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Power Systems

Power Systems
Most commonly used material for insulator is

All of these
 glass
 porcelain
 mica

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Power Systems
Breaking current is a ------------------ value?

 any of the above
 maximum
 RMS
 average

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Power Systems
A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

 -6.92%
 6.92%
 -10%
 10%

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 33 Ω
 28 Ω
 52 Ω
 40 Ω

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Power Systems
Which type of connection is employed for current transformers for the protection of star- delta connected 3-phase transformer?

 star-delta
 star-star
 delta-delta
 delta-star

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Power Systems
In thermal plant most of the energy is wasted in

 turbines
 ESP
 condenser
 boiler

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