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Power Systems

Power Systems
Which of following materials can be used as coolant

 CO2.
 Heavy water.
  Any of above.
 Helium.

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Power Systems
If a 500 MVA, 11 kV 3-phase generator at 50 Hz feeds through a transfer impedance of (0+j0.605) Ω/phase, an infinite voltage also at 11 kV, then the maximum steady state power transfer on the base of 500 MVA and 11 kV is

 1 pu
 0.4 pu
 0.8 pu
 0.5 pu

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Power Systems
The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

 A resistance of 100/3 ohm.
 A resistance of j300 ohm.
 A resistance of 100 ohm.
 A resistance of j100/3 ohm.

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Power Systems
Range of accelerating factor is

 1.6 to 1.8
 1 to 10
 50 to 100
 10.8 to 11.2

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 86%%
 75%
 90%
 50%

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Power Systems
A thermal generating station has an installed capacity of 15 MW and supplies a daily load of 10 MW for 12 hours and 5 MW for remaining 12 hours. The plant capacity factor for the station is

 0.5
 0.6
 0.75
 1

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