Power Systems
Plug setting of a relay can be altered by varying

 none of these.
 adjustable back up stop.
 air gap of magnetic path.
 no. of ampere-turns.

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Power Systems
Half life is defined as

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

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