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CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. 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?
296 NM.
165 NM.
330 NM.
186 NM.
2. DME is a .. Radar which, provides .. Distances between the aircraft and a ground ..?
Primary, accurate, transmitter.
Secondary, earth, transponder.
Primary, slant, transponder.
Secondary, slant, transponder.
3. The design requirements for DME stipulate that, at a range of 100 nm the maximum systemic error should not exceed?
Not more than +/- 1.5 nm.
Not more than +/- 1.25 nm.
Not more than +/- 3 nm.
Not more than +/- 0.25 nm.
4. 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 starts directly after the correct DME frequency has been selected on the frequency-selected panel by the pilot.
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.
5. 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?
296 nm.
330 nm.
158 nm.
186 nm.
6. Which of the following provides distance information?
DME
ADF
VOR
VDF
7. 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 airborne installation switching to the memory mode for about 10 to 15 seconds.
The ground installation not sending any pulse-pairs.
The airborne installation switching directly to the search mode.
The signal controlled search circuit (SCS) blanking the DME display.
8. 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.
9. The airborne DME equipment will transmit pulse pairs at a comparatively high PRF?
Whenever a stable signal is being received from the selected ground station.
Which first switched on and after channel change.
When the distance presented is above 50 nm.
At all times, except when the panel control "LO" is operated.
10. An aircraft flying at FL360 is 10 nm plan range from a DM. The DME reading in the aircraft will be?
10 nm.
13.6 nm.
8 nm.
11.7 nm.
11. An aircraft flying at FL430 obtains a DME range of 25 nm. The true range from the DME is between?
23.25 and 24.75 nm.
22.5 and 23.5 nm.
24.5 and 25.5 nm.
25.2 and 26.8 nm.
12. The aircraft DME receiver is able to accept replies to its own transmissions and reject replies to other aircraft interrogators because?
Aircraft interrogation signals and transponder response signals are 63 MHz removed from each other.
The time interval between pulse pairs is unique to that aircraft.
Pulse pairs are amplitude modulated with the aircraft registration.
Transmission frequencies are 63 MHz different for each aircraft.
13. DME is a radar type of facility and its maximum range is limited by?
The pulse repetition interval.
The height of the aeroplane.
The transmitter power only.
The receiver sensitivity.
14. 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 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.
It alternates between search and memory modes every 10 seconds.
15. 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?
Range to DME stations is always less than 200 nm.
Aeroplane is below the line-of-sight altitude.
Aeroplane is circling around the station.
Altitude is too high.
16. Which one the statements below is correct regarding the DME?
Two lines of position obtained from two different DME's give an unambiguous fix.
The DME operating frequencies are in the UHF frequency band.
The DME ground station is always co-located with a VOR station.
The indicated distance is the ground distance measured from the aircraft's projected position on the ground to the DME ground installation.
17. A typical frequency employed in Distance Measuring Equipment (DME) is
100 MHz.
1000 MHz.
100 GHz.
10 MHz.
18. 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 protect the transponder-receiver against reflected 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 detect if the interrogator-receiver has been locked on, by reflected pulse-pairs.
19. Distance Measuring Equipment (DME) uses radar principles to measure distance?
Vertically.
Plan range.
Slant range.
Horizontally.
20. What is the maximum distance between VOR and DME/TACAN ground installations if they are to have the same morse code identifier?
300 m.
600 m.
2000 m.
60 m.
21. On a DME, display counters rotating throughout their range indicates
The airborne equipment is conducting a frequency search.
The airborne receiver is conducting a range search.
Ground equipment failure.
Airborne equipment failure.
22. DME pulses are transmitted as pulse pairs. This is done?
So that pulses are square and easily identified.
So that any radar emissions do not interfere with the DME equipment.
To increases the range.
To prevent lock onto the ground.
23. The time interval between a transmitted DME pulse and the reply pulse is 120 microsecond. The slant range is?
9.7 km.
9.7 nm.
5.7 km.
5.7 nm.
24. The DME ground transponder has a PRF of?
27 pulses per second.
1500 pulses per second.
2700 pulses per second.
150 pulses per second.
25. A DME is located at MSL. An aircraft passing vertically above the station at flight level 360 will obtain a DME range of approximately?
8 nm.
7 nm.
6 nm.
11 nm.
26. 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?
162 nm.
300 nm.
300 km.
81 nm.
27. 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 - 1.5 NM.
+ or - 1.25 NM.
+ or - 3 NM.
28. The design requirements for DME stipulate that, at a range of 100 NM, the maximum systematic error should not exceed
+ or - 1.5 NM.
+ or - 3.5 NM.
+ or - 1.25 NM.
+ or - 2.25 NM.
29. 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?
13.3 nm.
17.6 nm.
15 nm.
16.5 nm.
30. 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.
31. An aircraft DME receiver does not lock on to its own transmissions reflected from the ground because
The pulse recurrence rate are varied.
DME transmits twin pulses.
DME uses the UHF band.
They are not on the receiver frequency.
32. When VOR and DME station are associated?
Their aerials will be mounted on top of each other.
They may be separated by as much as 600 metres if they are meant for enroute navigation.
Their signals must be tuned in by VOR and DME sets in the aircraft having common frequency control.
Their IDS will be in all respects identical.
33. An aircraft passes overhead a DME station at 12000 ft above the station. At that time the DME reading will be?
FLAG/OFF, the aircraft is within the cone of silence.
Fluctuating and not significant.
0 nm.
Approximately 2 nm.
34. Given: Aircraft height = 32000 feet, DME indicated range = 16 nm. The actual true range is?
15.1 nm.
16.6 nm.
6.6 nm.
22.8 nm.
35. Which one is the most correct statement regarding the range of the DME system?
Has unlimited range due to ground wave propagation.
Operates on the principle of phase comparison.
Range within "line of sight" and maximum 200 nm.
Operates on VHF.
36. A VOR and DME are frequency paired. The DME identification ends with Z. This denotes that?
The two beacons are greater than 2000 metres apart.
The two beacons are supporting the same site, but are not co-located.
The beacons are at the same location but more than 1000 metres apart.
The two beacons are co-located.
37. A fix obtained by rho-rho navigation is based on information from two?
NDBs.
VORs.
VDFs.
DMEs.
38. 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.
17 NM.
21.35 NM.
20.61 NM.
39. 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 without a reduction in PRF.
Stays in search mode but reduces PRF to max. 60 PPS after 100 seconds.
40. The DME counters are rotating continuously. This indicates?
The DME is trying to lock onto a frequency.
The DME is trying to lock onto a range.
The DME is unserviceable.
The DME is receiving no response from the ground station.
41. Regarding the DME system, which one of the following statement is true?
The DME measures the phase difference between the reference and the variable signals to calculate the distance.
When passing overhead the DME station the DME will indicate 0.
DME operates in the VHF frequency band.
The transponder reply carrier frequency differs by 63 MHz from that of the interrogation signal.
42. What is the approved frequency band assigned to DME?
962 to 1213 kHz.
329 to 335 MHz.
108 to 118 MHz.
962 to 1213 MHz.
43. 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?
167 degrees.
Aircraft will not receive DME information from PTC due to the line of sight.
332 degrees.
193 degrees.
44. DME channels utilise frequencies of approximately
600 MHz.
1000 MHz.
110 MHz.
300 MHz.
45. 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 and 2.
1,2,3 and 4.
3 and 4.
46. 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 tracking directly away from the station at range of 10 NM.
When passing abeam the station and within 5 NM of it.
When overhead the station, with no change of heading at transit.
47. Groundspeed measurement using DME equipment is most accurate when flying?
Towards the station at short range.
Past the station at short range.
From the station at long range.
Directly over the station.
48. 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 5 nm.
less than 300 kts and 7 nm.
300 kts and 7 nm.
300 kts and 5 nm.
49. Ground DME responders respond at a frequency?
63 MHz higher than the interrogation signal.
63 MHz different from the interrogation signal, above or below.
63 MHz lower than the interrogation signal.
The same as the interrogation signal.
50. 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 down from the maximum and the power decreases.
The PRF increases and the range counters count up to the maximum.
The PRF decreases and the range counters count down from the maximum and the power increases.
The PRF increases and the power is increased.
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