Power Systems
Which of the following power plants needs highly skilled/qualified engineers for its operation

 Gas-turbine.
 Nuclear.
 Hydro Power Plant
 Thermal.

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Power Systems
Critical mass is

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

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