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Power Systems

Power Systems
Mho relay is used for protection of

  medium lines.
  long lines.
  none of these.
  short lines.

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Power Systems
When a nuclear reaction is operating at constant power the multiplication factor is

 less than 1.
 greater than 1.
  1.
 may be any of the above.

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Power Systems
Alternate formation and breakage of bubbles are called

  water hamming.
  cavitations.
  surgfication.
All of these

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 86%%
 75%
 50%
 90%

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 in phase opposition with the arc current.
  in phase with the arc current.
 leading the arc current by 90°.
 lagging the arc current by 90°.

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Power Systems
A thermal generating station has an installed capacity of 15 MW and supplies a daily load of 10 MW for 12 hours and 5 MW for remaining 12 hours. The plant capacity factor for the station is

 1
 0.5
 0.6
 0.75

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