Power Systems
Operating cost of thermal power station is

 is the same as that of nuclear power plant.
  less than that of diesel power plant.
 less than that of hydroelectric power plant.
 less than that of nuclear power plant.

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Power Systems
Critical mass is

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

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