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Power Systems

Power Systems
The most commonly used material for insulators of overhead lines is

 porcelain
 PVC
 glass
 mica

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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?

 2.63 msec
 9.68
 4.68 msec
 1.47 msec

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Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 13
 21
 10
 20

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Power Systems
Bundled conductors in EHV transmission lines

 increase inductance
 decrease capacitance
 decrease inducatance
 increase capacitance

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Power Systems
In relay coil which is used?

  Instrument transformer.
  Current transformer.
  Potential transformer.
  Power transformer.

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?

 SF6 CB.
 Oil CB.
 Air blast CB.
  Vacuum CB.

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