Vayudoot Aviation

1. What is the minimum level that an aircraft. at a range of 113 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 169 FT above MSL?

FL50

FL100

FL80

FL60

2. Range of VDF depends on? 1. Line of sight formula. 2. Power of transmitter. 3. Intervening high ground. The combination regrouping all of the correct statements is?

1 and 2.

1 and 3.

1,2 and 3.

2.

3. The pilot of an aeroplane requesting a VDF bearing should?

Ensure that radio silence is maintained.

Not pass over the VDF station.

Transmit on 121.5 MHz.

Avoid banking when transmitting.

4. What airborne equipment, if any, is required to be fitted in order that a VDF let-down may be flown?

VHF radio

VOR

VOR/DME

None

5. What is the approximate maximum theoretical range at which an aircraft at FL120 could receive information from a VDF facility, which is sited 6000 FT above MSL?

234 NM.

210 NM.

175 NM.

150 Nm.

6. VDF accuracy may be decreased by?

Night effect

Diurnal variation.

Coastal effect

Site and propagation errors

7. If , when you are requesting a QDM from an airfield, you are offered a QGH, it means?

The VDF unit is prepared to give you assistance during an approach to the airfield, based on VDF bearings.

The bearing will only be accurate when the aircraft is flying above the QGH level.

The service will be limited to bearing , no position will be given by the DF station.

The VDF service will be handled by a different DF unit , operating on the same frequency.

8. An aircraft is "homing" to a radio beacon whilst maintaining a relative bearing of zero. If the magnetic heading increases, the aircraft is experiencing?

Right drift

A wind from the west

Left drift

Zero drift

9. To provide a pilot with the position of the aircraft in the absence of radar, ATC must have at its disposal at least?

Three VDFs at different locations, able to take bearings simultaneously on different frequency.

Two VDFs at different locations, able to take bearings simultaneously on the transmitted frequency.

Two co-located VDFs, able to take bearings simultaneously on te transmitted frequency.

One VDF able to take bearings simultaneously on different frequencies.

10. The VDF homer service provides?

A QGH procedure to transiting aircraft.

Bearings, which will normally be within +/-5 degrees accuracy to a 20 nm range.

Bearings, which may be affected by synchronous transmissions.

Accurate bearing on demand.

11. What is the approximate maximum theroretical range at which an aircraft at FL 130 could receive information from a VDF facility, which is sited 1024 ft above MSL?

120 nm.

150 nm.

220 nm.

180 nm.

12. What is the approximate maximum theoretical range at which an aircraft at FL140 could receive information from a VDF facility, which is sited 1050 FT above MSL?

220 NM

155 NM

125 NM

193 NM

13. What is the purpose of a ground direction finder?

To aid ground movements.

To assist planners in the construction of airfield approaches.

To map airfields.

To aid pilot navigation.

14. Ground direction finding at aerodromes utilises which frequencies?

VHF at civil aerodromes, UHF at military aerodromes.

UHF at civil aerodromes, VHF at military aerodromes.

VHF at civil aerodromes, VHF at military aerodromes.

UHF at civil aerodromes, UHF at military aerodromes.

15. The minimum airborne equipment required for operation of a VHF Direction Finder is a?

Cathode ray tube.

VHF receiver operating in the 118 MHz to 136 MHz range.

VHF Compass operating in the 200 kHz range.

VHF Transmitter-receiver operating in the 118 MHz to 136 MHz range.

16. What airborne equipment, if any, is required to be fitted on order that a VDF let-down may be flown?

VOR/DME

VHF Radio

None

VOR

17. VDF measures the bearing of the aircraft with?

Reference to the true and magnetic north at the aircraft.

Reference to the aircraft relative bearing.

Reference to magnetic north at the aircraft.

Reference to the true and magnetic north at the station.

18. When conducting a QGH approach responsibility for interpreting the procedure rests with ..... And on a QDM approach responsibility rests with.....?

The pilot, the controller.

The controller, the pilot.

The controller, the controller.

The pilot, the pilot.

19. An aircraft receives a Class a true bearing from a VDF station. This is?

QTE accurate to +/-2 degrees.

QTE accurate to +/-5 degrees.

QUJ accurate to +/-5 degrees.

QUJ accurate to +/-2 degrees.

20. A Class B bearing has accuracy limits of plus or minus?

2 degrees.

7 degrees.

3 degrees.

5 degrees.

21. What is the minimum level that an aircraft, at a range of 133.5 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 144 FT above MSL?

FL80

FL60

FL90

FL100

22. An aircraft is "homing" to a radio beacon whilst maintaining a relative bearing of zero. If the magnetic heading decreases, the aircraft is experiencing?

Right drift.

Zero drift.

Left drift.

A wind from the west.

23. At a height of 5000 feet you might expect to receive a VHF signal, from a transmitter located at sea level, at a range of?

70.7 nm.

200 km.

88.4 nm.

88.4 km.

24. An aircraft wishing to use the VDF service must?

Transmit a signal for a long enough period for the bearing to be established.

By within 10 nautical miles of the VDF aerial.

Be equipped with a VOR indicator unit.

Ask the controller to transmit for a long enough period to establish the bearing.

25. One of the uses of the VDF is providing aircraft with?

Altitude.

Heading

Ground speed.

Homing.

26. Abnormal long ranges may be experienced on VDF channels, caused by?

The VDF station using a relay station for communication to the aircraft.

Efficient VDF antennas.

Super refraction of the signals in the atmosphere.

Intermodulation with signals on frequencies close to the one being used by the VDF station.

27. What is the approximate maximum theoretical range at which an aircraft at FL130 could receive information from a VDF facility, which is sited 1024 FT above MSL?

180 NM

220 NM

120 NM

150 NM

28. You intercept a QDM with aright crosswind component. Is your intercept heading greater or smaller than it would be without wind influence?

Smaller.

Remains the same.

Greater

Not enough information to give an answer.

29. VDF is not affected by the other options listed in this question. The maximum theoretical range at which an aircraft at which an aircraft at FL80 can obtain bearings from a ground VDF facility sited 325 FT above MSL is

107 NM.

114 NM.

158 NM.

134 NM.

30. If a ground D/F controller passes a bearing thus: "your true bearing is 256 degrees, class Alpha . "This means?

QTE accurate to +/-5 degrees.

QDR accurate +/-2 degrees.

QTE accurate to +/-2 degrees.

QUK accurate +/-3 degrees.

31. What is the approximate maximum theoretical range at which an aircraft at FL240 could receive information from a VDF facility, which is sited 1023 FT above MSL?

210 NM

223 NM

120 NM

150 NM

32. What is QTE?

Magnetic track from the station.

True track from the station.

Magnetic track to the station.

True track to the station.

33. What is the minimum level that an aircraft, at a range of 170 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 169 FT above MSL?

FL151

FL190

FL180

FL100

34. VDF for aeronautical use provides service in the frequency range?

118 to 136 MHz.

108 to 118 MHz.

130 to 300 MHz.

108 to 136 MHz.

35. The minimum airborne equipment required for operation of a VHF Direction Finder is a?

VHF receiver operating in the 118 MHz to 136 MHz range.

VHF Compass operating in the 500 kHz to 1000 kHz range.

VHF Transmitter-receiver operating in the 118 MHz to 136 MHz range.

Course Deviation Indicator(CDI).

36. In flight, a pilot can improve the range of his transmission with a VDF operator by?

Decreasing Altitude.

Increasing altitude.

Flying out of clouds.

Speaking louder

37. In the VDF system directional antennas are used?

In the aircraft.

At the ground installation.

No directional antennas are used.

In the aircraft and at the ground installation.

38. Which Q code would give a magnetic heading from a VDF station?

QTE

QUJ

QDM

QDR

39. What is the approximate maximum theoretical range at which an aircraft at FL200 could receive information from a VDF facility, which is sited 6000 FT above MSL?

274 NM

210 NM

250 NM

295 NM

40. What is the minimum level that an aircraft, at a range of 153 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 169 FT above MSL?

FL180

FL120

FL150

FL100

41. In which one of the following circumstances is ground direction finding (VDF) likely to be used to fix an aircraft's position?

When declaring an emergency on any frequency

When contacting ATC to join controlled airspace from the open FIR

On first contact with ATC on crossing an international FIR boundary

When using the emergency VHF frequency 121.5 MHz

42. What is the maximum range at which a VDF station at 235 feet can provide a service to an aircraft at FL 100?

134 nm.

91 nm.

114 nm.

144 nm.

43. Which of the following is an advantage of Ground/DF (VDF) let-down?

It is pilot interpreted and does not require the assistance of ATC

It does not require any special equipment, apart from a VHF radio, to be installed in the aircraft or on the ground

It only requires a VHF raido to the fitted to the aircraft

It does not require any special equipment to be fitted to the aircraft

44. Which of the following affects VDF range?

The strength of the pilot's voice when transmitting.

Coastal refraction.

Sky wave propagation.

The height of the transmitter and the receiver.

45. With reference to ground DF, the controller can refuse to give a bearing if?

The pilot does not use the prescribed terminology.

None of the above.

The requesting aircraft is not from a consenting country.

Conditions are poor and bearings do not fall the station's classifications limits.

46. In flight a pilot can improve the range of his transmission with a VDF operator by?

Decreasing altitude.

Speaking louder.

Increasing altitude.

Flying out of clouds.

47. Which Q code would give a magnetic heading to steer (in nil wind) to a VDF station?

QTE

QUJ

QDM

QDR

48. Which of the following statements regarding VHF Direction Finding (VDF) is most accurate?

It uses line of sight propagation.

It is simple and requires a VHF radio and direction finding equipment in the aeroplane.

It is simple and requires a VHF radio on the ground and in the aeroplane.

It is simple and only requires a VHF radio on the ground.

49. What is the maximum level that an aircraft at a range of 113 nm, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited at 169 ft above MSL?

FL50.

FL80.

FL100

FL60.

50. A VDF may be used?

To provide the ATC controller with bearing of aircraft in the absence of radar.

In combination with radar to solve a 180 degree ambiguity.

In lieu of ILS for precision approach purposes.

In emergency type situations when the aircraft is unable to transmit on VHF.

Question Bank

Questions for VDF