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POWER SYSTEMS

Power Systems
The conductor carries more current on surface as compared to core. This is called as

 skin effect
 unsymmetrical fault
 corona effect
All of these

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Power Systems
Corona is accompanied by

 hissing sound
 violet visible light
All of these
 power loss and interference

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Power Systems
If sag in an overhead line increase, tension in the line

None of these
 increase
 decrease
 remains same

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Power Systems
By using guard ring in a transmission line, its string efficiency

None of these
 increase
 decrease
 remains unaffected

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Power Systems
Suspension type insulators are used for voltage beyond

 230 V
 33 kV
 11 kV
 440 V

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