Airport Engineering
Zero fuel weight of an aircraft is:

Equal to sum of empty operating weight and the maximum pay load
Equal to maximum landing weight
Equal to empty operating weight
Less than empty operating weight

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Airport Engineering
Wing loading of an aircraft is

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

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Airport Engineering
The capacity of parallel runway pattern depends upon

Lateral spacing between two runways and weather conditions
Weather conditions and navigational aids available
Lateral spacing between two runways, weather conditions and navigational aids available.
Lateral spacing between two runways and navigational aids available

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