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Power Systems

Power Systems
Peak load power plants is/are

 pumped storage plant
 nuclear plants
 both 1 and 2
 diesel plant

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Power Systems
Buchholz relay is used for protection of

  none of these.
  bus bar.
  alternator.
  transformer.

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Power Systems
Equal area criteria is used for

 nether 1 nor 2
 either 1 or 2
 relative stability of the system
 absolute stability of the system

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Power Systems
If the diameter of the conductor is increased

 no change in inductance and resistance
 the inductance is decreased
 the resistance is increased
 the inductance is increased

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Power Systems
Power transmission lines are transposed to reduce

 skin effect
 ferranti effect
 proximity effect
 radio interference

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.5 pu, Zm =0.6 pu
 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.7 pu, Zm =0.2 pu

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