Automatic Direction Finder: DGCA Air Navigation questions

Question 1

The phenomenon of coastal refraction which affects the accuracy of ADF bearings:

Accepted Answer

can be minimized by taking bearings where the signal crosses the coastline at right angles

Answer

is most marked at night

Answer

can be minimized by using beacons situated well inland

Answer

is most marked one hour before to one hour after sunrise and sunset

Question 2

An aircraft is intending to track from NDB A to NDB B on a track of 050 degrees True, heading 060 degrees True. If the RBI shows the relative bearing of A to be 180 degrees and the relative bearing of B to be 330 degrees then the aircraft is:

Accepted Answer

starboard of track and nearer B

Answer

port of track and nearer A

Answer

port of track and nearer B

Answer

starboard of track and nearer A

Question 3

ADF quadrantal error is caused by:

Accepted Answer

the aircraft's major electrical axis, the fuselage, reflecting and re-radiating the incoming NDB transmissions

Answer

static build up on the airframe and St Elmo's Fire

Answer

station interference and/or night effect

Answer

NDB signals speeding up and bending as they cross from a land to water propagation path

Question 4

The overall accuracy of ADF bearings by day within the promulgated range (DOC) is:

Accepted Answer

plus or minus 5 degrees

Answer

plus or minus 3 degrees

Answer

plus or minus 6 degrees

Answer

plus or minus 10 degrees

Question 5

In order to Tune, Identify and Monitor N0NA1A NDB emissions the BFO should be used as follows: Tune, Identify, Monitor

Accepted Answer

On, On, On

Answer

On, On, Off

Answer

On, Off, Off

Answer

Off, Off, Off

Automatic Direction Finder: DGCA Air Navigation questions

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