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Power Systems

Power Systems
For flat voltage profile system, voltage regulation is

 100%
 any of the above
 50%
 0%

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Power Systems
Critical visual voltage is the voltage at which

 both 1 and 2
 corona is visible with blue or violet colour
None of these
 corona is just initiated

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.5 pu, Zm =0.6 pu
 Zs = 0.6 pu, Zm =0.5 pu

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Power Systems
Demand factor of a plant is

 0
 1
 less than 1
 greater than 1

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Power Systems
What are the methods of laying underground cables?

 Direct laying.
 Draw - in - system / duct - pipe laying.
  Both A and B.
 None of these.

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Power Systems
The characteristic impedance of a transmission line is

 Directly proportional to square root of its length.
 Independent of its length.
 Directly proportional to its length.
 Inversely proportional to square root of its length.

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