VHF OMNI-DIRECTIONAL RANGE (VOR)

Question 1

1. Assuming the maximum likely error in VOR to be 5.5°, what is the maximum distance apart that beacons can be situated on the centre line of a UK airway in order that an aircraft can guarantee remaining within the airway boundary?

Answer 1

109 nm

Question 2

2. The Designated Operational Coverage quoted for VOR beacons in the COMM section of the Air Pilot:

Answer 2

defines the airspace within which an aircraft is assured of protection from interference
from other VORs on the same channel.

Question 3

4. What is the theoretical maximum range that an aircraft at flight level 360 will obtain from a VOR beacon situated at 900 ft above mean sea level?

Answer 3

274 nms

Question 4

5. A Conventional VOR:

Answer 4

has an FM reference signal and an AM variable signal

Question 5

6. The OBS on a deviation indicator is set to 330° and gives a 3 dots fly right demand with FROM indicated. What is the QDM of the aircraft to the station?

Answer 5

144

Question 6

7. An aircraft is homing towards a VOR which marks the centre line of an airway. The beacon is 100 nms distant. If the pilot had the airway QDM set on the OBS what deflection of the deviation indicator would be given if the aircraft was on the boundary of the airway? Assume that one dot equals 2 degrees.

Answer 6

1.5 dots

Question 7

8. What is the theoretical maximum range that an aircraft at flight level 420 will obtain from a VOR beacon situated at 400 ft above mean sea level?

Answer 7

281 nm

Question 8

9. Concerning conventional and Doppler VORs (DVOR), which of the following is correct?
   a. There is no way of knowing from the instrumentation display which type is being used.
   b. The DVOR will always have a “D” in the ident.
   c. The DVOR has a higher pitch ident than the standard VOR.
   d. The conventional VOR has less site error.

Answer 8

There is no way of knowing from the instrumentation display which type is being used

Question 9

10. In a Doppler VOR (DVOR) the reference signal is ……………, the bearing signal is …………… and the direction of rotation of the bearing signal is …………….

Answer 9

AM, FM, anti-clockwise

Question 10

11. An aircraft is attempting to home to a VOR on the 064 radial. The CDI shows 4 dots fly right with a TO indication. At the same time the co-located DME shows a range of 45 nm. Where is the aircraft in relation to the required track?

Answer 10

6 nm left of track

Question 11

12. A VOR beacon ceases to transmit its normal identification which is substituted by ‘TST’. This means that:

Answer 11

the beacon is undergoing maintenance or calibration and should not be used

Question 12

13. What is the approximate maximum range that an aircraft flying at 25,000 ft would expect to obtain from a VOR beacon situated 900 ft above mean sea level?

Answer 12

235nm

Question 13

14. An aircraft is on the airway boundary range 100 nm from a VOR marking the airway centre line. Assuming that each dot equates to 2° how many dots deviation will be shown on the deviation indicator?

Answer 13

1.5 dots

Question 14

15. An aircraft is required to intercept and home to a VOR along the 064 Radial. The OBS should be set to:

Answer 14

244 to get correct needle sense and a TO indication

Question 15

18. AN aircraft, heading 150°, is 100 nm north of a VOR, the pilot intends to home to the VOR on the 030 radial. The pilot should set ….. on the OBS and on reaching the 030 radial should turn ….. onto a heading of ….., assuming zero wind.

Answer 15

210, right, 210

Question 16

19. The type of emission radiated by a VOR beacon is:

Answer 16

a single channel VHF carrier wave amplitude modulated at 30 Hz with a sub carrier being frequency modulated at 30 Hz

Question 17

20. An aircraft wishes to track towards a VOR along the 274 radial. If variation is 10° W what should be set on the OBS?

Answer 17

094

Question 18

21. An aircraft is tracking away from a VOR on a heading of 287°M with 14° starboard drift. If the variation is 6°W what is the phase difference between the reference and variable phase components of the VOR transmission?

Answer 18

301°

Question 19

22. What is the theoretical maximum range that a pilot would obtain from a VOR situated 900 ft above mean sea level in an aircraft flying at 18,000 ft?

Answer 19

205nm

Question 20

23. An aircraft is attempting to home to a VOR beacon. The pilot has set 329 on the OBS of the deviation indicator. If the aircraft is situated on the 152 radial then the deviation indicator will show:

Answer 20

one and a half dots fly right

Question 21

24. A VOR receiver in an aircraft measures the phase difference from a DVOR as 220°. Which radial is the aircraft on?

Answer 21

220

Question 22

25. The RMI indicates the aircraft magnetic heading. To convert the RMI bearings of NDBs andVORs to true bearings, the correct combination for the application of magnetic variation is:

Answer 22

NDB, aircraft position

VOR, beacon position

Question 23

28. The normal maximum error which might be expected with a VOR bearing obtained within the DOC is:

Answer 23

plus or minus 5°

Question 24

30. The VOR indications on an RMI whose deviation is not zero:

Answer 24

are magnetic