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CPL Test Series
Question Bank
Questions for R* B*L* ADF/NDB
Answer the following questions
Test Mode
Training Mode
1. Direction property error is known as?
quadrantal error
90° ambiguity
180° ambiguity
2. The D layer of the ionosphere affects the accuracy of NDB bearings
by night only
never
by day and night
3. Consider the following statements on the NDB transmitter
It is very simple, being required to transmit only a carrier wave and identification
It is operating in the HF/VHF band
In India, most NDBs operate in the frequency band 455-1750 kHz
4. What is the approved frequency band assigned to aeronautical ADFs?
190-1750 GHz
190-1750 Hz
190-1750 kHz
5. An ADF uses a sense aerial to
determine the null position
resolve ambiguous bearings
transmit the beacon ident
6. What is used to resolve 180° ambiguity?
Loop Aerial
Align radio compass to True North
Sense Aerial
7. What is the wavelength of an NDB transmitting on 373 kHz?
8000m
80m
800m
8. With regard to the following types of NDB which statements is correct?
Locators have 5000 W power, 50 nm range and are NON A1A
Locators have 200 W power, 50 nm range and are NON A2A
Locators have 15 W power, 10-25 nm range and are NON A2A
9. An aircraft is "homing" to a radio beacon whilst maintaining a relative bearing of zero. If the magnetic heading decreases, the aircraft is experiencing
left drift
zero drift
rigth drift
10. Factors liable to affect most NDB/ADF system performance and reliability include
static interference-night effect-absence of failure warning system
height error-station intereference-mountain effect
station interference-station interference-latitude error
11. When using NDBs night effect is most likely to be greatest at
dawn
dusk
dawn or dusk
12. An aircraft is maintaining track outbound from an NDB with a constant relative bearing of 184°. To return to the NDB the relative bearing to maintain is
004°
184°
356°
13. Which of the following is likely to have the greatest effect on ADF accuracy?
Interference from other NDBs, particularly at night
Frequency drift at the ground station
Mutual interference between aircraft aerials
14. "Night effect" which causes loss of signal and fading, resulting in bearing errors from transmissions, is due to
interference from other transmissions and is maximum at dusk when east of the NDB
static activity increasing at night particularly in the lower frequency band
skywave distortion of the null position and is maximum at dawn and dusk
15. When using a NON A2A NDB the BFO should be
on for tuning and off for identification
off for tuning and on for identification
off for tuning and off for identification
16. Long range NDBs normally employ
A9E
A3W
NON/A1A
17. The BFO
is used to make the ident from an A1A NDB audible
creates the audio ident from an NDB
is sued to determine the signal strength of an NDB
18. Which of the following equipments does not have a system to warn the pilot that it is inoperative
ILS
ADF
VOR
19. Errors caused by the effect of coastal refraction on bearings at lower altitudes are maximum when the NDB is
inland and the bearing crosses the coast at right angles
near the coast and the bearing crosses the coast at right angles
inland and the bearing crosses the coast at an acute angle
20. An NDB signal crossing from land to sea will ____ speed and bend ___ the normal
decrease, away from
increase, towards
increase, away from
21. Quadrantal errors associated with aircraft Automatic Direction Finding (ADF) equipment are caused by
skywave/ground wave contamination
signal bending caused by electrical interference from aircraft wiring
signal bending by the aircraft metallic surfaces
22. There are two NDBs, one 20NM inland, and the other 50NM inland from the coast. Assuming that the error caused by coastal refraction is the same for both propogations, the extent of the rror in a position line plotted by an aircraft that is over water will be
greater from the beacon that is 50NM inland
greater from the beacon that is 20NM inland
the same from both beacons when the aircraft is on relative bearing of 180° and 360°
23. The BFO selector on an ADF receiver is used to
find the loop "null" position
hear the IDENT of some NDB stations radiating a continuous wave signal
stop loop rotation
24. Which one of the following disturbances is most likely to cause the greatest inaccuracy in ADF bearings?
Local thunderstorm activity
Quadrantal error
Coastal effect
25. A radio beacon has an operational range of 10 NM. By what factor should the transmitter power be increased in order to achieve an operational range of 20 NM?
Two
Eight
Four
26. An aero plane is flying parallel to a coast. Which of the following NDBs will give the greatest coastal refraction LOP error?
NDB sited 30 nm inland- RBI 330°
NDB sited on the coast - RBI 300°
NDB sited on the coast - RBI 330°
27. An A/C is flying on HDG of 315°, which of the following signal will cause maximum quadrantal error
225°
135°
360°
28. Variations of signal in NDB receivers due skywaves indicates the presence of
coastal refraction
mountain or terrain effect
night effect
29. The promulgated range for an NDB is applicable
throughout 24 hours, but is most prone to error around dusk and dawn
during daytime only
during night time only
30. The purpose of the BFO switch on the ADF receiver is to
make the signal audible
cut out the static noise
improve the strength of the received signal
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