Airport Engineering
According to I.C.A.O. the recommended length of air ports is decided on

All listed here
Sea level elevation
Effective gradient percentage
Standard sea level temperature (15°C)

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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
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
Ends of the runway

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Airport Engineering
Assertion A : Airport capacity during IFR conditions is usually less than that during VFR conditions.Reason R: During clear weather condition (VFR), the aircrafts on final approach to runway can be spaced closer during poor visibility conditions.Select your answer based on the coding system given below:

A is true but R is false
A is false but R is true
Both A and R is true but R is not the correct explanation of A
Both A and R is true and R is the correct explanation of A

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Airport Engineering
The capacity of parallel runway pattern depends upon

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

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