Power Systems
The power output from an hydroelectric plants depend on

 type of dam, type of catchment area and discharge.
 type of turbine, type of dam and type of catchment area.
 type of dam, head, system efficiency.
  discharge, system efficiency.

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Power Systems
Half life is defined as

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

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