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Power Systems

Power Systems
Reflector nuclear reactor are made of

 boron.
 steel.
  beryllium.
 cast iron.

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Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

 0.92
 -0.92
 -0.56
 0.56

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Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 0
 AD - BC = -1
 AD + BC = 0
 AD - BC = 1

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Power Systems
Critical disruptive voltage is a voltage at which

 both 1 and 2
 corona is visible with blue or violet colour
 nether 1 nor 2
 corona is just initiated

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Power Systems
The sequence components of the fault current are as follows : Ipositive = j1.5 pu, Inegative = − j0.5 pu, Izero = − j pu Which fault is this?

  LL.
  LLG.
  LG.
  LLLG.

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Power Systems
One atomic mass unit is equivalent to

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

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