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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
Find the propagation constant, if impedance is 10Ω and admittance is 10 â„§?

 5
 100
 1
 10

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Power Systems
The insulation of the modern EHV lines is designed based on

 corona.
 the lighting voltage.
 R × I.
  the switch voltage.

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Power Systems
A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage?

 36 kV
 45 kV
 32 kV
 40 kV

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Power Systems
The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

 7 A.
 8 A.
 10 A.
  6 A.

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Power Systems
Which of following generating plants has the minimum operating cost

 Hydroelectric plant.
 Diesel plant.
 Nuclear plant.
 Steam plant.

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