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CPL Test Series
Question Bank
Questions for ADF
Answer the following questions
Test Mode
Training Mode
1. In order to resolve the 180° directional ambiguity of a directional LOOP aerial its polar diagram is combined with that of a SENSE aerial ................................ to produce a............... whose single null ensures the ADF needle moves the shortest distance to indicate the correct................
at the transmitter, limacon, bearing.
at the aircraft, limacon, bearing.
at the aircraft, cardioid, radial.
at the aircraft, cardioid, bearing.
2. When flying over the sea and using an inland NDB to fix position with a series of position lines, the plotted position in relation to the aircraft's actual position will be
further from the coast.
inaccurate due to the transmitted wave front decelerating.
co-incident
closer to the coast.
3. The ADF of an aircraft on a heading of 189°(T) will experience the greatest effect due to Quadrantal Error if the NDB bears
279°(T)
234°(T)
145°(T)
225°(T)
4. The BFO facility on ADF equipment should be used as follows when an NDB having NON A1A type emission is to be used
BFO off during tuning, identification and monitoring because this type of emission is not modulated.
BFO on for tuning and identification but may be turned off for monitoring.
BFO should be switched on for tuning, ident and monitoring.
BFO on for tuning but can be turned off for monitoring and identification purpose.
5. The magnitude of the error in position lines derived from ADF bearings that are affected by coastal refraction may be reduced by
choosing beacons on or near the coast.
selecting beacons situated well inland
only using beacons within the designated operational coverage.
choosing NON A2A beacons.
6. Each NDB has a range promulgated in the COMM section of the Air Pilot. Within this range interference from other NDBs should not cause bearing errors in excess of
night ± 5
day ± 6
day ± 5
night ± 10
7. When the induced signals from the loop and the sense antenna are combined in an ADF receiver, the resultant polar diagram is
circular
a limacon
figure of eight shaped
a cardioid
8. The range promulgated in the Air Pilot and flight guides for all NDBs in the UK is the range
Within which a protection ratio of 3:1 is guaranteed by day and night
Within which protection from skywave protection is guaranteed.
Within which bearings obtained by day should be accurate to within 5°.
Up to which bearings can be obtained on 95% of occasions.
9. In order to Tune, Identify and Monitor NON A1A NDB emissions the BFO should be used as follows
Tune on Identify on Monitor off
Tune on Identify off Monitor off
Tune on Identify on Monitor On
10. The overall accuracy of ADF bearings by day within the Promulgated Range (DOC) is
± 10°
± 3°
± 6°
± 5°
11. The protection ratio afforded to NDBs in the UK within the Promulgated range(DOC) applies
by day only.
both day and night.
at dawn and dusk.
by night only.
12. An aircraft is intending to track from NDB ‘ A' to NDB ‘B' on a track of 050° (T), heading 060° (T). If the RBI shows the relative bearing of ‘ A' to be 180° and the relative bearing of ‘B' to be 330° then the aircraft is
Starboard of track and nearer ‘ A'
Port of track and nearer ‘ A'.
Starboard of track and nearer ‘B'.
Port of track and nearer ‘B'.
13.
An aircraft has an RMI with two needles. Assume that: i) The aircraft is outbound from NDB Y on a track of 126°(M) drift is 140° Port. ii) A position report is required when crossing a QDR of 022 from NDB Z. Which of the diagrams below represents the RMI at the time of crossing the reporting point?
B
C
A
D
14. The phenomenon of coastal refraction which affects the accuracy of ADF bearings
can be minimised by using beacons situated well inland.
is most marked one hour before to one hour after sunrise and sunset.
can be minimised by taking bearings where the signal crosses the coastline at right angles.
is most marked at night.
15. In an ADF system, night effect is most pronounced
when the aircraft is at low altitude.
during long winter nights.
when the aircraft is at high altitude.
at dusk and dawn.
16. The principal propagation path employed in an NDB/ADF system is
direct wave
surface wave
ducted wave
skywave
17. The phenomena of coastal refraction affecting ADF bearings is caused by the signal _______ when it reaches the coastline and bending _______ the normal to the coast:
accelerating away from
accelerating towards
decelerating away from
decelerating towards
18. ADF Quadrantal Error is caused by
the aircraft's major electrical axis, the fuselage, reflecting and re-radiating the incoming NDB transmissions.
station interference and/or night effect.
static build up on the airframe and St. Elmo's Fire.
NDB signals speeding up and bending as they cross from a land to water propagation path
19. The Protection Ratio of 3:1 that is provided within the Promulgated range/Designated Operational Coverage of an NDB by day cannot be guaranteed at night because of
Long range skywave interference from other transmitters.
Skywave signals from the NDB to which you are tuned.
The possibility of sporadic E returns occurring at night.
The increased skip distance that occurs at night.
20. An aircraft on a heading of 235°(M) shows an RMI reading of 090° with respect to an NDB. Any quadrantal error which is affecting the accuracy of this bearing is likely to be
a maximum value.
zero, since quadrantal error affects only the VOR.
zero, since quadrantal error affects only the RBI.
a very small value.
21.
An aircraft is tracking away from an NDB on a track of 023°(T). If the drift is 8° port and variation 10° west, which of the RMIs illustrated below shows the correct indications?
A
C
B
D
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