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Power Systems

Power Systems
One fission of U235 releases energy of

  200 MeV.
 525 MeV.
 435 MeV.
 335 MeV.

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Power Systems
Where air circuit breakers are used?

  Up to 66 kV.
  Up to 12 kV.
  Up to 33 kV.
  Up to 11 kV.

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 22.5 electrical degrees/s²
 225 electrical degrees/s²
 12.5 electrical degrees/s²
 125 electrical degrees/s²

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

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

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Power Systems
If a generator of 250 MVA rating has an inertia constant of 6 MJ/MVA, its inertia constant on 100 MVA base is

 2.5 MJ/MVA
 15 MJ/MVA
 10.5 MJ/MVA
 6 MJ/MVA

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Power Systems
A 1-phase transmission line has an impedance (4 + 3j ) Ω. Find the power factor of the load for zero voltage regulation?

 0.6 lag
 0.8 lag
 0.6 lead
 0.8 lead

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