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Power Systems

Power Systems
Which of the following materials is/are used as moderators?

 heavy water
 beryllium
 graphite
All of these

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Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Decrease but does not halves.
  Increase but does not doubled.
 Halves.
 Doubled.

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Power Systems
Apart from the skin effect the non uniformity of the current distribution is also caused by

 ferranti effect
All of these
 bundled conductors
 proximity effect

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Power Systems
India 1st nuclear plant was set up at

  Kalpakkam.
  Bhaba.
  Tarapur.
  Rana pratap sagar.

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 22.5 electrical degrees/s²
 125 electrical degrees/s²
 12.5 electrical degrees/s²
 225 electrical degrees/s²

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Power Systems
The capacitance of an overhead transmission line increases with

 neither 1 nor 2
 both 1 and 2
 increase in height of conductors above ground
 increase in mutual geometrical mean distance

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