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Power Systems

Power Systems
Which of following materials can be used as coolant

 Heavy water.
  Any of above.
 CO2.
 Helium.

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Power Systems
The use of high speed circuit breakers

 reduces the short circuit current.
 increased the short circuit current.
 decrease system stability.
  improves system stability.

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Power Systems
The characteristic impedance of a transmission line is

 Inversely proportional to square root of its length.
 Directly proportional to square root of its length.
 Independent of its length.
 Directly proportional to its length.

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Power Systems
A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. What is the reserve capacity of the plant?

 7500 kW
 3750 kW
 3000 kW
 6000 kW

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Power Systems
Bonding is done at the both ends of the cable to reduce the

None of these
 sheath loss
 iron loss
 copper loss

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Power Systems
When bundle conductor are used in place of single conductor the effective inductance and capacitance will respectively

 increase and decrease.
  decrease and increase.
 decrease and remain unaffected.
 increase and remain unaffected.

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