Power Systems
A fuse wire of circular cross-section has a radius of 0.8 mm. The wire blows off at an current of 8 Amp. Calculate the radius of wire that will blow off at an current of 1 amp?

 4 mm.
  0.2 mm.
 0.4 mm.
 2 mm.

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

  raising the value of K above 1, but later bringing it back to K = 1.
 raising the value of K above 1 and keeping it at raised value.
 lowering the value of K below 1 but later bringing it back to K = 1.
 lowering the value of K below and keeping at that lowered value.

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

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

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