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Power Systems

Power Systems
Reflector of a nuclear reactor are made up of

  beryllium.
  boron.
 cast iron.
 steel.

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Power Systems
Maximum power capacity of a transmission line can be increased by

 either 1 or 2
 nether 1 nor 2
 increasing voltage level
 decreasing reactance value

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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
 2.63 msec
 9.68
 4.68 msec

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Power Systems
Recovery voltage in CB is equal to

  arcing period voltage.
  none of these.
  transient voltage.
  normal frequency 50 Hz rms voltage.

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Power Systems
Surge impedance loading of a transmission line can be increased by

 addition of lumped inductance in parallel
 addition of lumped capacitance in series
 both 1 and 3
 increasing its voltage level

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Power Systems
What are the tests performed for oil-filled and gas-filled cables ?

 Load cycle tests.
 Impulse tests.
 Thermal stability test.
  All of these.

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