Airport Engineering
In Instrumental landing system, the middle markers are located

Along the extended centre line of runway end
At the runway threshold
About 1 km. ahead of the runway threshold
About 7 km. ahead of the runway threshold

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Airport Engineering
Wing loading of an aircraft is

Gross total weight of the aircraft/ load of the wings
Load of the wings
Gross total weight of the aircraft/total available H.P of engines
Gross total weight of the aircraft/ wing area

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