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CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. 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?
1.42 nm.
0.31 nm.
0.57 nm.
0.09 nm.
2. What are the DME frequencies?
960 to 1090 MHz.
960 to 1215 MHz.
1030 to 1215 MHz.
690 to 1215 MHz.
3. 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?
2000 m.
300 m.
100 m.
600 m.
4. 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.
5. A DME that has difficulty obtaining a "lock-on"? (NOTE: PRF= pulse recurrence frequency, PPS= pulses per second)
Alternates search mode with periods of memory mode lasting 10 seconds.
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.
6. 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?
194 degrees.
166 degrees.
166 degrees
346 degrees.
7. In the which situation will speed indications on an airborne Distance Measuring Equipment (DME) most closely represent the groundspeed of an aircraft flying at FL400?
When tracking directly towards the station at a range of 100 NM or more.
When passing abeam the station and within 5 NM of it.
When overhead the station, with no change of heading at transit.
When tracking directly away from the station at range of 10 NM.
8. Consider the following statement on horizontal/slant distance when using DME?
The difference between the two is automatically compensated for in all DME equipment.
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.
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 horizontal distance is always slightly longer than the slant distance.
9. If a DME beacon becomes saturated by interrogations it?
Replies to the nearest 100 aircraft.
Adjusts its PRF to cope with all aircraft.
Adjusts the gain to reply to the 100 strongest signals.
Switches off its identification.
10. 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 circling around the station.
Altitude is too high.
Range to DME stations is always less than 200 nm.
Aeroplane is below the line-of-sight altitude.
11. Which statement about the interrogation by DME interrogator is correct?
The interrogation can only take place if the Echo protection circuit has been locked.
The interrogation starts when the interrogator has been warmed up sufficiently, whether pulse-pairs are received or not.
The interrogation starts directly after the correct DME frequency has been selected on the frequency-selected panel by the pilot.
The interrogation does not start before pulse-pairs of the tuned DME station are received.
12. 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?
12 NM.
10.44 NM.
13.44 NM.
11.35 NM.
13. Which of the following provides distance information?
ADF
DME
VDF
VOR
14. What happens when a DME in the search mode fails to achieve lock-on?
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 15000 pulse pairs.
It stays in the search mode at 150 PPPs.
It stays in the search mode, but reduces to 60 pulse-pairs per second (PPPS) after 100 seconds.
15. On a DME, display counters rotating throughout their range indicates
The airborne equipment is conducting a frequency search.
Airborne equipment failure.
Ground equipment failure.
The airborne receiver is conducting a range search.
16. 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.
300 nm.
162 nm.
17. The effect of masking the DME antenna of the aircraft from the ground installation is that interruption of reception of DME signals results in?
The ground installation not sending any pulse-pairs.
The signal controlled search circuit (SCS) blanking the DME display.
The airborne installation switching to the memory mode for about 10 to 15 seconds.
The airborne installation switching directly to the search mode.
18. 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?
The aircraft is too high to receive the signal.
The aircraft is too low to receive the signal.
DME is limited to 200 nm.
The beacon is saturated.
19. 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?
21.35 NM.
15 NM.
17 NM,
20.88 NM.
20. DME pulses are transmitted as pulse pairs. This is done?
To increases the range.
So that pulses are square and easily identified.
So that any radar emissions do not interfere with the DME equipment.
To prevent lock onto the ground.
21. 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 higher pitch that was broadcast only once.
The VOR IDENT is transmitted three times followed by the DME IDENT transmitted once.
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.
22. An enroute DME and VOR that have the same morse code identification are associated and are?
Within 2000 feet of each other.
Within 100 feet of each other.
Within 600 feet of each other.
Always co-located.
23. When an aircraft at FL360 it is directly above a DME, at mean sea level, the range display will be?
9 nm.
0 nm.
12 nm.
6 nm.
24. What is the approved frequency band assigned to DME?
329 to 335 MHz.
108 to 118 MHz.
962 to 1213 MHz.
962 to 1213 kHz.
25. A typical frequency employed in Distance Measuring Equipment (DME) is
100 GHz.
1000 MHz.
10 MHz.
100 MHz.
26. An aircraft DME receiver does not lock on to its own transmissions reflected from the ground because
They are not on the receiver frequency.
The pulse recurrence rate are varied.
DME transmits twin pulses.
DME uses the UHF band.
27. The most accurate measurement if ground speed by DME for an aircraft at 30000 feet will be when the aircraft is?
Overhead the beacon.
Tracking towards the beacon at 10 nm.
Tracking away from the beacon at 100 nm.
Passing abeam the beacon at 50 nm.
28. Regarding the DME system, which one of the following statement is true?
The transponder reply carrier frequency differs by 63 MHz from that of the interrogation signal.
The DME measures the phase difference between the reference and the variable signals to calculate the distance.
DME operates in the VHF frequency band.
When passing overhead the DME station the DME will indicate 0.
29. 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 DME transponder uses a slightly different, randomly varying, delay for each interrogating aircraft.
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 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.
30. The ident of a DME in case of collocation with a VOR is as follows?
In 40 seconds the DME ident will sound once.
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 30 seconds the DME ident comes up 3 times at an audio frequency of 1350 Hz.
31. By using a random PRG the airborne DME can?
Reduce the effect of weather interference.
Prevent interference from random transmissions.
Recognise a beacon's reply among a mass of ground returns.
Distinguish between its own replies and those replies triggered by other aircraft.
32. 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 7 nm.
300 kts and 5 nm.
less than 300 kts and 5 nm.
less than 300 kts and 7 nm.
33. 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 prevent that DMR interrogation pulse pairs from being received by the aircraft after reflection on the earth's surface.
The more DME frequencies are available from different beacons.
To avoid second trace returns when a DME is more than 200 nm away.
34. 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?
158 nm.
330 nm.
186 nm.
296 nm.
35. The DME ground transponder has a PRF of?
2700 pulses per second.
1500 pulses per second.
27 pulses per second.
150 pulses per second.
36. The DME line of Position is a circle with radius?
The slant range and centre the aircraft.
A ground distance and centre the DME station.
The slant range and centre the DME station.
The ground distance and centre the aircraft.
37. 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 search mode.
The DME is in the tracking mode due to a turn.
The DME is in memory mode.
38. DME is a secondary radar operating in the (i) .. band using frequencies between (ii) ......?
(i) SHF, (ii) 960 to 1215 GHz.
(i) UHF, (ii) 960 to 1215 GHz.
(i) SHF, (ii) 960 to 1215 MHz.
(i) UHF, (ii) 920 to 1215 MHz.
39. When VOR and DME station are associated?
Their aerials will be mounted on top of each other.
Their signals must be tuned in by VOR and DME sets in the aircraft having common frequency control.
They may be separated by as much as 600 metres if they are meant for enroute navigation.
Their IDS will be in all respects identical.
40. DME uses (i) .... radar principles in the (ii) ..... band ?
(i) primary, (ii) SHF,
(i) primary, (ii) UHF.
(i) secondary, (ii) UHF.
(i) secondary, (ii) SHF.
41. A DME is located at MSL. An aircraft passing vertically above the station at flight level 360 will obtain a DME range of approximately?
6 nm.
11 nm.
7 nm.
8 nm.
42. What is the maximum distance between VOR and DME/TACAN ground installations if they are to have the same morse code identifier?
600 m.
2000 m.
60 m.
300 m.
43. A VOR and DME are frequency paired. The DME identification ends with Z. This denotes that?
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.
The two beacons are supporting the same site, but are not co-located.
44. 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?
15 NM.
21.35 NM.
20.61 NM.
17 NM.
45. In which of the following bands does DME operate?
UHF.
SHF
EHF.
VHF.
46. Distance Measuring Equipment (DME) uses radar principles to measure distance?
Slant range.
Vertically.
Plan range.
Horizontally.
47. 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?
17 nm.
16 nm.
14 nm.
15 nm.
48. DME is a .. Radar which, provides .. Distances between the aircraft and a ground ..?
Primary, slant, transponder.
Secondary, slant, transponder.
Secondary, earth, transponder.
Primary, accurate, transmitter.
49. 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?
4.9 nm.
4.6 nm.
4.3 nm.
5.2 nm.
50. 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.
Aircraft will not receive DME information from PTC due to the line of sight.
193 degrees.
167 degrees.
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