Airport Engineering
According to the International Civil Aviation Organization (I.C.A.O.), the runway lengths of aerodromes, have been coded by

Seven English alphabets
Last Seven English alphabets
First Seven English alphabets
First seven natural numbers

ANSWER DOWNLOAD EXAMIANS APP

Airport Engineering
Effective length of a runway is the distance between

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 clear way on either side
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 runway

ANSWER DOWNLOAD EXAMIANS APP