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Power Systems

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

 3
 12
 5
 6

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j6 pu
 j1 pu
 j3 pu
 j9 pu

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Power Systems
What are the tests performed for oil-filled and gas-filled cables ?

 Thermal stability test.
  All of these.
 Load cycle tests.
 Impulse tests.

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Power Systems
The radiation shield for a nuclear power reactor for biological safety is provided by having the reactor

 immersed in water pool.
 isolated from outside word with strong magnetic field.
  encased by thick concrete wall.
 encased thick metal wall.

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Power Systems
Which of the following power plants can generate power at unpredictable or uncontrollable time

 Wind turbine.
 Cooling tower.
 Pulverising unit.
 Condenser.

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Power Systems
For loss less line, find the ratio of length to the wave length of a signal for a phase shift of 0.05 radians?

 8 × 10³
 7.95 × 10³
 7.95 × 10-3
 2 × 10-3

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