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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 of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

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

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Power Systems
Power transmission lines are transposed to reduce

 radio interference
 skin effect
 ferranti effect
 proximity effect

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Power Systems
What is the approximate efficiency of a normal thermal power station?

 60-70%
 20-25%
 30-40%
 45-55%

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 12.5 A
 6.25 A
 10 A
 15 A

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Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" > X' >X
 X" < X' < X
 X" < X' > X
 X" > X' < X

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