Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 12.
  24.
 6.
 16.

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Power Systems
Critical mass is

  minimum mass of fissionable material required to sustain chain reaction.
 a mass of fissionable material required to stop a chain reaction.
 none of these.
 maximum mass of fissionable material required to sustain a chain reaction.

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