Power Systems
Which of following statement are false

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

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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the tail race is provided.
  the difference of water level between the level in storage and tail race.
 the height of water level in the river where the storage is provided.
 all of above.

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