Power Systems
An hydro-graph indicates

 the average run off during the period.
 the discharge at any time during the period under consideration.
All of these
 the maximum and minimum run off during the period.

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

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