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POWER SYSTEMS

Power Systems
In a transmission line the insulators to be used at the dead end or sharp curves are

 strain type
 pin type insulator
 suspension type
 any of the above

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Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 3
 12
 6
 5

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Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 0.93
 1
 1.13
 0.882

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Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

 1000
 0.1
 10
 0.001

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Power Systems
A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage?

 45 kV
 36 kV
 40 kV
 32 kV

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