Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

 7th harmonic current.
  5th harmonic current.
 3rd harmonic current.
 2nd harmonic current.

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

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

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Power Systems
The factor affecting run off are

 rain fall pattern, shape and size of catchment area.
  all of above.
 amount of vegetation and weather condition in the catchment area.
 the topography and nature of soil in the catchment area.

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