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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = R/X
 tanφ = X/R
 cosφ = X/R
 cosφ = R/X

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Power Systems
Corona is accompanied by

 hissing sound
All of these
 violet visible light
 power loss and interference

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Power Systems
In hydro power stations what is an enlarged body of water just above the intake and used as a regulating reservoir called

 Reservoir.
  Fore bay.
 Penstock.
 Spillways.

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Power Systems
Which of the following plants has the maximum eapital cost

 Steam plants.
 Hydro-plants.
 Diesel plants.
  Nuclear plants.

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Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 250
 450
 500
 900

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Power Systems
The presence of earth in case of overhead lines

 decrease inducatance
 increase inductance
 increase capacitance
 decrease capacitance

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