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Power Systems

Power Systems
Which of following materials can be used as coolant

 Helium.
 CO2.
  Any of above.
 Heavy water.

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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?

 1.476 A.
 14.7 mA.
  14.76 A.
 1 A.

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Power Systems
Making current is a------------ value?

 average
 peak value
 any of the above
 RMS

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Power Systems
Under over excitation synchronous phase modifier works as

 shunt capacitor
 any of the above
 series capacitor
 shunt reactor

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

 low alternative efficiency.
 low steam turbine mechanical efficiency.
  high energy loss from turbine exhaust to condenser.
 high energy loss in boiler.

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Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 Synchronous line
 Asynchronous line
 both 1 and 2
 No need of same frequency for exchange of power

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