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Power Systems

Power Systems
Rankine cycle efficiency of a steam power plant is of

  60 - 80 %.
  30 - 45 %.
  20 - 30 %.
  45 - 80 %.

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.6 and 0.6 pu
 0.8, 0.8 and 0.8 pu
 0.6, 0.6 and 1.2 pu
 0.6, 0.8 and 1.2 pu

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Power Systems
In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using

 direct heat in the furnace.
 HP steam.
  flue gas.
 LP steam.

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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.
 1 A.
 14.7 mA.
  14.76 A.

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Power Systems
Which of the following statements is/are true? In case of parallel transmission lines

 fault current increases
 both 1 and 3
 fault current reduces
 stability increases

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Power Systems
Advantages of per unit system is/are

 Need of transformation ratio
All of these
 No units for any quantity
 It has units for all quantities

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