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Power Systems

Power Systems
Lightning arresters are made up of which material?

 any of the above
 copper
 silicon oxide
 silver

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Power Systems
In what from the initial energy will be released for the 200 MeV per fission by a neutron in a slow thermal nuclear reactor

 electromagnetic radiations.
  kinetic energy of particles and electromagnetic radiation.
 kinetic energy and sound energy.
 heat energy.

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Power Systems
A fuse wire of circular cross-section has a radius of 0.8 mm. The wire blows off at an current of 8 Amp. Calculate the radius of wire that will blow off at an current of 1 amp?

 0.4 mm.
 4 mm.
  0.2 mm.
 2 mm.

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Power Systems
Water hamming process in pen-stocks results in

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

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Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

  200 : 5 / √3.
 150 : 4 / √3.
 120 : 6 / √3.
  100 : 5 / √3.

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Power Systems
Which one of following fuels is used by slow thermal nuclear reaction for power generation

 Pu239.
  U235.
 U238.
 Th232.

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