Power Systems
Which of following power plants will take long period in erection and installation

 Thermal.
 Hydro Power Plant
 Nuclear.
 Gas turbine.

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Power Systems
Critical mass is

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

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