AUTOMATIC DIRECTION FINDER (ADF) Flashcards
1
Q
- The phenomenon of coastal refraction which affects the accuracy of ADF bearings:
A
can be minimised by taking bearings where the signal crosses the coastline at right angles
2
Q
- 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:
A
starboard of track and nearer ‘B’
3
Q
- ADF Quadrantal Error is caused by:
A
the aircraft’s major electrical axis, the fuselage, reflecting and re-radiating the incoming
NDB transmissions
4
Q
- The overall accuracy of ADF bearings by day within the Promulgated Range (DOC) is:
A
±5°
5
Q
- In order to Tune, Identify and Monitor N0N A1A NDB emissions the BFO should be used as follows:
A
Tune ON
Identify ON
Monitor ON
6
Q
- The magnitude of the error in position lines derived from ADF bearings that are affected by coastal refraction may be reduced by:
A
choosing beacons on or near the coast
7
Q
- The BFO facility on ADF equipment should be used as follows when an NDB having N0N A1A type emission is to be used:
A
BFO should be switched on for tuning, ident and monitoring
8
Q
- 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:
A
long range skywave interference from other transmitters
9
Q
- 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:
A
day ± 5°
10
Q
- 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……………
A
at the aircraft, cardioid, bearing
11
Q
- 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:
A
accelerating / away from
12
Q
- In an ADF system, night effect is most pronounced:
A
at dusk and dawn
13
Q
- When the induced signals from the loop and the sense antenna are combined in an ADF receiver, the resultant polar diagram is:
A
a cardioid
14
Q
- 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:
A
closer to the coast
15
Q
- 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
a maximum value