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Power Systems

Power Systems
One atomic mass unit is equivalent to

  931.4 MeV.
 180.5 MeV.
 251.2 MeV.
 120.4 MeV.

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Power Systems
A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time?

 -0.76 Hz
 0.76 Hz
 0.85 Hz
 -0.85 Hz

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Power Systems
One Kg of natural uranium gives energy equivalent to about

 100 Kg of coal.
 5000 Kg of coal.
  10500 Kg of coal.
 1000 Kg of coal.

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Power Systems
Which type of connection is employed for current transformers for the protection of delta- star connected 3-phase transformer?

 star-delta
 delta-star
 delta-delta
 star-star

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Power Systems
Water hamming process in pen-stocks results in

None of these
  noise increases.
  pressure increases.
  noise increases, pressure increases, velocity decreases.

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 41.075 kV/phase
 34.64 kV/phase
 17.32 kV/phase
 82.15 kV/phase

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