Power Systems
The rate of rise of re-striking voltage is dependent upon

 both 1 and 2
 capacitance of the system only
 resistance of the system only
 inductance of the system only

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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.
 none of above.
 the time required to spiliting of a heavy nucleus.

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