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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
For 66 kV lines the number of insulator discs of each 11 kV used are

 3
 5
 6
 12

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Power Systems
Operating time of pumped storage plant is

 very high
 can't say
 low
 high

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.075 pu.
 0.125 pu.
 0.200 pu.
  3.000 pu.

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Power Systems
Maximum power transfer capability of transmission line can be increased by

 Parallel transmission lines
All of these
 Using series capacitance
 Using bundled conductors

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Power Systems
Attenuation occurs due to

 resistance
 inductance
 conductance
 both 1 and 3

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