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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.
  Water.
  Liquid.
  Air.

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Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 both 1 and 2
 Rated voltage and frequency has to be supplied to the consumers
 nether 1 nor 2

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Power Systems
The insulation of modern EHV is designed based on

 RI.
  switching voltage.
 lightning voltage.
 corona.

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Power Systems
When is the ferranti effect on long overhead lines experienced?

 The line is heavily loaded
 The power factor is unity
 The line is fully loaded
 The line is lightly loaded

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Power Systems
The characteristic impedance of a transmission on line is

 Inversely proportional to its length.
  Independent of its length.
 Directly proportional to square root of its length.
 Directly proportional to its length.

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Power Systems
A transmission line has a surge impedance of 400 Ω for a length of the line of 200 km. If the length of line is increased to 400 km, then its surge impedance is

 800 Ω
 0 Ω
 400 Ω
 200 Ω

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