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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Vacuum CB
 Bulk oil type CB
 Air blast CB
 Sulphur hexafluoride CB

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Power Systems
The skin effect of conductor will increase when

 diameter decrease
 resistivity decrease
 frequency decrease
All of these

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Power Systems
A 3-phase, 110 kV coaxial XLPE insulated power cable delivering power at 50 Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2*10^-4, then dielcetric power loss in this cable in W/km/phase is

 38.6
 35.45
 23.9
 31.7

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Power Systems
Which of the following is not base load power plant

  Diesel.
  Pump storage.
  Run water.
  Nuclear.

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

 50 kA.
  35 kA.
 55 kA.
 45 kA.

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