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CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. Distance Measuring Equipment (DME) operates in the
UHF band and is a secondary radar system.
SHF band uses frequency modulation techniques.
UHF band and is a primary radar system.
VHF band and uses the principle of phase comparison.
2. DME is a radar type of facility and its maximum range is limited by?
The pulse repetition interval.
The receiver sensitivity.
The height of the aeroplane.
The transmitter power only.
3. In which of the following bands does DME operate?
SHF
VHF.
EHF.
UHF.
4. When VOR and DME station are associated?
Their signals must be tuned in by VOR and DME sets in the aircraft having common frequency control.
Their aerials will be mounted on top of each other.
Their IDS will be in all respects identical.
They may be separated by as much as 600 metres if they are meant for enroute navigation.
5. The reason for using different frequencies for transmitting and receiving in the DME system is to?
Permit more channels in the system.
Avoid the reception in the aircraft of signals referring to other aircraft.
Prevent overload of the system.
Prevent self-triggering of the receiving equipment by the transmitter.
6. On a DME, display counters rotating throughout their range indicates
The airborne receiver is conducting a range search.
Airborne equipment failure.
Ground equipment failure.
The airborne equipment is conducting a frequency search.
7. 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 ground station is always co-located with a VOR station.
The DME operating frequencies are in the UHF frequency band.
The indicated distance is the ground distance measured from the aircraft's projected position on the ground to the DME ground installation.
8. Which of the following provides distance information?
VDF
VOR
DME
ADF
9. Of what use, if any, is a military TACAN station to civil aviation?
It is of no use to civil aviation.
It can provide DME distance.
It can provide a DME distance and magnetic bearing.
It can provide a magnetic bearing.
10. 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.
11. 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.
The beacon is saturated.
DME is limited to 200 nm.
12. 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.
6.1 km.
6.8 km.
13. 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 away from the station at range of 10 NM.
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.
14. 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.
186 nm.
158 nm.
15. A typical frequency employed in Distance Measuring Equipment (DME) is
100 MHz.
10 MHz.
100 GHz.
1000 MHz.
16. An enroute DME and VOR that have the same morse code identification are associated and are?
Within 600 feet of each other.
Within 100 feet of each other.
Within 2000 feet of each other.
Always co-located.
17. When an aircraft at FL360 it is directly above a DME, at mean sea level, the range display will be?
12 nm.
0 nm.
9 nm.
6 nm.
18. Ground DME responders respond at a frequency?
63 MHz lower than the interrogation signal.
63 MHz higher than the interrogation signal.
63 MHz different from the interrogation signal, above or below.
The same as the interrogation signal.
19. 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 passing abeam the station within 5 nm of it.
When overhead the station, with no change of heading at transit.
20. 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 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.
21. An aircraft is flying directly overhead a DME station at FL380. The indicated range will be approximately?
5.1 km.
5.1 nm.
6.3 nm.
6.3 km.
22. A DME transmitter is operating in the search-for-lock phase. Which of the following is true?
The PRF increases and the power is increased.
The PRF increases and the range counters count down from the maximum and the power decreases.
The PRF decreases and the range counters count down from the maximum and the power increases.
The PRF increases and the range counters count up to the maximum.
23. 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.
DME operates in the VHF frequency band.
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.
24. 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 - 2.25 NM.
+ or - 3.5 NM.
+ or - 1.25 NM.
25. 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?
20.88 NM.
17 NM,
15 NM.
21.35 NM.
26. 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?
186 NM.
296 NM.
165 NM.
330 NM.
27. When in tracking mode, the DME airborne interrogator operates at? Note: PRR = Pulse Recurrence Rate
A PRR of 2700 PPS (Pulse Per Second).
A PRR of 150 PPS.
A PRR fixed at a rate selected from the range 5 to 25 PPS.
A PRR variable between 5 and 25 PPS.
28. 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 nm.
300 km.
81 nm.
162 nm.
29. Distance Mesuring Equipment (DME) operates in the?
UHF band and uses two frequencies.
VHF band and uses the principle of phase comparison.
SHF and uses the frequency modulation techniques.
UHF band and uses one frequency.
30. 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?
Range of a DME system is always less than 200 NM
Aeroplane is below the 'line of sight' altitude
Aeroplane is circling around the station
Altitude is too high
31. Consider the following statement on horizontal/slant distance when using DME?
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 difference between the two is automatically compensated for in all DME equipment.
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.
32. 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?
300 m.
100 m.
600 m.
2000 m.
33. A DME in tracking mode subsequently experiences a reduction in signal strength will switch the equipment in the first instance to
Search mode.
Signal controlled search.
Standby mode.
Memory mode.
34. 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.
4.9 nm.
4.6 nm.
35. The indicated range from a DME station is?
0 when passing overhead the station.
Ground range.
Ground range only if the beacon is co-located with a VOR.
Slant range.
36. The most accurate measurement if ground speed by DME for an aircraft at 30000 feet will be when the aircraft is?
Tracking away from the beacon at 100 nm.
Tracking towards the beacon at 10 nm.
Passing abeam the beacon at 50 nm.
Overhead the beacon.
37. ICAO specifications are that range errors indicated by Distance Measuring Equipment (DME) should not exceed
+ or - 0.25 NM plus 1.25% of the distance measured.
+ or - 0.25 NM plus 3% of the distance measured up to a maximum of 5 NM.
+ or - 1.25 NM plus 0.25% of the distance measured.
+ or - 0.5 NM or 3% of the distance measured whichever is the greater.
38. Which one is the most correct statement regarding the range of the DME system?
Range within "line of sight" and maximum 200 nm.
Operates on VHF.
Operates on the principle of phase comparison.
Has unlimited range due to ground wave propagation.
39. 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 signal controlled search circuit (SCS) blanking the DME display.
The ground installation not sending any pulse-pairs.
The airborne installation switching directly to the search mode.
The airborne installation switching to the memory mode for about 10 to 15 seconds.
40. The DME line of Position is a circle with radius?
The ground distance and centre the aircraft.
A ground distance and centre the DME station.
The slant range and centre the aircraft.
The slant range and centre the DME station.
41. What is the approved frequency band assigned to DME?
962 to 1213 kHz.
329 to 335 MHz.
962 to 1213 MHz.
108 to 118 MHz.
42. 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.
43. The selection of the DME frequency for a ILS/DME installation is as follows?
The DME frequency is paired with the localiser frequency so only the localiser frequency is set.
When an ILS/DME is flown then the selection of the DME has always to be done manually.
The DME frequency has to be selected by the pilot.
The pilot has to insert the channel number and also the X or Y.
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 100 seconds.
It stays in the search mode at 150 PPPs.
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.
45. The DME counters are rotating continuously. This indicates?
The DME is trying to lock onto a frequency.
The DME is unserviceable.
The DME is trying to lock onto a range.
The DME is receiving no response from the ground station.
46. 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.
24.5 and 25.5 nm.
25.2 and 26.8 nm.
22.5 and 23.5 nm.
47. What is the maximum distance between VOR and DME/TACAN ground installations if they are to have the same morse code identifier?
60 m.
300 m.
600 m.
2000 m.
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 3000 microsecond. The slant range from the ground transponder was?
330 NM.
243 NM.
186 NM.
296 NM.
49. 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.
50. 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.
17 NM.
15 NM.
20.61 NM.
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