Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 4 MΩ
 32 MΩ
 8 MΩ
 16 MΩ

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Power Systems
An impulse turbine

 makes use of a draft tube.
 always operates submerged.
 is most suited for low head and high discharge power plants.
  operates by initial complete conversion to kinetic energy.

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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 for one half of isotope to decay.
 the time required to spiliting of a heavy nucleus.

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  operating coil current and restraining coil current.
  fault current and operating coil current.
  number of turns of restraining and operating coil.
  fault current and restraining coil current.

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