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Power Systems

Power Systems
Mho relay is used for protection of

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

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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?

 4.68 msec
 2.63 msec
 1.47 msec
 9.68

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Power Systems
In a transmission line the insulators to be used at the dead end or sharp curves are

 suspension type
 any of the above
 pin type insulator
 strain type

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 it is cheaper and lighter
 it is more conductive
 its tensile strength is more
 costlier

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Power Systems
The fact that current density is higher at the surface when compared to centre is known as

 skin effect
 proximity effect
All of these
 carona

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Power Systems
Telecommunication lines are transposed to reduce the

 voltage level
All of these
 radio interference in communication lines
 efficiency

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