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Power Systems

Power Systems
Reflector nuclear reactor are made of

  beryllium.
 steel.
 cast iron.
 boron.

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm cosωt?

 1.47 msec
 9.68
 4.68 msec
 2.63 msec

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Power Systems
With reference to hydrometer station, the graphical representation of the discharge as function of time is known as

 Hectograph.
 Load duration curve.
  Hydro-graph.
 Monograph.

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Power Systems
Which of following materials can be used as coolant

 Heavy water.
  Any of above.
 CO2.
 Helium.

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Power Systems
The fact that current density is higher at the surface when compared to centre is known as

 proximity effect
 carona
All of these
 skin effect

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Power Systems
Which cooling is preferred for large turbine generator

  Nitrogen cooling.
  Hydrogen cooling.
  None of these.
  Oxygen cooling.

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