Email
info@vayudootaviation.com
Phone No
+91 7276526726
become a pilot
Home
About us
courses
CPL
ATPL
RTR(A)
Airline Cadet Program
IGRUA Entrance Prep
B.Sc. Aviation
Pilot Training
INDIA
USA
CANADA
SOUTH AFRICA
NEW ZEALAND
EUROPE
Aircraft Type-Rating
Airbus A320
Boeing 737
Blogs
contact
CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. Aircraft position 36 degrees 15 minutes S 178 degrees E, magnetic variation 00021 degrees W, FL310. UEB VOR/DME position 36 degrees 15'S 178 degrees W, magnetic variation 21 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 UEB radial?
291 degrees.
111 degrees.
249 degrees.
069 degrees.
2. 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 aircraft is too high to receive the signal.
The aircraft is too low to receive the signal.
The beacon is saturated.
3. 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.
17 NM,
21.35 NM.
20.88 NM.
4. 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 supporting the same site, but are not co-located.
The two beacons are greater than 2000 metres apart.
The two beacons are co-located.
5. What are the DME frequencies?
960 to 1090 MHz.
1030 to 1215 MHz.
690 to 1215 MHz.
960 to 1215 MHz.
6. DME is a .. Radar which, provides .. Distances between the aircraft and a ground ..?
Secondary, slant, transponder.
Secondary, earth, transponder.
Primary, slant, transponder.
Primary, accurate, transmitter.
7. DME channels utilise frequencies of approximately
600 MHz.
110 MHz.
1000 MHz.
300 MHz.
8. 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.
9. 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 100 seconds.
Stays in search mode without a reduction in PRF.
Stays in search mode but reduces PRF to max. 60 PPS after 15000 pulse pairs have been transmitted.
Alternates search mode with periods of memory mode lasting 10 seconds.
10. 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?
0.31 nm.
0.57 nm.
0.09 nm.
1.42 nm.
11. 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.
12. The aircraft DME receiver is able to accept replies to its own transmissions and reject replies to other aircraft interrogations because
Aircraft interrogation signals and transponder responses are 63 MHz removed from each other.
Transmission frequencies are 63 MHz different for each aircraft.
Pulse pairs are discreet to a particular aircraft.
Pulse pairs are amplitude modulated with the aircraft registration.
13. 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.
14. 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 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.
DME callsign is the one with the higher pitch that was broadcast only once.
DME callsign was not transmitted, the distance information is sufficient proof of correct operation.
The VOR IDENT is transmitted three times followed by the DME IDENT transmitted once.
15. What is the approved frequency band assigned to DME?
108 to 118 MHz.
329 to 335 MHz.
962 to 1213 MHz.
962 to 1213 kHz.
16. If a DME beacon becomes saturated by interrogations it?
Switches off its identification.
Replies to the nearest 100 aircraft.
Adjusts its PRF to cope with all aircraft.
Adjusts the gain to reply to the 100 strongest signals.
17. 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?
7 NM.
6 NM.
11 NM.
8 NM.
18. An aircraft at FL310 cannot receive a signal from a DME 240 nm away. Why?
DME is never more than 200 nm.
The aircraft is not in line-of-sight of the DME.
The aircraft is too high.
The DME is saturated.
19. 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 overhead the station, with no change of heading at transit.
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.
20. The design requirements for DME stipulate that, at a range of 100 NM, the maximum systematic error should not exceed
+ or - 1.25 NM.
+ or - 3.5 NM.
+ or - 2.25 NM.
+ or - 1.5 NM.
21. 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.
186 NM.
165 NM.
330 NM.
22. DME pulses are transmitted as pulse pairs. This is done?
So that any radar emissions do not interfere with the DME equipment.
So that pulses are square and easily identified.
To prevent lock onto the ground.
To increases the range.
23. How many aircraft will DME accommodate before reaching saturation?
150
100.
120
50
24. For a conventional DME facility 'Beacon saturation' will occur whenever the number of simultaneous interrogation exceeds
60.
100.
80
200
25. What is the function of the Echo Protection Circuit (EPC)?
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.
The EPC has to protect the transponder-receiver against reflected pulse-pairs.
The EPC has to detect if pulse-pairs reflected by the ionosphere are interfering with directly received pulse-pairs.
26. Which statement about the interrogation by DME interrogator is correct?
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 does not start before pulse-pairs of the tuned DME station are received.
The interrogation starts when the interrogator has been warmed up sufficiently, whether pulse-pairs are received or not.
27. The DME (Distance Measuring Equipment) operates within the following frequencies
962 to 1213 MHz.
962 to 1213 kHz.
108 to 118 MHz.
329 to 335 MHz.
28. ICAO specifications are that range errors indicated by Distance Measuring Equipment (DME) should not exceed
+ or - 1.25 NM plus 0.25% of the distance measured.
+ 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 - 0.5 NM or 3% of the distance measured whichever is the greater.
29. 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.
When the distance presented is above 50 nm.
Which first switched on and after channel change.
At all times, except when the panel control "LO" is operated.
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
Altitude is too high
Aeroplane is circling around the station
31. What happens when a DME in the search mode fails to achieve lock-on?
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.
It stays in the search mode, but reduces to 60 pulse-pairs per second (PPPS) after 100 seconds.
32. 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.
194 degrees.
166 degrees
346 degrees.
33. 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?
Altitude is too high.
Range to DME stations is always less than 200 nm.
Aeroplane is circling around the station.
Aeroplane is below the line-of-sight altitude.
34. Distance Measuring Equipment (DME) uses radar principles to measure distance?
Horizontally.
Vertically.
Slant range.
Plan range.
35. Groundspeed measurement using DME equipment is most accurate when flying?
Past the station at short range.
Directly over the station.
Towards the station at short range.
From the station at long range.
36. Which of the following provides distance information?
VOR
ADF
DME
VDF
37. The maximum number of aeroplanes that can be responded to by the DME ground facility is?
150.
100.
10.
unlimited
38. 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 km.
6.1 nm.
6.8 km.
39. 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.
11.7 nm.
8 nm.
40. The time interval between a transmitted DME pulse and the reply pulse is 120 microsecond. The slant range is?
9.7 nm.
5.7 km.
9.7 km.
5.7 nm.
41. 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 horizontal distance is always slightly longer than the slant distance.
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.
42. An aircraft DME receiver does not lock on to its own transmissions reflected from the ground because
The pulse recurrence rate are varied.
They are not on the receiver frequency.
DME uses the UHF band.
DME transmits twin pulses.
43. Which one the statements below is correct regarding the DME?
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.
The indicated distance is the ground distance measured from the aircraft's projected position on the ground to the DME ground installation.
44. Of what use, if any, is a military TACAN station to civil aviation?
It can provide a DME distance and magnetic bearing.
It can provide DME distance.
It can provide a magnetic bearing.
It is of no use to civil aviation.
45. Distance Measuring Equipment (DME) operates in the
UHF band and is a primary radar system.
VHF band and uses the principle of phase comparison.
UHF band and is a secondary radar system.
SHF band uses frequency modulation techniques.
46. 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?
11.35 NM.
13.44 NM.
12 NM.
10.44 NM.
47. An aircraft passes overhead a DME station at 12000 ft above the station. At that time the DME reading will be?
0 nm.
Approximately 2 nm.
FLAG/OFF, the aircraft is within the cone of silence.
Fluctuating and not significant.
48. 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 IDS will be in all respects identical.
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.
49. 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.
50. 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.
330 NM.
296 NM.
186 NM.
Submit
Make New Set
