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CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. The design requirements for DME stipulate that, at a range of 100 NM, the maximum systematic error should not exceed
+ or - 0.25 NM.
+ or - 1.25 NM.
+ or - 1.5 NM.
+ or - 3 NM.
2. For a conventional DME facility 'Beacon saturation' will occur whenever the number of simultaneous interrogation exceeds
100.
80
60.
200
3. Distance Measuring Equipment (DME) uses radar principles to measure distance?
Plan range.
Slant range.
Vertically.
Horizontally.
4. The time from the transmission of a DME interrogation pulse to the receipt of the reply from the DME ground station is 1000 microseconds (ignore the delay in the DME ground station). The slant range is?
300 km.
81 nm.
162 nm.
300 nm.
5. The selection of the DME frequency for a ILS/DME installation is as follows?
The pilot has to insert the channel number and also the X or Y.
The DME frequency is paired with the localiser frequency so only the localiser frequency is set.
The DME frequency has to be selected by the pilot.
When an ILS/DME is flown then the selection of the DME has always to be done manually.
6. The time taken for the transmission of an interrogation pulse by a Distance Measuring Equipment (DME) to travel to the ground transponder and return to the airborne receiver was 4000 microsecond. The slant range from the ground transponder was?
324 NM.
296 NM.
330 NM.
186 NM.
7. Which one the statements below is correct regarding the DME?
The indicated distance is the ground distance measured from the aircraft's projected position on the ground to the DME ground installation.
The DME ground station is always co-located with a VOR station.
Two lines of position obtained from two different DME's give an unambiguous fix.
The DME operating frequencies are in the UHF frequency band.
8. A DME transmitter is operating in the search-for-lock phase. Which of the following is true?
The PRF increases and the range counters count up to the maximum.
The PRF increases and the power is increased.
The PRF decreases and the range counters count down from the maximum and the power increases.
The PRF increases and the range counters count down from the maximum and the power decreases.
9. A DME station is located 1000 ft above MSL. An aircraft which is flying at FL 370 in ISA conditions, is 15 nm away from the DME station, will have a DME reading of?
15 nm.
14 nm.
17 nm.
16 nm.
10. DME pulses are transmitted as pulse pairs. This is done?
To increases the range.
So that pulses are square and easily identified.
To prevent lock onto the ground.
So that any radar emissions do not interfere with the DME equipment.
11. In which situation will speed indication will speed indications on an airborne Distance Measuring Equipment (DME) most closely represent the groundspeed of an aircraft flying at FL 440?
When overhead the station, with no change of heading at transit.
When tracking directly towards the station at a range of 100 nm or more
When passing abeam the station within 5 nm of it.
When tracking directly towards the station at a range of 10 nm or less.
12. A VOR and DME are frequency paired. The DME identification ends with Z. This denotes that?
The two beacons are supporting the same site, but are not co-located.
The two beacons are co-located.
The beacons are at the same location but more than 1000 metres apart.
The two beacons are greater than 2000 metres apart.
13. The DME (Distance Measuring Equipment) operates within the following frequencies
962 to 1213 MHz.
108 to 118 MHz.
962 to 1213 kHz.
329 to 335 MHz.
14. An aircraft passes overhead a DME station at 12000 ft above the station. At that time the DME reading will be?
Fluctuating and not significant.
0 nm.
Approximately 2 nm.
FLAG/OFF, the aircraft is within the cone of silence.
15. The aircraft DME receiver is able to accept replies to its own transmissions and reject replies to other aircraft interrogations because
Transmission frequencies are 63 MHz different for each aircraft.
Pulse pairs are amplitude modulated with the aircraft registration.
Aircraft interrogation signals and transponder responses are 63 MHz removed from each other.
Pulse pairs are discreet to a particular aircraft.
16. The DME in an aircraft flying at FL430 shows a range of 15 nm from a beacon at an elevation of 167 feet. The plan range is?
17.6 nm.
15 nm.
16.5 nm.
13.3 nm.
17. DME channels utilise frequencies of approximately
600 MHz.
1000 MHz.
110 MHz.
300 MHz.
18. An enroute DME and VOR that have the same morse code identification are associated and are?
Within 2000 feet of each other.
Within 600 feet of each other.
Within 100 feet of each other.
Always co-located.
19. A DME in tracking mode subsequently experiences a reduction in signal strength will switch the equipment in the first instance to
Memory mode.
Standby mode.
Search mode.
Signal controlled search.
20. A DME station is located 2000 feet above MSL. An aircraft flying at FL 200, 10 NM away from the DME station, will have a DME reading of?
10.44 NM.
12 NM.
13.44 NM.
11.35 NM.
21. An aircraft flying at FL360 is 10 nm plan range from a DM. The DME reading in the aircraft will be?
11.7 nm.
13.6 nm.
8 nm.
10 nm.
22. Where a DME uses mechanical counters for displaying the range, continuous rotation of the counters means?
None of the above.
The DME is in the tracking mode due to a turn.
The DME is in memory mode.
The DME is in the search mode.
23. Distance Mesuring Equipment (DME) operates in the?
VHF band and uses the principle of phase comparison.
SHF and uses the frequency modulation techniques.
UHF band and uses two frequencies.
UHF band and uses one frequency.
24. An aircraft at FL 300, with a groundspeed of 300 kts, is about to pass overhead a DME station at MSL, The dame receiver is capable of determining ground speed. One minute before the overhead, DME speed and distance indication respectively are?
300 kts and 5 nm.
less than 300 kts and 5 nm.
300 kts and 7 nm.
less than 300 kts and 7 nm.
25. An aircraft is flying directly overhead a DME station at FL380. The indicated range will be approximately?
6.3 nm.
5.1 km.
5.1 nm.
6.3 km.
26. When flying 6000 ft above a ground level, the DME indicates 5 nm, what is the horizontal distance from the aircraft to overhead the DME?
4.3 nm.
5.2 nm.
4.6 nm.
4.9 nm.
27. How can a DME interrogator distipulsenguish between its own reply pulse-pairs and the reply pulse-pairs of other aircraft in the area, using the same DME station?
The time-interval between both pulses of consecutive pulse-pairs transmitted by the interrogator varies, for each interrogator the is a unique rhythm.
The pulse repetition frequency of the pulse-pairs transmitted by the interrogator varies, for each interrogator there is a unique rhythm.
On the Y-channel the time interval between the pulses of an interrogator pulse-pair is 36 m/sec an of a transponder pulse-pair 30 m/sec.
The DME transponder uses a slightly different, randomly varying, delay for each interrogating aircraft.
28. Which one is the most correct statement regarding the range of the DME system?
Operates on the principle of phase comparison.
Has unlimited range due to ground wave propagation.
Operates on VHF.
Range within "line of sight" and maximum 200 nm.
29. Which of the following will give the most accurate calculation of aircraft ground speed?
A DME station sited across the flight route.
A DME station sited on the flight route.
A VOR station sited on the flight route.
An ADF sited on the flight route.
30. During a flight at FL260, a pilot does not receive any DME distance indication from a DME station located approximately 220 nm away. The reason for this is that?
Aeroplane is below the line-of-sight altitude.
Altitude is too high.
Range to DME stations is always less than 200 nm.
Aeroplane is circling around the station.
31. On a DME, display counters rotating throughout their range indicates
Ground equipment failure.
Airborne equipment failure.
The airborne receiver is conducting a range search.
The airborne equipment is conducting a frequency search.
32. What is the function of the Echo Protection Circuit (EPC)?
The EPC has to detect if pulse-pairs reflected by the ionosphere are interfering with directly received pulse-pairs.
The EPC has to detect if unwanted squitter-pulses are interfering with the well functioning of the interrogator-receiver.
The EPC has to protect the transponder-receiver against reflected pulse-pairs.
The EPC has to detect if the interrogator-receiver has been locked on, by reflected pulse-pairs.
33. A typical frequency employed in Distance Measuring Equipment (DME) is
100 MHz.
10 MHz.
100 GHz.
1000 MHz.
34. Consider the following statement on horizontal/slant distance when using DME?
The operator in the aircraft should always make a mental increase to the indicated range, in order to compensate for the difference between the horizontal distance and slant distance.
The difference between the two is automatically compensated for in all DME equipment.
The horizontal distance is always slightly longer than the slant distance.
The difference between the two distance will be negligible for enroute Navigation when the indicated distance in NM is more than the height of the aircraft in thousands of feet.
35. The time taken for the transmission of an interrogation pulse by a distance Measuring Equipment (DME) to travel to the ground transponder and return to the airborne receiver was 2000 microsecond. The slant range from the ground transponder was?
165 NM.
186 NM.
296 NM.
330 NM.
36. What is the approved frequency band assigned to DME?
962 to 1213 MHz.
962 to 1213 kHz.
108 to 118 MHz.
329 to 335 MHz.
37. Which of the following provides distance information?
ADF
VDF
DME
VOR
38. The time taken for the transmission of an interrogation pulse by a Distance Measuring Equipment (DME) to travel to the ground transponder and return to the airborne receiver was 3000 microsecond. The slant range from the ground transponder was?
296 NM.
243 NM.
330 NM.
186 NM.
39. A DME is located at MSL. An aircraft passing vertically above the station at flight level FL 360 will obtain a DMF range of approximately?
11 NM.
6 NM.
8 NM.
7 NM.
40. The time interval between a transmitted DME pulse and the reply pulse is 120 microsecond. The slant range is?
5.7 nm.
5.7 km.
9.7 km.
9.7 nm.
41. The maximum number of aeroplanes that can be responded to by the DME ground facility is?
100.
unlimited
10.
150.
42. How many aircraft will DME accommodate before reaching saturation?
100.
150
120
50
43. An aircraft at FL310 cannot receive a signal from a DME 240 nm away. Why?
The DME is saturated.
The aircraft is not in line-of-sight of the DME.
DME is never more than 200 nm.
The aircraft is too high.
44. What happens when a DME in the search mode fails to achieve lock-on?
It stays in the search mode, but reduces to 60 pulse-pairs per second (PPPS) after 15000 pulse pairs.
It alternates between search and memory modes every 10 seconds.
It stays in the search mode, but reduces to 60 pulse-pairs per second (PPPS) after 100 seconds.
It stays in the search mode at 150 PPPs.
45. An aircraft at FL410 is passing overhead a DME station at mean sea level. The DME indication will be approximately?
6.8 nm.
6.1 nm.
6.8 km.
6.1 km.
46. What are the DME frequencies?
960 to 1090 MHz.
960 to 1215 MHz.
690 to 1215 MHz.
1030 to 1215 MHz.
47. The DME ground transponder has a PRF of?
1500 pulses per second.
150 pulses per second.
27 pulses per second.
2700 pulses per second.
48. What is the slant range error for an aircraft at 9000 feet absolute above a DME located at elevation 2000 feet, when the slant range is 12 nm?
0.57 nm.
1.42 nm.
0.09 nm.
0.31 nm.
49. DME is a radar type of facility and its maximum range is limited by?
The height of the aeroplane.
The transmitter power only.
The pulse repetition interval.
The receiver sensitivity.
50. The DME line of Position is a circle with radius?
The slant range and centre the DME station.
The slant range and centre the aircraft.
The ground distance and centre the aircraft.
A ground distance and centre the DME station.
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