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Power Systems

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

  Hydrogen.
  Liquid.
  Air.
  Water.

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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.

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

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Power Systems
A thermal generating station has an installed capacity of 15 MW and supplies a daily load of 10 MW for 12 hours and 5 MW for remaining 12 hours. The plant capacity factor for the station is

 0.5
 0.6
 1
 0.75

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Power Systems
A hydroelectric power station is commonly found in

  hilly areas.
 desert areas.
 swamps.
 grasslands.

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Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

 this may either be a medium line or short line
 this expression is true for any line
 this must be a short line
None of these

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Power Systems
Earthing switch is used for

 discharging residual energies
 protection of equipment from ground faults
 measuring of safety voltage
All of these

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