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CPL Test Series
Question Bank
Questions for ILS
Answer the following questions
Test Mode
Training Mode
1. The ILS marker with the higher aural frequency is the?
Locator
Outer marker.
Inner marker.
Middle marker.
2. Assuming a five dot display on either side of the ILS localiser cockpit display. What is the angular displacement of the aircraft from the localiser centreline when the CDI is deflected 2 dots to the right?
1.0 degrees to the left.
1.0 degrees to the right.
2.0 degrees to the right.
2.0 degrees to the left.
3. On final on ILS approach, at 0.6 nm from the threshold, which marker are you likely to hear?
The middle marker.
The inner marker (if available).
NO markers can be located at this distance.
The outer marker.
4. Outer marker beacon of an ILS transmit at?
It depends on the modulating frequency.
150 MHz.
75 MHz.
90 Hz.
5. Fill scale deflection of the localiser needle indicates that the aircraft is approximately?
2.5 degrees offset from the localiser centreline.
5 degrees offset from the localiser centreline.
10 degrees offset from the localiser centreline.
1.25 degrees offset from the localiser centreline.
6. The ILS middle marker modulation frequency is?
3000 Hz.
1300 Hz.
800 Hz.
400 Hz.
7. What according to ICAO Annex 10, is the range of a locator?
100 to 300 nm.
50 to 100 nm.
25 to 50 nm.
10 to 25 nm.
8. The ILS receiver of an aircraft on approach and flying on the glide path will receive?
The same modulation frequency signal from both lobes with the maximum of magnitute.
The modulation from both lobes at equal depth.
The maximum magnitude of the difference between the two amplitdes.
No modulated signal because the left and right lobes cancel each other along the centreline.
9. The localiser transmits in?
The UHF band.
Both the UHF and the VHF bands.
The VHF band.
The HF band.
10. An ILS receiver?
Measures the difference in frequency of modulation of the transmitted signals.
Measures the phase difference of the transmitted signals.
Measures the phase rotation of the transmitted signals.
Measures the difference in depth of modulation of the transmitted signals.
11. The ILS marker identified by a series of dots (6/sec) is the?
Outer marker.
Locator.
Inner marker.
Middle marker.
12. The heading rose of an HSI is frozen on 200 degrees. Lined up with the ILS of runway 25, the localiser will be?
Left of centre.
Centred with the "Fail" flag showing.
Right of centre.
Centred.
13. Which of the following is an ILS localiser frequency?
112.10 MHz.
109.15 MHz.
110.20 MHz.
108.25 MHz.
14. What is measured in order to establish aircraft position in relation to the localiser beam on an ILS?
The difference in depth between the 90 Hz and the 150 Hz modulations.
The difference in time between the 90 Hz and the 150 Hz modulations.
The bearing of the localiser antenna found by means of a loop antenna.
The difference in phase between the 90 Hz and the 150 Hz modulations.
15. A VOR is situated at the far end of the runway on which an aircraft is making an ILS approach. Nav 1 is switched to the localiser frequency and Nav 2 to the VOR frequency. At the moment that the needle of #1 indicator reaches the outer dot the deflection needle of #2 indicator will be at?
Approximately a quarter of the scale.
The outer dot.
Approximately a halfway the scale.
Approximately a three quarters of the scale.
16. The principle of operation of an localiser transmiter is based on two overlapping lobes that are transmitted on (i) .............. frequencies and carry different (ii) ..................
(i) different (ii) phases.
(i) the same (ii) modulation frequencies.
(i) the same (ii) phases.
(i) different (ii) modulation frequencies.
17. The ILS marker with the lower aural frequency is the?
Outer marker.
Centreline marker.
Inner marker.
Middle marker.
18. The back CRS of an ILS may give?
Precision approach guidance for the main approach runway.
Non-precision approach guidance for the main approach runway.
Non-precision approach guidance for the reciprocal of the main approach runway.
Precision approach guidance for the reciprocal of the main approach runway.
19. Inner marker beacon of an ILS transmit at?
It depends on the modulating frequency.
75 MHz.
90 Hz.
150 MHz.
20. What is the function of the FM-immune filter?
To make both the ILS localiser and the glide slope receiver less susceptible to interference from commercial FM-stations (radio and television).
To make the ILS localiser receiver less susceptible to interference from commercial FM-stations (radio and television).
To make the ILS localiser receiver less susceptible to interference from earth-reflected localiser signals.
To make both the ILS localiser and the glide slope receiver less susceptible to interference from earth-reflected localiser signals.
21. The ILS marker identified visually by a white flashing light is the?
Middle marker.
Inner marker.
Outer marker.
Locator
22. The ILS marker identified audibly by a series of two dashes per second is the?
Middle marker.
Outer marker.
Locator
Inner marker.
23. The principles of operation of an ILS is?
The difference between the frequencies of the tow tones.
The phase comparison.
Modulation of the ILS frequency by amplitude of two modulating signals.
The difference in depth of modulation.
24. Concerning the localiser principle of operation in an ILS, the difference in depth of modulation(DDM): 1. Decreases with respect to the angular displacement from the centreline. 2. Increases with right displacement from the cenreline. 3. Decreases with left displacement from the centreline. 4. Increases linearly with displacement from the centreline. The combination regrouping all of the correct statements is?
1 and 3.
2 and 4.
1 and 4.
2 and 3.
25. The ILS marker with an aural frequency of 400 Hz is?
Locator.
Inner marker.
Outer marker.
Middle marker.
26. Which approximate rate of descent is required in order to maintain a 3° glide path at a groundspeed of 90kt?
700 FT/MIN.
600 FT/MIN.
450 FT/MIN.
400 FT/MIN.
27. Which of the following correctly describes the Instrument Landing System (ILS) localiser rediation pattern?
Two overlapping lobes on the same VHF carrier frequency.
A pencil beam comprising a series of smaller beams each carrying different modulation.
Two overlapping lobes on different radio carrier frequency but with the same modulation.
Two overlapping lobes on the same UHF carrier frequency.
28. The amplitude modulation and the colour of an outer marker (OM) is
400 Hz, blue.
400 Hz, amber.
3000 Hz, blue.
1300 Hz, blue.
29. On an ILS approach, when flying overhead the outer marker the colour of the flashing light will be?
Blue.
White.
Amber
Green.
30. Locators are: 1. High powered NDBs used for en route and airways. 2. Low powered NDBs used for airfield airfield runway approach. 3. Beacons with a usually range of 10 to 250 nm. 4. Beacons with a usually range of 10 to 25 nm. The combination regrouping all of the correct statements is?
1 and 3.
1 and 4.
2 and 3.
2 and 4.
31. On an ILS approach, when flying overhead the middle marker the colour of the flashing light will be?
Green.
Blue.
White.
Amber.
32. According to ICAO Annex 10 a locator has a range of?
75 to 250 nm.
10 to 25 nm.
7.5 to 15 nm.
75 to 150 nm.
33. The ILS marker identified visually by an amber flashing light is the?
Middle marker.
Outer marker.
Locator
Inner marker.
34. Concerning the localiser principle of operation in an ILS system, the difference in depth of modulation (DDM)?
Increases linearly with respect to the distance from the centreline.
Increases linearly with respect to the angular displacement from the centreline.
Decreases with respect to the angular displacement from the centreline.
Decreases proportionally with respect to the angular displacement from the centreline.
35. What are the modulation frequencies of the two overlapping lobes that are used on an ILS approach?
63 MHz 123 MHz.
75 kHz 135 kHz.
328 MHz 335 MHz
90 Hz 150 Hz.
36. Regarding ILS which of the following in true?
The DME paried with the ILS channels are usually zero referenced next to the departure end of the runway.
The localiser part of the frequency band is shared with the DME.
All markers transmit at 75 MHz
The glide path transmitter is located 300m from the departure end of the runway.
37. The ILS inner marker (if available) modulation frequency is?
1300 Hz.
400 Hz.
3000 Hz.
240 Hz.
38. If you are flying a back course ILS, you are flying a?
Non precision approach on the precision approach runway.
Precision approach on the reciprocal runway of the precision approach runway.
Precision approach on the precision approach runway.
Non precision approach on the reciprocal runway of the precision approach runway.
39. The transmission of the glide slope beacon is characterised by?
UHF carrier frequency with a possible "voice ident".
VHF frequency modulated with a 90 Hz AM and 150 Hz AM navigation signal.
UHF frequency with a minimum range of 10 nm.
300 to 3000 Hz Amplitude Modulation fro the ATIS.
40. 108.35 MHz can only be?
A NDB frequency.
An ATC frequency.
A VOR frequency.
An ILS frequency.
41. Where, in relation to the runway, is the ILS localiser transmitting aerial normally situated?
On the non-approach end of the runway about 300 m from the runway on the extended centreline.
At the approach end of the runway about 300 m fro touchdown on the Centrelies.
At the non-approach end about 150 m to one side of the runway and 300 m along the extended centreline.
At the approach end about 150 m to out side the runway and 300 m from touchdown.
42. The basic principle of operation of the ILS is the difference in depth of modulation (DDM) between the 90 Hz and the 150 Hz lobes. A DDM of zero indicates: 1. The higher tone lobe is received at a higher strength than the lower the lobe. 2. The exact runway centreline. 3. Aircraft is on the glide path. 4. A balance between modulations
2, 3 and 4.
2 and 3.
1, 2 and 4.
1 and 3.
43. Locatory are?
Low powered ADFs use for airfield or runway approach.
High powered NDBs used for en route and airway navigation.
LF/MF NDBs used as an aid for the approach.
Beacons with a range of 10 to 250 nm.
44. What is the approximate angular coverage of reliable navigation information for a 3 degree glide path out to a minimum distance of 10 nm?
1.35 degrees above the horizontal to 5.25 degrees above the horizontal, and 8 degrees each side of the localiser centreline.
0.70 degrees above the glide path and 2.5 degrees each side of the localiser centreline.
3 degrees above the horizontal to 5.25 degrees above the horizontal, and 8 degrees each side of the localiser centreline.
0.45 degrees above the horizontal to 1.75 degrees above the glide path, and 8 degrees each side of the localiser centreline.
45. The type of modulation used for the ILS frequency carrier is?
Amplitude modulation.
Phase modulation.
Dual modulation.
Frequency modulation.
46. An aircraft carrying out a 3° glide ILS approach experiences a reduction i groudspeed from 150 kt at the outer marker to 120 kt over the threshold. The effect of this change in groundspeed on the aircraft's rate of descent will be a decrease of approximately
100 FT/MIN.
250 FT/MIN.
50 FT/MIN
150 FT/MIN.
47. An ILS marker beacon operates in the?
UHF band.
HF band.
LF/MF band.
VHF band.
48. The ILS marker with an aural frequency of 3000 Hz is the?
Centreline marker.
Middle marker.
Inner marker (if availale)
Outer marker.
49. Concerning the glide path principle of operating in an ILS, the needle of the aircraft indicator is centred when the difference in depth of modulation (DDM) is?
Null.
Maximum.
More than 150 Hz.
Less than 90 Hz.
50. According to ICAO Annex 10, in which frequency band(s) does the locator normally transmit?
HF
LF/MF.
MF/HF.
HF/VHF.
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