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Power Systems

Power Systems
Reflector of a nuclear reactor are made up of

  beryllium.
 cast iron.
  boron.
 steel.

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Power Systems
When a neutral point of 3 - Φ system is directly connected to earth then it has what type of grounding?

  Resistance.
  Peterson coil.
  Reactance.
  Solid.

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 0.2 pu
 2.4 pu
 3.975 pu
 1.375 pu

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Power Systems
One fission of U235 releases energy of

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

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Power Systems
Isolator in sub station is open under ------------- condition?

 full load
 no load
 any of the above
 short circuit

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Power Systems
Mho relay is usually employed for protection of

 any line
 medium transmission lines only
 long transmission lines only
 short transmission lines only

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