Power Systems
A Pelton wheel turbine having a rated speed of 300 rpm is connected to an alternator to produce power at 50 Hz. The number of poles required in the alternator is

 8
 20
 4
 10

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Power Systems
In a pressurized water reactor

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

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