DGCA Air Navigation question paper, December 2024

Question 1

Civil twilight is bounded by which position of the sun?

Accepted Answer

Centre of the sun 6 degrees below the celestial horizon

Answer

Upper edge of the sun just touching the horizon

Answer

Centre of the sun 18 degrees below the celestial horizon

Question 2

Evening civil twilight lasts over what interval?

Accepted Answer

From sunset until the sun's centre is 6 degrees below the true horizon

Answer

From sunset until the sun's upper edge is 6 degrees below the visual horizon

Answer

From sunset until the sun's centre is 12 degrees below the true horizon

Answer

From sunset until the sun's centre is 6 degrees below the visual horizon

Question 3

Geodetic and geocentric latitude differ because the Earth is not a perfect sphere. What is the largest difference and where does it occur?

Accepted Answer

11.6 minutes of arc, at latitude 45 degrees

Answer

11.11 minutes of arc, at the equator

Answer

6.11 minutes of arc, at the poles

Question 4

On an airway segment of an en route chart the figures 5000 and 2900a appear together. What does the 5000 stand for?

Accepted Answer

Minimum en route altitude (MEA)

Answer

Maximum authorised altitude (MAA)

Answer

Minimum holding altitude (MHA)

Answer

Lower limit of the airway

Question 5

An aircraft at low level over the sea takes NDB bearings. In which case is the coastal refraction error largest?

Accepted Answer

Beacon well inland, with the bearing meeting the coastline at a shallow angle

Answer

Beacon well inland, with the bearing meeting the coastline at a right angle

Answer

Beacon on the shoreline, with the bearing meeting the coastline at a shallow angle

Answer

Beacon on the shoreline, with the bearing meeting the coastline at a right angle

36 more questions in this paper, free with an account.