VDF – Air – DGCA Question Bank For Politics

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#1. 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

#2. VDF accuracy may be decreased by?

Diurnal variation.

Site and propagation errors

Night effect

Coastal effect

#3. 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:

158 NM.

107 NM.

114 NM.

134 NM.

#4. 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?

FL60

FL50

FL80

FL100

#5. 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

125 NM

155 NM

193 NM

#6. 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?

120 NM

150 NM

223 NM

210 NM

#7. 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.

#8. 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?

210 NM

295 NM

250 NM

274 NM

#9. 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?

FL120

FL150

FL180

FL100

#10. 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?

FL190

FL180

FL100

FL151

#11. What is the minimum level that an aircraft, at a range of 112 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 144 FT above MSL?

FL100

FL60

FL90

FL100

#12. 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?

FL90

FL60

FL80

FL100

#13. 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

Left drift

Zero drift

A wind from the west

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

VHF radio

VOR

None

VOR/DME

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

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

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

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

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

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

On first contact with ATC on crossing an international FIR boundary

When contacting ATC to join controlled airspace from the open FIR

When declaring an emergency on any frequency

When using the emergency VHF frequency 121.5 MHz

#17. What is a VDF referenced to?

Relative bearing to the aircraft.

True north at the aircraft.

Magnetic north at the station.

Magnetic north at the aircraft.

#18. 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?

180 nm.

150 nm.

120 nm.

220 nm.

#19. In ISA conditions, what is the maximum theoretical range at which an aircraft at FL80 can expect to obtain bearings from a ground VDF facility sited 325 ft above msl?

107 nm.

158 nm.

114 nm.

134 nm.

#20. 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?

FL60.

FL80.

FL50.

FL100.

#21. A radio beacon has an operational range of 10 nm. By what factor should the transmitter power be increased in order to achieve an operational range of 20 nm?

Four.

Eight.

Two

six

#22. VDF is the abbreviation for?

VDF Direction Finder.

Very Direction Finder.

Very High Frequency Deviation Finding Station.

VHF Direction Finder.

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

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

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

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

One VDF able to take bearings simultaneously on different frequencies.

#24. 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?

1,2 and 3.

1 and 2.

1 and 3.

#25. Range of VDF depends on? 1. Loudness of the voices of the pilots and the operator when transmitting. 2. power of airborne and ground transmitters. 3. power of pilot voice when transmitting. 4. aircraft altitude and ground transmitter elevation. The combination regrouping all of the correct statements is?

2 and 4.

3 and 4.

#26. One of the uses of the VDF is providing aircraft with?

Ground speed.

Homing.

Altitude.

Heading.

#27. A VDF may be used?

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

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

In combination with radar to solve a 180 degree ambiguity.

In lieu of ILS for precision approach purposes.

#28. What is the effect of multipath signals (coming from the same aircraft) at the Ground VHF Direction Finder Station?

It reduces the range at which the Ground VDF Direction Finder station receives signals from the aircraft .

Regardless of the difference in distance travelled by these signals, it results in their extinction of the signals at the Ground VHF Direction Finder station.

It may result in an increase in the distance at which Ground Direction Finder station receive signals from the aircraft , if the Ground Station is situated in the skip zone.

They may result in bearing errors.

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

Speaking louder

Flying out of clouds.

Increasing altitude.

Decreasing Altitude.

#30. 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.

Left drift.

Zero drift.

A wind from the west.

#31. Given: Compass heading 270° Deviation 2°W. Variation 30°E. Relative bearing of VDF station from the aircraft 316°. What is the QDR?

044°

226°

046°

224°

#32. By selecting one VHF frequency, in the range 108 to 112 MHz, on the NAV receiver?

Rho-theta information from an enroute VOR/DME can be obtained.

Rho-theta information from an ILS/DME can be obtained.

Rho-theta information from a terminal VOR/DME can be obtained.

Rho-theta information from enroute VORs can be obtained.

#33. VDF measures the bearing of the aircraft with?

Reference to the aircraft relative bearing.

Reference to the true and magnetic north at the station.

Reference to the true and magnetic north at the aircraft.

Reference to magnetic north at the aircraft.

#34. The VDF Class B bearing is accurate to within?

+/- 1 degrees.

+/- 5 degrees.

+/- 3 degrees.

+/- 2 degrees.

#35. When would VDF be used for a position fix?

When declaring an emergency on 121.5 MHz.

When the aircraft declares an emergency on any frequency.

When first talking to an FIR on crossing an international boundary

When joining controlled airspace from uncontrolled airspace.

#36. 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

#37. An aircraft wishing to use the VDF service must?

By within 10 nautical miles of the VDF aerial.

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

Be equipped with a VOR indicator unit.

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

#38. What equipment does an aircraft need when carrying out a VDF let-down?

None.

VOR

VOR/DME

VHF Radio.

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

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

VHF Compass operating in the 200 kHz range.

Cathode ray tube.

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

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

The controller, the controller.

The pilot, the pilot.

The pilot, the controller.

The controller, the pilot.

#41. Ground direction finding at aerodromes utilises which frequencies?

VHF at civil aerodromes, VHF at military aerodromes.

VHF at civil aerodromes, UHF at military aerodromes.

UHF at civil aerodromes, VHF at military aerodromes.

UHF at civil aerodromes, UHF at military aerodromes.

#42. The range at which you can obtain a VDF bearing can be influenced by?

Intensity of ionisation.

Surface type.

Aircraft height.

Time of day.

#43. . What is the purpose of a ground direction finder?

To map airfields.

To aid ground movements.

To aid pilot navigation.

To assist planners in the construction of airfield approaches.

#44. Which of the following affects VDF range?

Coastal refraction.

The height of the transmitter and the receiver.

The strength of the pilot's voice when transmitting.

Sky wave propagation.

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

Efficient VDF antennas.

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

Super refraction of the signals in the atmosphere.

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

#46. In VDF service the report "QDR 235, Class C" means?

The magnetic bearing from the aircraft to the station is 235+/- 10 degrees.

The magnetic bearing from the station to the aircraft is 235+/- 15 degrees.

The true bearing from the station to the aircraft is 235+/- 10 degrees.

The magnetic bearing from the station to the aircraft is 235+/- 10 degrees.

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

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

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

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

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

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

QDM

QDR

QUJ

QTE

#49. Which Q code would give a true track from a VDF station?

QDM

QDR

QUJ

QTE

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

QDM

QDR

QUJ

QTE

#51. With reference to a VDF bearing, the true bearing of the aircraft from the ground station is a?

QUJ

QTE

QDR

QDM

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

Greater.

Smaller.

Remains the same.

Not enough information to give an answer.

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

QTE accurate to +/-2 degrees.

QTE accurate to +/-5 degrees.

QDR accurate +/-2 degrees.

QUK accurate +/-3 degrees.

#54. What is QTE?

Magnetic track to the station.

Magnetic track from the station.

True track from the station.

True track to the station.

#55. In the VDF system directional antennas are used?

At the ground installation.

In the aircraft.

In the aircraft and at the ground installation.

No directional antennas are used.

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

Avoid banking when transmitting.

Not pass over the VDF station.

Transmit on 121.5 MHz.

Ensure that radio silence is maintained.

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

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

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 uses line of sight propagation.

#58. Which of the following is an advantage of VDF?

No equipment is required in the airgraft.

No special equipment is required in the aircraft or on the ground.

Only a VHF radio is required in the aircraft.

It is pilot interpreted, so ATC is not required.

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

The requesting aircraft is not from a consenting country.

The pilot does not use the prescribed terminology.

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

None of the above.

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

QTE accurate to +/-2 degrees.

QUJ accurate to +/-2 degrees.

QUJ accurate to +/-5 degrees.

QTE accurate to +/-5 degrees.

#61. . A Class C magnetic bearing is received from a station. This is?

QUJ accurate to +/-5 degrees.

QDM accurate to +/-10 degrees.

QTE accurate to +/-5 degrees.

QDR accurate to +/-10 degrees.

#62. When the pilot is conducting a QDM/QGH procedure, he will require?

No operator on the ground for either VDF or QGH procedures.

An operator on the ground only for VDF procedure.

An operator on the ground only for QGH procedure

An operator on the ground for both VDF and QGH procedures.

#63. The VDF homer service provides?

Accurate bearing on demand.

Bearings, which may be affected by synchronous transmissions.

A QGH procedure to transiting aircraft.

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

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

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

Course Deviation Indicator(CDI).

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

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

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

91 nm.

114 nm.

134 nm.

144 nm.

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

2 degrees.

3 degrees.

5 degrees.

7 degrees.

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

108 to 118 MHz.

108 to 136 MHz.

118 to 136 MHz.

130 to 300 MHz.

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

Increasing altitude.

Decreasing altitude.

Speaking louder.

Flying out of clouds.

#69. What is the Q code for a magnetic bearing from a VDF station?

QTE.

QDR.

QDM.

Finish

Dgca Question Bank For Pilots

Results

#1. 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?

#2. VDF accuracy may be decreased by?

#3. 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:

#4. 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?

#5. 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?

#6. 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?

#7. 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?

#8. 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?

#9. 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?

#10. 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?

#11. What is the minimum level that an aircraft, at a range of 112 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 144 FT above MSL?

#12. 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?

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

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

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

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

#17. What is a VDF referenced to?

#18. 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?

#19. In ISA conditions, what is the maximum theoretical range at which an aircraft at FL80 can expect to obtain bearings from a ground VDF facility sited 325 ft above msl?

#20. 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?

#21. A radio beacon has an operational range of 10 nm. By what factor should the transmitter power be increased in order to achieve an operational range of 20 nm?

#22. VDF is the abbreviation for?

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

#24. 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?

#26. One of the uses of the VDF is providing aircraft with?

#27. A VDF may be used?

#28. What is the effect of multipath signals (coming from the same aircraft) at the Ground VHF Direction Finder Station?

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

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

#31. Given: Compass heading 270° Deviation 2°W. Variation 30°E. Relative bearing of VDF station from the aircraft 316°. What is the QDR?

#32. By selecting one VHF frequency, in the range 108 to 112 MHz, on the NAV receiver?

#33. VDF measures the bearing of the aircraft with?

#34. The VDF Class B bearing is accurate to within?

#35. When would VDF be used for a position fix?

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

#37. An aircraft wishing to use the VDF service must?

#38. What equipment does an aircraft need when carrying out a VDF let-down?

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

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

#41. Ground direction finding at aerodromes utilises which frequencies?

#42. The range at which you can obtain a VDF bearing can be influenced by?

#43. . What is the purpose of a ground direction finder?

#44. Which of the following affects VDF range?

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

#46. In VDF service the report "QDR 235, Class C" means?

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

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

#49. Which Q code would give a true track from a VDF station?

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

#51. With reference to a VDF bearing, the true bearing of the aircraft from the ground station is a?

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

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

#54. What is QTE?

#55. In the VDF system directional antennas are used?

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

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

#58. Which of the following is an advantage of VDF?

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

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

#61. . A Class C magnetic bearing is received from a station. This is?

#62. When the pilot is conducting a QDM/QGH procedure, he will require?

#63. The VDF homer service provides?

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

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

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

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

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

#69. What is the Q code for a magnetic bearing from a VDF station?