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