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Power Systems

Power Systems
Which of the following plants is/are base load plants

 both 1 and 2
 nuclear
 run off river
 pump storage

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Power Systems
Inductance of transmission line will decrease when

 GMD decrease and GMR increase
 both GMD and GMR increase
 both GMD and GMR decrease
 GMD increase and GMR decrease

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Power Systems
Which type of connection is employed for current transformers for the protection of star- delta connected 3-phase transformer?

 star-star
 delta-star
 delta-delta
 star-delta

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 82.15 kV/phase
 41.075 kV/phase
 34.64 kV/phase
 17.32 kV/phase

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Power Systems
To improve the efficiency of thermal power plant ________________ is placed between boiler and turbine.

  superheater.
  economizer.
  ash handling point.
  air preheater.

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Power Systems
Offset mho relay is used for the protection of equipment when

 either 1 or 2
 failure of prime mover of the generator
 loss of excitation of the generator
None of these

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