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CPL Test Series
Question Bank
Questions for VDF
Answer the following questions
Test Mode
Training Mode
1. Which of the following statements regarding VHF Direction Finding (VDF) is most accurate?
It is simple and requires a VHF radio on the ground and in the aeroplane.
It is simple and requires a VHF radio and direction finding equipment in the aeroplane.
It uses line of sight propagation.
It is simple and only requires a VHF radio on the ground.
2. Which Q code would give a magnetic heading to steer (in nil wind) to a VDF station?
QUJ
QDR
QDM
QTE
3. Ground direction finding at aerodromes utilises which frequencies?
UHF at civil aerodromes, VHF at military aerodromes.
UHF at civil aerodromes, UHF at military aerodromes.
VHF at civil aerodromes, VHF at military aerodromes.
VHF at civil aerodromes, UHF at military aerodromes.
4. What is the purpose of a ground direction finder?
To assist planners in the construction of airfield approaches.
To aid pilot navigation.
To aid ground movements.
To map airfields.
5. 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
6. What is the Q code for a magnetic bearing from a VDF station?
QTE
QDR
QDM
QNH
7. An aircraft is "homing" to a radio beacon whilst maintaining a relative bearing of zero. If the magnetic heading increases, the aircraft is experiencing?
A wind from the west
Left drift
Zero drift
Right drift
8. What is QTE?
True track from the station.
Magnetic track from the station.
True track to the station.
Magnetic track to the station.
9. In the VDF system directional antennas are used?
No directional antennas are used.
At the ground installation.
In the aircraft and at the ground installation.
In the aircraft.
10. 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.
Course Deviation Indicator(CDI).
VHF Compass operating in the 500 kHz to 1000 kHz range.
VHF receiver operating in the 118 MHz to 136 MHz range.
11. Which of the following affects VDF range?
The strength of the pilot's voice when transmitting.
Sky wave propagation.
Coastal refraction.
The height of the transmitter and the receiver.
12. 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
295 NM
250 NM
13. 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.
14. 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?
193 NM
155 NM
220 NM
125 NM
15. When the pilot is conducting a QDM/QGH procedure, he will require?
An operator on the ground only for QGH procedure
No operator on the ground for either VDF or QGH procedures.
An operator on the ground for both VDF and QGH procedures.
An operator on the ground only for VDF procedure.
16. The minimum airborne equipment required for operation of a VHF Direction Finder is a?
Cathode ray tube.
VHF Compass operating in the 200 kHz range.
VHF Transmitter-receiver operating in the 118 MHz to 136 MHz range.
VHF receiver operating in the 118 MHz to 136 MHz range.
17. VDF for aeronautical use provides service in the frequency range?
130 to 300 MHz.
108 to 118 MHz.
108 to 136 MHz.
118 to 136 MHz.
18. If , when you are requesting a QDM from an airfield, you are offered a QGH, it means?
The bearing will only be accurate when the aircraft is flying above the QGH level.
The VDF unit is prepared to give you assistance during an approach to the airfield, based on VDF bearings.
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.
19. The pilot of an aeroplane requesting a VDF bearing should?
Not pass over the VDF station.
Avoid banking when transmitting.
Transmit on 121.5 MHz.
Ensure that radio silence is maintained.
20. A Class C magnetic bearing is received from a station. This is?
QTE accurate to +/-5 degrees.
QUJ accurate to +/-5 degrees.
QDM accurate to +/-10 degrees.
QDR accurate to +/-10 degrees.
21. An aircraft is "homing" to a radio beacon whilst maintaining a relative bearing of zero. If the magnetic heading decreases, the aircraft is experiencing?
Zero drift.
Left drift.
Right drift.
A wind from the west.
22. 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?
FL90
FL100
FL60
FL100
23. In VDF service the report "QDR 235, Class C" means?
The magnetic bearing from the station to the aircraft is 235+/- 10 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+/- 15 degrees.
The magnetic bearing from the aircraft to the station is 235+/- 10 degrees.
24. When would VDF be used for a position fix?
When first talking to an FIR on crossing an international boundary
When declaring an emergency on 121.5 MHz.
When joining controlled airspace from uncontrolled airspace.
When the aircraft declares an emergency on any frequency.
25. By selecting one VHF frequency, in the range 108 to 112 MHz, on the NAV receiver?
Rho-theta information from a terminal VOR/DME can be obtained.
Rho-theta information from enroute VORs can be obtained.
Rho-theta information from an ILS/DME can be obtained.
Rho-theta information from an enroute VOR/DME can be obtained.
26. 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?
114 nm.
134 nm.
158 nm.
107 nm.
27. What equipment does an aircraft need when carrying out a VDF let-down?
VHF Radio.
VOR
None.
VOR/DME
28. If a ground D/F controller passes a bearing thus: "your true bearing is 256 degrees, class Alpha . "This means?
QUK accurate +/-3 degrees.
QTE accurate to +/-2 degrees.
QTE accurate to +/-5 degrees.
QDR accurate +/-2 degrees.
29. With reference to ground DF, the controller can refuse to give a bearing if?
The pilot does not use the prescribed terminology.
The requesting aircraft is not from a consenting country.
Conditions are poor and bearings do not fall the station's classifications limits.
None of the above.
30. You intercept a QDM with aright crosswind component. Is your intercept heading greater or smaller than it would be without wind influence?
Not enough information to give an answer.
Greater
Smaller.
Remains the same.
31. An aircraft wishing to use the VDF service must?
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.
Transmit a signal for a long enough period for the bearing to be established.
32. In which one of the following circumstances is ground direction finding (VDF) likely to be used to fix an aircraft's position?
When using the emergency VHF frequency 121.5 MHz
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
33. Which Q code would give a true track from a VDF station?
QUJ
QTE
QDM
QDR
34. 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.
35. 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
150 NM
120 NM
36. 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 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
It only requires a VHF raido to the fitted to the aircraft
37. 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
FL80
FL100
FL50
38. 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?
88.4 nm.
70.7 nm.
88.4 km.
200 km.
39. A VDF may be used?
In lieu of ILS for precision approach purposes.
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 emergency type situations when the aircraft is unable to transmit on VHF.
40. What is the effect of multipath signals (coming from the same aircraft) 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.
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.
They may result in bearing errors.
It reduces the range at which the Ground VDF Direction Finder station receives signals from the aircraft .
41. A Class B bearing has accuracy limits of plus or minus?
3 degrees.
5 degrees.
7 degrees.
2 degrees.
42. 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.
2.
43. 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 controller.
The controller, the pilot.
The pilot, the pilot.
44. 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?
210 NM.
234 NM.
175 NM.
150 Nm.
45. Given: Compass heading 270° Deviation 2°W. Variation 30°E. Relative bearing of VDF station from the aircraft 316°. What is the QDR?
224°
046°
044°
226°
46. 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.
FL100
FL60.
FL80.
47. 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.
2
1
3 and 4.
48. Which of the following is an advantage of VDF?
Only a VHF radio is required in the aircraft.
No special equipment is required in the aircraft or on the ground.
No equipment is required in the airgraft.
It is pilot interpreted, so ATC is not required.
49. The range at which you can obtain a VDF bearing can be influenced by?
Aircraft height.
Intensity of ionisation.
Time of day.
Surface type.
50. 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?
FL150
FL120
FL180
FL100
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