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Power Systems

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

 power factor
 current
 voltage
 reactive power

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Power Systems
For symmetrical network, the neutral current is

 any of the above
 infinity
 zero
 maximum

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Power Systems
A steam power generation has an overall efficiency of 20 %. 0.6 Kg of coal is burnt per kWh of electrical energy generated. Calculated the calorific value of fuel

 7000 KCal / Kg.
 7562 KCal / Kg.
 7268.45 KCal / Kg.
  7166.67 KCal / Kg.

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 83.76 kV
 20 kV
 48.36 kV
 52.84 kV

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Power Systems
One atomic mass unit is equivalent to

  931.4 MeV.
 180.5 MeV.
 251.2 MeV.
 120.4 MeV.

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Power Systems
The positive sequence reactance will be equal to negative sequence if the equipment is

  motor.
  generator.
  transformer and transmission lines.
  none of these.

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