Airport Engineering
The landing and takeoff of the air craft is made against the direction of wind. In no case the centre line of the runway should make an angle with the wind direction exceeding

30°
40°
10°
20°

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Airport Engineering
Effective length of a runway is the distance between

Ends 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
Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway

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