Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

 none of these.
 oil circuit breaker.
  SF6 breaker.
 air blast circuit breaker.

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Power Systems
Half life is defined as

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

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