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Power Systems

Power Systems
Operating time of pumped storage plant is

 very high
 high
 low
 can't say

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Power Systems
Length of short transmission line is up to

 any of the above
 150 km
 40 km
 80 km

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Power Systems
Reactance relays are used for the protection of

 medium transmission lines only
 long transmission lines only
All of these
 short transmission lines only

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Power Systems
Inductance of transmission line will decrease when

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

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

  air preheater.
  economizer.
  superheater.
  ash handling point.

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Power Systems
Which of the following methods is/are used for reactive or voltage compensation

All of these
 shunt capacitor
 generation excitation control
 series capacitor

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