Power Systems
Which of the following are the fissile materials

  None of these.
 U235 and Th239.
 U235, U233 and Pu239.
 U238 and Th232.

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Power Systems
Half life is defined as

 none of above.
  the time required for one half of isotope to decay.
 the time required to spiliting of a heavy nucleus.
 the time required for full of atoms in a specimen disintegrate.

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Power Systems
Gross head of an hydroelectric power station is

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

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