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Power Systems

Power Systems
Phase shift occurs due to which of the following components?

 conductance
 capacitance
 inductance
 both 1 and 2

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Power Systems
Which of the following statements is/are true regarding HVDC?

 There is no skin effect in dc line
 Corona loss is very much reduced in the dc line
 HVDC can utilize earth for its return path
All of these

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Power Systems
A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

 1.476 A.
 14.7 mA.
  14.76 A.
 1 A.

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Power Systems
Reactance relays are used for the protection of

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

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Power Systems
The steam power plant efficiency can be improved by

 using large quantity of water.
  using high temperature and high pressure steam.
 burning large amount of coal.
 decreasing the load on the plant.

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Power Systems
Pelton wheel turbine is a

  none of above.
  low head turbine.
  medium head turbine.
  high head turbine.

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