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Power Systems

Power Systems
Find the number of strands of ACSR conductor for 4 layer transmission line?

 29
 7
 37
 1

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Power Systems
The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers)

 N = 3x²-6x+1
 N = 3x²+3x+1
 N = 3x²-2x+1
 N = 3x²-3x+1

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Power Systems
In thermal power stations, economiser will

 reduce the thermal efficiency
 increase the thermal efficiency
 both 2 and 3
 reduce the heat

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 in phase opposition with the arc current.
 lagging the arc current by 90°.
 leading the arc current by 90°.
  in phase with the arc current.

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Power Systems
Bundled conductors in EHV transmission lines

 decrease inducatance
 increase inductance
 decrease capacitance
 increase capacitance

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Power Systems
Length of short transmission line is up to

 40 km
 150 km
 80 km
 any of the above

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