Power Systems
Mho relays are used for the protection of which of the following lines?

 long transmission lines only
 medium transmission lines only
 short transmission lines only
None of these

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Power Systems
In a pressurized water reactor

  both B and C.
 the coolant water boils in the reactor core.
 water is used at high pressure so that it is available is liquid from at about 280° C.
 heavy water is used as both coolant and moderator.

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Power Systems
Critical mass is

 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.
  minimum mass of fissionable material required to sustain chain reaction.

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