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Power Systems

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?

 8
 2
 5
 4

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

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

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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
Pin insulators are used up to

 120 kV
 33 kV
 any voltage level
 11 kV

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Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Bulk oil type CB
 Air blast CB
 Sulphur hexafluoride CB
 Vacuum CB

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Power Systems
A transmission line is operating under no load has ABCD parameters B = 100∠90° has a phase shift of 0.2 rad, how much shunt reactor is required for compensation of ferranti effect?

 15.9 H
 2 mH
 2 H
 15.9 mH

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