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Power Systems

Power Systems
The insulator thickness on the conductor, in cables depends upon

 voltage
 reactive power
 current
 power factor

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Power Systems
Corona is accompanied by

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

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Power Systems
For variable heads of near about but less than 30 m, which type of turbines is used hydro power plant

  Kaplan.
 None of above.
 Francis.
 Pelton.

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Power Systems
In a thermal power plant, which of its following components needs maximum maintenance attention

 Super heater.
 Steam turbine.
 Boiler.
 Condenser.

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 8.936 pu
 10.936 pu
 9.936 pu
 7.936 pu

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Power Systems
Surge tank is kept very close to the

 pen stock
 spill way
 generator
 turbine

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