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Power Systems

Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 78%
 82%
 76%
 80%

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Power Systems
Which of the following represents the sag(S) of a transmission line?

 S = wl²/2T
 S = wl²/4T
 S = wl²/16T
 S = wl²/8T

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Power Systems
In a regenerative cycle, feed water is heated by

 heaters.
  drained steam from turbine.
 all of above.
 exhaust gas.

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Power Systems
Incremental cost of two generators Ic1 = 0.2 P1+60, Ic2 = 0.3 P2+40 and the ratings of the generator are 150 and 250 MW. Find the load sharing of each generator for a load of 200 MW?

 P1 = 120 MW, P2 = 80 MW
 P1 = 80 MW, P2 = 120 MW
 P1 = 100 MW, P2 = 100 MW
 P1 = 60 MW, P2 = 140 MW

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

 capacitance
 inductance
 conductance
 both 1 and 2

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Power Systems
The shape of the disc of an induction disc relay is

  none of these.
  circular.
  elliptical.
  spiral.

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