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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
If a fault occurs on any feeder, the fault current is

  equal to unsectional bus bar.
  much higher than with unsectional bus bar.
  none of these.
  much lower than with unsectional bus bar.

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Power Systems
Pelton turbine is a ----------- turbine

 any of the above
 inward radial flow
 axial flow
 impulsive

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Power Systems
Transmission line parameters of the short transmission line are

 Z,0,Y,1
 1,Z,0,1
 1,0,Y,1
 1,Z,Y,1

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 52.84 kV
 20 kV
 83.76 kV
 48.36 kV

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Power Systems
The presence of earth in case of overhead lines

 increase inductance
 decrease inducatance
 decrease capacitance
 increase capacitance

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