Power Systems
Which of the following statements is/are true? By increasing of temperature,

 neither 1 nor 2
 both 1 and 2
 sag increase
 tension decrease

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Power Systems
Critical mass is

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

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