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Power Systems

Power Systems
In a 3-phase, 5 kV, 5 MVA system, what is the base impedance?

 50 ohms
 500 ohms
 5 ohms
 0.5 ohm

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Power Systems
The insulation of modern EHV is designed based on

 RI.
 corona.
  switching voltage.
 lightning voltage.

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xs - Xm
 2Xs + Xm
 Xm - Xs
 Xs +2 Xm

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 it is cheaper and lighter
 it is more conductive
 its tensile strength is more
 costlier

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Power Systems
Operating cost of thermal power station is

 is the same as that of nuclear power plant.
 less than that of nuclear power plant.
 less than that of hydroelectric power plant.
  less than that of diesel power plant.

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Power Systems
Critical disruptive voltage is a voltage at which

 corona is visible with blue or violet colour
 nether 1 nor 2
 both 1 and 2
 corona is just initiated

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