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Power Systems

Power Systems
Which of the following is used in thermal plants

 Joule cycle
 Otto cycle
All of these
 Rankine cycle

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Power Systems
The corona loss on a particular system at 50 Hz is 1 kW/km per phase. What is the corona loss at 60 Hz in kW/km per phase?

 1
 1.25
 0.89
 1.13

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

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

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Power Systems
In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using

 direct heat in the furnace.
 HP steam.
 LP steam.
  flue gas.

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Power Systems
Which of the following transformer is used in sub station for operating a protective relay?

 capacitor voltage transformer
All of these
 distribution transformer
 auto transformer

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Power Systems
Reflection coefficient of voltage is Rv

 (Zl - Zs)/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)
 2Zl/(Zs + Zl)
 2Zs/(Zs + Zl)

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