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Power Systems

Power Systems
Which of following materials can be used as coolant

 Helium.
 CO2.
 Heavy water.
  Any of above.

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Power Systems
In relay coil which is used?

  Potential transformer.
  Current transformer.
  Power transformer.
  Instrument transformer.

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Power Systems
Direct conversion of heat energy into electrical energy is possible through

 MHD generator.
 Both A and C.
 Thermal converters.
 Fuel or solar cell.

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Power Systems
Advantages of higher transmission voltage is/are

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

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Power Systems
A transmission line has a reactance of 1 Pu is operating at Vs = Vr = 1 Pu. The generator is connected at source end which is delivering 0.5 Pu of active power and the transmission line is compensated with a series capacitance of 0.5 Pu. Find the load angle with series capacitance compensation ?

 35.5°
 14.5°
 29°
 10.5°

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Power Systems
Steady state stability of a power system is improved by

 single pole switching
 decreasing generator inertia
All of these
 using double circuit line instead of single circuit line

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