
 840 Ω
 420 Ω
 400 Ω

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Power Systems
In a pressurized water reactor

 water is used at high pressure so that it is available is liquid from at about 280° C.
 the coolant water boils in the reactor core.
  both B and C.
 heavy water is used as both coolant and moderator.

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

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