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CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. A DME transmitter is operating in the search-for-lock phase. Which of the following is true?
The PRF decreases and the range counters count down from the maximum and the power increases.
The PRF increases and the power is increased.
The PRF increases and the range counters count up to the maximum.
The PRF increases and the range counters count down from the maximum and the power decreases.
2. The aircraft DME receiver is able to accept replies to its own transmissions and reject replies to other aircraft interrogations because
Pulse pairs are discreet to a particular aircraft.
Pulse pairs are amplitude modulated with the aircraft registration.
Aircraft interrogation signals and transponder responses are 63 MHz removed from each other.
Transmission frequencies are 63 MHz different for each aircraft.
3. The maximum number of aeroplanes that can be responded to by the DME ground facility is?
10.
100.
150.
unlimited
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.
162 nm.
81 nm.
300 nm.
5. A DME station is located 7000 feet above MSL. An aircraft flying at FL 430 , 20 NM away from the DME station, will have DME reading?
15 NM.
21.35 NM.
17 NM,
20.88 NM.
6. Groundspeed measurement using DME equipment is most accurate when flying?
Past the station at short range.
From the station at long range.
Towards the station at short range.
Directly over the station.
7. By using a random PRG the airborne DME can?
Recognise a beacon's reply among a mass of ground returns.
Prevent interference from random transmissions.
Reduce the effect of weather interference.
Distinguish between its own replies and those replies triggered by other aircraft.
8. What is the approved frequency band assigned to DME?
962 to 1213 kHz.
108 to 118 MHz.
329 to 335 MHz.
962 to 1213 MHz.
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?
16 nm.
14 nm.
15 nm.
17 nm.
10. In a certain VORTAC installation the VOR station is identified as "STN" and the DME station is identified as "STZ". This means that the distance between the two beacons is in excess of?
600 m.
2000 m.
100 m.
300 m.
11. The reason for using different frequencies for the airborne and ground equipment of DME is?
That side lobes can be suppressed by the side lobe suppressor (SLS).
To avoid second trace returns when a DME is more than 200 nm away.
The more DME frequencies are available from different beacons.
To prevent that DMR interrogation pulse pairs from being received by the aircraft after reflection on the earth's surface.
12. 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.
13. 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?
243 NM.
186 NM.
296 NM.
330 NM.
14. The DME counters are rotating continuously. This indicates?
The DME is unserviceable.
The DME is trying to lock onto a frequency.
The DME is trying to lock onto a range.
The DME is receiving no response from the ground station.
15. A DME that has difficulty obtaining a "lock-on"? (NOTE: PRF= pulse recurrence frequency, PPS= pulses per second)
Stays in search mode but reduces PRF to max. 60 PPS after 15000 pulse pairs have been transmitted.
Stays in search mode but reduces PRF to max. 60 PPS after 100 seconds.
Stays in search mode without a reduction in PRF.
Alternates search mode with periods of memory mode lasting 10 seconds.
16. With respect to the principle of distance measurement equipment DME it can be stated that: 1.The interrogation signal is transmitted on the same frequency as the reply signal. 2.The DME station always has a transponder delay of 50 milliseconds. 3.The time between the pulse pairs of the interrogation signal is at random. 4.In the search mode more pulse pairs per second are transmitted than in the tracking mode. Which of the above given statement are correct?
2,3 and 4.
1,2,3 and 4.
1 and 2.
3 and 4.
17. An aircraft flying at FL360 is 10 nm plan range from a DM. The DME reading in the aircraft will be?
11.7 nm.
10 nm.
13.6 nm.
8 nm.
18. A VOR and DME are frequency paired. The DME identification ends with Z. This denotes that?
The beacons are at the same location but more than 1000 metres apart.
The two beacons are greater than 2000 metres apart.
The two beacons are supporting the same site, but are not co-located.
The two beacons are co-located.
19. DME is a .. Radar which, provides .. Distances between the aircraft and a ground ..?
Secondary, slant, transponder.
Primary, slant, transponder.
Primary, accurate, transmitter.
Secondary, earth, transponder.
20. Aircraft position 52 degrees 09 minutes S 024 degrees E, magnetic variation 14 degrees W, FL310. BIT VOR/DME position 54 degrees 42'S 024 degrees E, magnetic variation 14 degrees E. In order to read the most accurate ground speed given by the DME receiver from his present position, the pilot must fly on which BIT radial?
166 degrees
166 degrees.
346 degrees.
194 degrees.
21. During a flight at FL 210, a pilot does not receive any DME distance indication from a DME station located approximately 220 NM away. The reason for this is that the?
Altitude is too high
Range of a DME system is always less than 200 NM
Aeroplane is circling around the station
Aeroplane is below the 'line of sight' altitude
22. An aircraft flying at FL180 is 190 nm from a DME (located at 0 feet AMSL). The aircraft equipment fails to lock on, this is because?
DME is limited to 200 nm.
The beacon is saturated.
The aircraft is too low to receive the signal.
The aircraft is too high to receive the signal.
23. The selection of the DME frequency for a ILS/DME installation is as follows?
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.
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.
24. A VOR and DME are co-located. You want to identify the DME by listening to the callsign. Having heard the same callsign 4 times in 30 seconds the?
DME callsign was not transmitted, the distance information is sufficient proof of correct operation.
DME callsign is the one with the lower pitch that was broadcast several times VOR and DME callsigns were the same and broadcast with the same pitch.
The VOR IDENT is transmitted three times followed by the DME IDENT transmitted once.
DME callsign is the one with the higher pitch that was broadcast only once.
25. Ground DME responders respond at a frequency?
63 MHz different from the interrogation signal, above or below.
The same as the interrogation signal.
63 MHz lower than the interrogation signal.
63 MHz higher than the interrogation signal.
26. For a conventional DME facility 'Beacon saturation' will occur whenever the number of simultaneous interrogation exceeds
200
80
100.
60.
27. The aircraft DME receiver is able to accept replies to its own transmissions and reject replies to other aircraft interrogators because?
The time interval between pulse pairs is unique to that aircraft.
Aircraft interrogation signals and transponder response signals are 63 MHz removed from each other.
Pulse pairs are amplitude modulated with the aircraft registration.
Transmission frequencies are 63 MHz different for each aircraft.
28. 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 tracking directly towards the station at a range of 10 nm or less.
When tracking directly towards the station at a range of 100 nm or more
When overhead the station, with no change of heading at transit.
When passing abeam the station within 5 nm of it.
29. An aircraft is flying directly overhead a DME station at FL380. The indicated range will be approximately?
6.3 nm.
5.1 nm.
5.1 km.
6.3 km.
30. Given: Aircraft height = 32000 feet, DME indicated range = 16 nm. The actual true range is?
6.6 nm.
16.6 nm.
15.1 nm.
22.8 nm.
31. 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 microseconds. The slant range from the ground transponder is?
330 nm.
158 nm.
296 nm.
186 nm.
32. The ident of a DME in case of collocation with a VOR is as follows?
The DME ident comes every 10 seconds at an audio frequency of 1020 Hz.
In case of collocation the DME ident is not necessary if the VOR ident is present.
In 40 seconds the DME ident will sound once.
In 30 seconds the DME ident comes up 3 times at an audio frequency of 1350 Hz.
33. The aircraft DME receiver cannot lock on to interrogation signal reflected from the ground because
Aircraft transmitter and DME ground station are transmitting on different frequencies.
Reflections are subject to doppler frequency shift.
DME pulse recurrence rate are varied.
DME transmits twin pulses.
34. What are the DME frequencies?
960 to 1090 MHz.
960 to 1215 MHz.
690 to 1215 MHz.
1030 to 1215 MHz.
35. 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?
less than 300 kts and 7 nm.
less than 300 kts and 5 nm.
300 kts and 5 nm.
300 kts and 7 nm.
36. The design requirements for DME stipulate that, at a range of 100 nm the maximum systemic error should not exceed?
Not more than +/- 1.25 nm.
Not more than +/- 0.25 nm.
Not more than +/- 3 nm.
Not more than +/- 1.5 nm.
37. Which statement about the interrogation by DME interrogator is correct?
The interrogation does not start before pulse-pairs of the tuned DME station are received.
The interrogation can only take place if the Echo protection circuit has been locked.
The interrogation starts directly after the correct DME frequency has been selected on the frequency-selected panel by the pilot.
The interrogation starts when the interrogator has been warmed up sufficiently, whether pulse-pairs are received or not.
38. 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.
39. A DME station is located 1000 feet above MSL. An aircraft flying at FL 310,20 NM away from the DME station, will have a DME reading of?
21.35 NM.
20.61 NM.
17 NM.
15 NM.
40. Which of the following provides distance information?
ADF
VOR
DME
VDF
41. The indicated range from a DME station is?
0 when passing overhead the station.
Slant range.
Ground range.
Ground range only if the beacon is co-located with a VOR.
42. 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.
4.9 nm.
4.6 nm.
5.2 nm.
43. If a DME beacon becomes saturated by interrogations it?
Adjusts the gain to reply to the 100 strongest signals.
Adjusts its PRF to cope with all aircraft.
Switches off its identification.
Replies to the nearest 100 aircraft.
44. The airborne DME equipment will transmit pulse pairs at a comparatively high PRF?
When the distance presented is above 50 nm.
At all times, except when the panel control "LO" is operated.
Whenever a stable signal is being received from the selected ground station.
Which first switched on and after channel change.
45. Aircraft position 34 degrees 15 minutes N 098 degrees E, magnetic variation 28 degrees W, FL280. PTV, VOR/DME position 36 degrees 12' N 098 degrees E, magnetic variation13 degrees E, In order to read the most accurate ground speed given by the DME receiver from his present position, the pilot must fly on which PTC radial?
332 degrees.
193 degrees.
Aircraft will not receive DME information from PTC due to the line of sight.
167 degrees.
46. When in tracking mode, the DME airborne interrogator operates at? Note: PRR = Pulse Recurrence Rate
A PRR fixed at a rate selected from the range 5 to 25 PPS.
A PRR variable between 5 and 25 PPS.
A PRR of 150 PPS.
A PRR of 2700 PPS (Pulse Per Second).
47. A typical frequency employed in Distance Measuring Equipment (DME) is
100 MHz.
1000 MHz.
10 MHz.
100 GHz.
48. 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.
186 NM.
330 NM.
296 NM.
49. DME is a radar type of facility and its maximum range is limited by?
The transmitter power only.
The height of the aeroplane.
The receiver sensitivity.
The pulse repetition interval.
50. How many aircraft will DME accommodate before reaching saturation?
50
100.
150
120
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