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RADIO NAV-RH-THEORY-CHAPTER6-MLS
1.
Which of the following is an advantage of MLS?
a) Can be used in inhospitable terrain
b) Uses the same aircraft equipment as ILS
c) Has a selective access ability
d) Is not affected by heavy precipitation
2.
The coverage of MLS is ___ either side of the centre line to a distance of ___
a) 40 deg ; 40 nm
b) 40 deg ; 20 nm
c) 20 deg ; 20 nm
d) 20 deg ; 40 nm
3.
Which answer correctly completes the following statement? The characteristics of an MLS installation are that it uses:
a) an azimuth transmitter at the approach end of the runway, an elevation transmitter at the upwind end of the runway and two frequencies
b) one transmitter for both elevation and azimuth and two frequencies
c) one transmitter for both elevation and azimuth and a single frequency
d) an elevation transmitter at the approach end of the runway, an azimuth transmitter at the upwind end of the runway and a single frequency
4.
Which one of the following is an advantage of a Microwave Landing System (MLS) compared with an Instrument Landing System (ILS)?
a) It does not require a separate azimuth (localiser) and elevation (azimuth) transmitter
b) It is insensitive to geographical site and can be installed at sites where it is not possible to use an ILS
c) The installation does not require to have a separate method (marker beacons or DME) to determine range
d) There is no restriction on the number of ground installations that can be operated because there is an unlimited number of frequency channels available
5.
In which frequency band does the Microwave Landing System (MLS) operate?
a) EHF
b) SHF
c) VHF
d) UHF
6.
The azimuth transmitter of a Microwave Landing System (MLS) provides a fan-shaped horizontal approach zone which is usually:
a) + or – 50o of the runway centre-line
b) + or – 40o of the runway centre-li
c) + or – 60o of the runway centre-line
d) + or – 30o of the runway centre-line
7.
Which one of the following methods is used by a Microwave Landing System (MLS) to indicate distance from the runway threshold?
a) Timing the interval between the reception of sequential secondary radar pulses from the MLS station to the aircraft
b) Timing the interval between the transmission and reception of primary radar pulses from the aircraft to MLS station
c) Measurement of the frequency shift between the MLS azimuth and elevation transmissions
d) A DME co-located with the MLS transmitters
8.
The principle of operation of MLS is:
a) time referenced scanning beams
b) phase comparison directional beams
c) lobe comparison of scanning beams
d) frequency comparison of reference beams
9.
Which one of the following correctly lists the major ground based components of a Microwave Landing System (MLS)?
a) Combined azimuth and elevation transmitter, outer and inner marker beacons
b) Separate azimuth and elevation transmitters, outer and middle marker beacons
c) Combined azimuth and elevation transmitter, DME facility
d) Separate azimuth and elevation transmitters, DME facility
10.
MLS installations notified for operation, unless otherwise stated, provide azimuth coverage of:
a) + or – 20o about the nominal courseline out to a range of 10 NM
b) + or – 20o about the nominal courseline out to a range of 20 NM
c) + or – 40o about the nominal courseline out to a range of 30 NM
d) + or – 40o about the nominal courseline out to a range of 20 N
11.
The MLS utilises a:
a) clock referenced scanning beam system
b) phase referenced scanning beam system
c) time referenced scanning beam system
d) magnetic referenced scanning beam system
12.
In a MLS the time that elapses between the passage of the TO scan and the FROM scan at the aircraft position is:
a) not related to the angular position of the aircraft
b) indirectly proportional to the angular position of the aircraft
c) directly proportional to the angular position of the aircraft
d) none of the above are correct
13.
Microwave Landing Systems use guidance signals formed from:
a) time referenced scanning beams
b) radar beams
c) intersecting modulated signals transmitted on very narrow beams
d) phase differences between an amplitude modulated reference signal and a frequency modulated variable signal
14.
A microwave landing system operates:
a) on one of 200 channels in the band 5030 to 5090 GHz
b) on one of 200 channels in the band 5.03 GHz to 5090 GHz
c) on one of 400 channels in the band 5030 GHz to 5090 GHz
d) on one of 400 channels in the band 5.03 GHz to 5.09 GHz
15.
The scanning beam of the MLS system is called:
a) frequency reference scanning beam (FRSB)
b) phase reference scanning beam (PRSB)
c) time reference scanning beam (TRSB)
d) angle reference scanning beam (ARSB)
16.
In an MLS system, the azimuth coverage is:
a) +/- 10o
b) +/- 8o
c) +/- 35o
d) +/- 40
17.
Distance on MLS is measured by:
a) measuring the time taken for the primary radar pulse to travel from the MLS transmitter to the aircraft receiver
b) measuring the time taken for the secondary radar pulse to travel from the MLS transmitter to the aircraft receiver
c) phase comparison between the azimuth and elevation beams
d) co-located DME
18.
The frequency band of MLS is:
a) UHF
b) VHF
c) SHF
d) VLF
19.
MLS consists of:
a) a common azimuth and elevation transmitter
b) overlapping centre-line lobe transmission in azimuth angled to provide glide slope information
c) an azimuth transmitter and an elevation transmitter on separate frequencies and a DME
d) an azimuth transmitter and an elevation transmitter operating on a shared frequency and a DME
20.
Microwave Landing Systems allow the aircraft to fix its position accurately in three dimensions by means of:
a) timing the interval between pulses in azimuth and elevation and timing the delay for pulses to reach the aircraft to define range
b) information from four satellites transmitting microwaves
c) timing the passage of two scanning beams integrated with DME
d) directional aerials and DME
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