Airport Engineering
Airport elevation is the reduced level above M.S.L. of

Control tower
Lowest point of the landing area
None of these
Highest point of the landing area

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Airport Engineering
Effective length of a runway is the distance between

Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway
Ends of the clear way on either side
Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway
Ends of the runway

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