Power Systems
Earthing switch is used for

 discharging residual energies
 measuring of safety voltage
All of these
 protection of equipment from ground faults

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Power Systems
Critical mass is

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

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