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Power Systems

Power Systems
Skin effect depends on

All of these
 relative permeability
 frequency
 conductivity

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Power Systems
A transmission line is compensated with shunt capacitance Csh. After shunt compensation surge impedance loading will

 increases
 decreases
None of these
 remains unaffected

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Power Systems
A guard ring is used in string type insulator having 3 units to improve string efficiency. Find the capacitance of metal link 2 if pin to earth capacitance of each unit is 1 F?

 4 F
 1 F
 2 F
 0.5 F

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Power Systems
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° â„§. The sending end voltage is 400 kV. The receiving end voltage under no load condition is

 350 kV
 500 kV
 600 kV
 400 kV

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

 capacitor voltage transformer
 distribution transformer
 auto transformer
All of these

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Power Systems
What are the methods of laying underground cables?

 Direct laying.
 None of these.
  Both A and B.
 Draw - in - system / duct - pipe laying.

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