Power Systems
Which of following statement are false

 In a nuclear reactor, multiplication factor is kept almost equal to one.
 In nuclear power plants, chain reaction is controlled by cadmium rods.
 A thermal reactor needs a moderator material.
  Nuclear power plants are used as peak load plants only.

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Power Systems
An hydro-graph indicates

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

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