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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 0
 1
 α
 α²

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Power Systems
A 20 MVA generator has inertia constant of 0.5 pu. Find new value for 50 MVA base?

 0.1 pu
 0.4 pu
 0.5 pu
 0.2 pu

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

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

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

 Zs*√(1 + Kcsh)
 √(1 + Kcsh)/Zs
 Zs/√(1 + Kcsh)
All of these

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Power Systems
Which of the following statements is/are true? Corona is reduced by

All of these
 decreasing the supply frequency
 increasing the distance between the conductor
 increasing the radius of the conductor

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Power Systems
Cheapest plant in operation and maintenance is

  hydroelectric.
  diesel power.
  nuclear.
  steam power.

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