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Power Systems

Power Systems
Breaking current is a ------------------ value?

 average
 maximum
 RMS
 any of the above

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Power Systems
The function of draft tube is reaction turbine is to

 increase flow rate of water.
 all of above.
  convert kinetic energy of water.
 reduce water hammer.

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Power Systems
Which of the following is/are the desirable properties of a insulator material?

 High relative permittivity
 High ratio of puncture strength to flash over.
 Both 1 and 2
 Low ratio of puncture strength to flash over.

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

  circular.
  none of these.
  spiral.
  elliptical.

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Power Systems
Radio interference occur in telecommunication line due to

 electro static induction
 electro magnetic induction
 nether 1 nor 2
 both 1 and 2

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 -2 - j 1 A
 5 + j 7 A
 1 + j 2 A
 1 + j 4 A

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