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CPL Test Series
Question Bank
Questions for DME
Answer the following questions
Test Mode
Training Mode
1. Distance Measuring Equipment is an example of _________ radar operating on a frequency of _______ in the __________ band
primary 9375 MHz SHF
secondary 962 MHz UHF
secondary 1030 MHz UHF
primary 8800 MHz SHF
2. A DME beacon having a transmit frequency of 962 MHz would have a receive frequency of
902 Mhz
1030 Mhz
962 Mhz
1025 Mhz
3. A DME receiver is able to distinguish between replies to its own interrogations and replies to other aircraft because
DME transponders reply to interrogations with twin pulses and the airborne equipment ejects all other pulses.
Each aircraft transmits pulses at a random rate and will only accept synchronised replies.
DME is secondary radar and each aircraft transmits and receives on a different frequency.
When DME is in the search mode it will only accept pulses giving the correct range.
4. DME is a …………. radar operating in the …. band and uses………… in order to obtain range information. The correct words to complete the above statement are
secondary UHF twin pulses
primary SHF CW signals
primary UHF pulse pairs
secondary SHF “jittered pulses”
5.
The VOR in an aircraft is correctly tuned and set to define the centre line of an airway within UK airspace which you intend to fly. The indication received on the VOR/ILS deviation indicator is shown in the diagram alongside. At the same time the DME gave a range of 40 nm from the facility. Use the above information to answer the next two questions. Use the 1 in 60 rule and assume 1 dot equals 2°. At the time of the observation, the aircraft was on the
048° radial
042° radial
228° radial
222° radial
6. DME operates in the frequency band, it transmits which give it the emission designator of
EHF twin pulses A9F
UHF double pulses J3E
SHF double size pulses PO1
UHF twin pulses PON
7.
The VOR in an aircraft is correctly tuned and set to define the centre line of an airway within UK airspace which you intend to fly. The indication received on the VOR/ILS deviation indicator is shown in the diagram alongside. At the same time the DME gave a range of 40 nm from the facility. Use the above information to answer the next two questions. Use the 1 in 60 rule and assume 1 dot equals 2°. Assuming still air conditions, on regaining the centreline, it will be necessary to make the following alteration of heading:
left onto 225°
left onto 045°
right onto 225°
right onto 048°
8. A DME receiver is able to distinguish between replies to its own interrogation pulses and those intended for other aircraft using the same transponder because
DME transponders reply to interrogations by means of twin pulses and the airborne equipment rejects all single pulses.
DME is a secondary radar and each aircraft transmits and receives on a different frequency.
each aircraft transmits pulses at a random rate(“jittering”) and will only accept replies that match this randomisation.
when DME is in the range search mode it will accept only pulses separated by + or - 63 MHz from the interrogation frequency.
9. The receiver of airborne DME equipment is able to “lock on” to its own “reply pulses” because
each aircraft has its own unique transmitter frequency and the receiver only accepts reply pulses having this frequency.
the reply pulses from the ground transmitter have the same frequency as the incoming interrogation pulses from the aircraft.
the aircraft receiver only accepts reply pulses which have the same time interval between successive pulses as the pulses being transmitted by its own transmitter.
the aircraft receiver only accepts reply pulses which arrive at a constant time interval.
10. An aircraft flying at FL250 wishes to interrogate a DME beacon situated 400ft amsl. What is the maximum range likely to be achieved?
222 nm
210 nm
198 nm
175 nm
11. The transmission frequency of a DME beacon is 63 MHz removed from the aircraft interrogator frequency to prevent
the airborne receiver locking on to primary returns from its own transmissions.
interference from other radars.
receiver accepting replies intended for other interrogators.
static interference.
12. The range indicated by DME is considered to be accurate to within
0.5 nm
+/-0.25 nm +/-1.25% of range
1.25 % of range
3% of range
13. The accuracy associated with DME is
+ or - 3% of range
+/-0.25 nm +/-1.25% of range
+ or - 3% of range, or 0.5nm, whichever is greater
+ or - 1.25% of range
14. DME and VOR are “frequency paired” because
both ground transmitter aerials can be placed on the same site if required.
cockpit workload is reduced.
the same receiver can be used for both aids.
the VOR transmitter is easily converted to the required DME frequency
15. Airborne DME equipment is able to discriminate between pulses intended for itself and pulses intended for other aircraft because
aircraft transmit and receive on different frequencies.
each aircraft has its own frequency allocation.
aircraft will only accept unique twin pulses.
aircraft reject pulses not synchronised with its own random pulse recurrence rate.
16. When a DME transponder becomes saturated
it increases the receiver threshold to remove weaker signals.
it goes into a selective response mode of operation.
it reverts to standby.
it increases the number of pulse pairs to meet the demand.
17. For a VOR and a DME beacon to be said to be associated the aerial separation must not exceed_ ______ in a terminal area and _______ outside a terminal area
30m 600m
50 feet 200 feet
50 m 200 m
100 m 2000 m
18. For a DME and a VOR to be said to be associated it is necessary for
both beacons to have the same first two letters for their ident' but the last letter of the DME to be a ‘Z'.
the aerial separation not to exceed 100 feet in a TMA or 2000 feet outside a TMA
the DME to transmit on the same VHF frequency as the VOR.
the aerial separation not to exceed 100 metres in a TMA or 2000m outside a TMA.
19. Referring to DME during the initial stage of the “search” pattern before “lock-on”
the ground receiver maintains the ground transmitter pulse transmission rate at no more than 150 per second
the aircraft transmits 24 pulses per second and the receiver checks a maximum of 150 pulses per second
the airborne receiver checks 150 pulses each second.
the airborne transmitter transmits 150 pulses each second
20. A VOR/DME share the same first two letters of their respective identifiers; the last identifying letter of the DME is a Z. This means that
they are more than 600m apart but serve the same location.
they are co-located.
they are a maximum distance of 30m apart.
they are widely separated and do not serve the same location.
21. A DME transponder does not respond to pulses received from radars other than DME because
DME only responds to the strongest 100 interrogators.
DME transmits and receives on different frequencies.
each aircraft transmits pulses at a random rate.
it will only accept the unique twin DME pulses.
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