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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 tanφ = R/X
 cosφ = R/X
 cosφ = X/R

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Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Capability of quick starts.
 Quick response to load variation.
 Low capital cost.
All of these

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Power Systems
The only place where slip ring induction motors used in thermal power plants is

  coal handling plant.
  lubrication oil pumps.
  conveyors.
  none of above.

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Power Systems
Telecommunication lines are transposed to reduce the

 radio interference in communication lines
 voltage level
 efficiency
All of these

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Power Systems
The function of moderator in a nuclear reactor is to

 reduce temperature.
  reduce the speed of neutrons.
 absorb neutrons.
  stop chain reaction.

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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 sinωt?

 2.63 msec
 1.47 msec
 9.68 msec
 4.68 msec

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