11.An airport has 4 gates. If the weighted average gate occupancy time is 30 minutes and gate utilisation factor is 0.5, then the capacity of the gate will be

12.As per ICAO, for A, B, and C type of airports, maximum effective, transverse and longitudinal grades in percentage respectively are

13.The slope of the obstruction clearance line from the boundary of the heliport should be

14.In Intrumental landing system, the middle markers are located

15.The width and interval of transverse centre line bars along the extended centre line of runway, in approach lighting system are