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Power Systems

Power Systems
Transmission line parameters of the short transmission line are

 1,Z,Y,1
 1,Z,0,1
 1,0,Y,1
 Z,0,Y,1

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Power Systems
The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

 7 A.
 10 A.
  6 A.
 8 A.

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Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

 10.
 20.
 55.1.
  5.

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Power Systems
Main bus bar protection scheme is /are

  differential protection.
  both fault bus and differential protection.
  none of these.
  fault bus protection.

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

 lagging.
 unity.
  leading.
 zero.

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Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 4
 5
 2
 8

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