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Power Systems

Power Systems
Mho relay is used for protection of

  none of these.
  long lines.
  short lines.
  medium lines.

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Power Systems
An alternator having an induced emf of 1.6 pu is connected to an infinite bus of 1 pu. If the bus bar has reactance of 0.6 pu and alternator has reactance of 0.2 pu, what is the maximum power that can be transferred?

 2.67 pu
 5 pu
 2 pu
 6 pu

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm cosωt?

 1.47 msec
 2.63 msec
 9.68
 4.68 msec

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

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

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Power Systems
Reheat cycle in thermal power plant is used to

 improve condenser performance.
 utilize heat of flue gases.
 reduce loss of heat.
  increase thermal efficiency.

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Power Systems
Radio interference occur in telecommunication line due to

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

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