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Power Systems

Power Systems
Uses of diesel power stations

  emergency plants.
  peak load plant.
All of these
 standby plants.

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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

 9.936 pu
 7.936 pu
 10.936 pu
 8.936 pu

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Power Systems
With reference to hydrometer station, the graphical representation of the discharge as function of time is known as

 Hectograph.
 Monograph.
  Hydro-graph.
 Load duration curve.

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Power Systems
Which of the following statements is/are true? Corona is reduced by

All of these
 increasing the distance between the conductor
 increasing the radius of the conductor
 decreasing the supply frequency

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Power Systems
A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

 1 A.
 1.476 A.
  14.76 A.
 14.7 mA.

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Power Systems
In a thermal power plants, pressure in the working fluid cycle is developed by

 condenser.
  feed water pump.
 turbine.
 superheater.

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