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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 three
 one
 two
 six

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Power Systems
Electrostatic precipitators in thermal power plants are used for

 control flow rate
 removal of ash from flue gas
 remove moisture from the cole
All of these

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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?

 2 mH
 2 H
 15.9 H
 15.9 mH

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Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 78%
 76%
 80%
 82%

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Power Systems
Telecommunication lines are transposed to reduce the

 voltage level
 efficiency
 radio interference in communication lines
All of these

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

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

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