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Power Systems

Power Systems
A 3 layer and diameter of each strand is d, then find the total diameter of ACSR conductor?

 2d
 5d
 3d
 d

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.45 pu
 0.25 pu
 0.15 pu
 0.05 pu

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Power Systems
The function of reflector is to

 reduce the speed of the neutrons.
 stop the chain reaction.
 none of above.
  bounce back most of the neutrons that escape from the fuel core.

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Power Systems
Plug setting of a relay can be altered by varying

 no. of ampere-turns.
 air gap of magnetic path.
 adjustable back up stop.
 none of these.

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Power Systems
A thermal protection relay provides protection against what?

 Temperature
 any of the above
 Short circuit
 Over load

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Power Systems
Mho relay is used for the protection of

 short length lines.
 medium length lines.
  long transmission lines.
 no length criterion.

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