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Power Systems

Power Systems
Which of following materials can be used as coolant

 Helium.
 Heavy water.
  Any of above.
 CO2.

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Power Systems
For 800 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a 50 Hz, four pole turbo generator rated 100 MVA, 11 kV?

 6 MJ/MVA
 8 MJ/MVA
 2 MJ/MVA
 4 MJ/MVA

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Power Systems
The rate of rise of restricting voltage depends upon the

 Inductance of the system.
  Inductance and capacitance of the system.
 Capacitance of the system.
 Type of CB.

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Power Systems
A transmission line is operating under no load has ABCD parameters B = 100∠90° has a phase shift of 0.2 rad, how much shunt reactor is required for compensation of ferranti effect?

 2 mH
 15.9 mH
 2 H
 15.9 H

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Power Systems
The most commonly used material for insulators of overhead lines is

 glass
 PVC
 mica
 porcelain

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Power Systems
Power transmission lines are transposed to reduce

 ferranti effect
 proximity effect
 radio interference
 skin effect

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