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Power Systems

Power Systems
Which of following materials can be used as coolant

 CO2.
 Helium.
 Heavy water.
  Any of above.

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Power Systems
The specific speed ( NS ) of turbine is given by

  N√( P ) / H1.25.
 P√( N ) / H3/2.
 N√( P ) / H2/3.
 none of these.

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Power Systems
Under over excitation synchronous phase modifier works as

 shunt reactor
 shunt capacitor
 series capacitor
 any of the above

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Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

 10.
 20.
  5.
 55.1.

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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?

 14.7 mA.
 1 A.
 1.476 A.
  14.76 A.

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Power Systems
Surge impedance loading of a line is increased by which of the following compensation methods?

 both 1 and 2
 shunt capacitor
 shunt reactor
 series capacitor

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