Power Systems
Electrostatic precipitators in thermal power plants are used for

 removal of ash from flue gas
 remove moisture from the cole
All of these
 control flow rate

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Power Systems
Half life is defined as

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

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