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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Liquid.
  Water.
  Air.
  Hydrogen.

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

 maximum horse power.
 unit horse power at all heads.
 a minimum horse power.
  unit horse power at unit head.

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Power Systems
Which of the following represents the sag(S) of a transmission line?

 S = wl²/2T
 S = wl²/4T
 S = wl²/8T
 S = wl²/16T

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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.
 Doubled.
 Halves.
  Increase but does not doubled.

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Power Systems
In a thermal power plant, which of its following components needs maximum maintenance attention

 Super heater.
 Boiler.
 Condenser.
 Steam turbine.

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Power Systems
Bundled conductors are used for EHV transmission lines primarily for reducing the

 voltage drop across the line
 copper loss
 corona loss
 surge impedance of the line

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