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

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

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Airport Engineering
Castor angle is defined as the angle

Between the true speed of the aircraft and the crosswind component
Between the horizontal and the fuselage axis
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
Between the direction of wind and the longitudinal axis of the runway

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