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Power Systems

Power Systems
Condition for zero voltage regulation is

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

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Power Systems
Lightning arresters are used for

 protection of equipment from short circuits
 protection of equipment from external lightning
All of these
 protection of equipment from open circuits

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Power Systems
For load flow studies, What are the quantities specified at load bus are

 P and Q
 V and δ
 δ and Q
 P and V

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Power Systems
Which of the following relays are used in protection of medium transmission lines?

 Impedance relays
 Mho relays
 Admittance relays
 any of the above

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Power Systems
Radio interference occur in telecommunication line due to

 nether 1 nor 2
 electro static induction
 both 1 and 2
 electro magnetic induction

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

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

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