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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LLG
 LG
 LLL
 LL

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Power Systems
A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is

 66.66%
 25%
 75%
 33.33%

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Power Systems
Advantages of higher transmission voltage is/are

 Power transfer capability of the transmission line is increased
 Area of cross section and volume of the conductor is reduced
 Transmission line losses are reduced
All of these

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Power Systems
A transmission line has surge impedance of 400 Ω, operating at Vs = Vr = 400 kV line is compensated with a shunt capacitance of 30%. The line is connected to a generator delivering 200 MW. Find the load angle with out and with compensation respectively?

 30° and 45°
 45° and 26°
 26° and 30°
 30° and 26°

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Power Systems
Telecommunication lines are transposed to reduce the

All of these
 radio interference in communication lines
 voltage level
 efficiency

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Power Systems
For accurate load flow calculations on large power systems, the best method is

All of these
 N-R method
 G-S method
 Decoupled method

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