Radio Navigation - Level 4, Questions with accurate answers. rated A

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Radio Navigation - Level 4 The purpose of mode S is: - ✔✔for data linking, ATC surveillance and reduced R/T communications and use by TCAS II. If a radar beam, at a frequency of 10.000 MHz, is ... radiated from a parabolic dish of diameter 15 cm, the azimuth target discrimination angle is: - ✔✔14° In a primary radar system: - ✔✔all radio frequency energy is produced by the radar located at the radar site. A pilot wishes to obtain the magnetic bearing of his aircraft from a VDF station. Which of the following terms would he use: - ✔✔QDR A frequency of 295 KHz would be described as: - ✔✔LF. In order to have good sensitivity to water droplets in cumuli type clouds, the wavelength of an AWR should be: - ✔✔approximately 3 cm. When a maximum range and altitude is published for a VOR? - ✔✔The reception from this VOR is guaranteed free from harmful interference from other VORs when you are within this airspace. An SRA may be flown to: - ✔✔2.0 nm using QFE unless the pilot advises the controller the approach is to be flown on QNH. A ground radar transmitting at a PRF of 1200 pulses/second will have a maximum unambiguous range of approximately: - ✔✔67 NM. For a 3° ILS glidepath the approximate angles of lower and upper vertical coverage are: - ✔✔1.35° - 5.25° . Assuming sufficient transmission power, the maximum range of a ground radar with a pulse repetition frequency of 450 pulses per second is: (Given: velocity of light is 300 000 km/second) - ✔✔333 km. In an AWR with a 5 deg beamwidth, how do you orientate the scanner to receive returns from clouds at or above your level? - ✔✔2.5 deg uptilt An aircraft is flying a constant heading with 8° right drift and is making good a track parallel to the centre line of an airway but 5 nm off to the left of the centreline. The ADF reading of a NDB on the airway centreline 42 nm ahead of the aircraft is: - ✔✔015° Relative.When using the ILS, a false glidepath is: - ✔✔always found above the real glidepath. When data are published for an hyperbolic navigation system, they are valid: - ✔✔for users at sea level. What is the range of long range ground radar? - ✔✔300nm The sky search carried out by a GNSS receiver: - ✔✔is done when the receiver position is in error. The SHF band has been selected for Airfield Surface Movement Indicator (ASMI) radars in preference to the EHF band because: - ✔✔the attenuation caused by precipitation is greater in the EHF band and reduces the radars effective range and usefulness. What are the primary navigation inputs used by RNAV system? - ✔✔Nav Aids, INS, FMC database. The ICAO designation for VOR is: - ✔✔A9W When considering the propagation of ADF transmissions night effect is most pronounced: - ✔✔at dusk and dawn. Using a 5 dot CDI, how many dots would show for an aircraft on the edge of an airway at 100 nm from the VOR beacon? - ✔✔1.5 In an amplitude modulated signal, the amplitude of the carrier wave will: - ✔✔vary according to the amplitude of the modulating signal. Scalloping of an ILS beam means: - ✔✔That the guidance beam direction varies from side to side of the intended approach path. A DME that has difficulty obtaining a lock-on: (NOTE: PRF = pulse recurrence frequency, PPS = pulses per second) - ✔✔stays in search mode but reduces PRF to max. 60 PPS after 15000 pulse pairs have been transmitted. The promulgated range for an NDB is applicable: - ✔✔during daytime only. For any given circumstances, in order to double the effective range of a primary radar the power output must be increased by a factor of: - ✔✔4 A satellite navigation system requires information from ... satellites to give a three dimensional fix without considering RAIM. - ✔✔4An aircraft will not accept replies from its own transmissions that are reflected from the ground because the: - ✔✔interrogation and reply frequencies are 63 Mhz apart. What is Back Up FMS navigation mode? - ✔✔When the FMC is suffering from some failure but there is still limited FMS function. An aircraft is required to approach a VOR station via the 244° radial. In order to obtain correct sense indications the deviation indicator should be set to: - ✔✔064° with the TO flag showing. Signal reception is required from a minimum number of satellites that have adequate elevation and suitable geometry in order for a Satellite-Assisted Navigation System (GNSS/GPS) to carry out independent three dimensional operation, Receiver Autonomous Integrity Monitoring (RAIM) and to isolate any faulty satellite and remove it from contributing to the navigation solution. The number of satellites is: - ✔✔6 An aircraft heading 130° (M) has an ADF reading of 190° Relative is to intercept the 170° (M) track outbound from an NDB at 30° . The relative bearing of the NDB that confirms track interception is: - ✔✔140° Relative. The external reference used by the B737-400 FMC is: - ✔✔DME/DME. The accuracy required of a basic RNAV system is: - ✔✔+/-5 nm. What is the maximum theoretical range, in nm, of a radar whose PRF is 750 pps? - ✔✔108 NM. The time required for a GNSS receiver to download the satellite almanac for the: NAVSTAR/GPS is: - ✔✔12.5 minutes. Which one of the following lists information given by a basic VOR/DME-based Area Navigation System? - ✔✔Cross track distance; along track distance; angular course deviation. The GPS satellite navigation system suffers from the following errors: - ✔✔Ephemeris, clock bias, propagation. The DME (Distance Measuring Equipment) operates within the following frequencies: - ✔✔962 to 1213 MHz A Class A magnetic bearing from a VDF station will be a ... with an accuracy of ... - ✔✔QDR; ± 2° .An aircraft AWR in the iso-echo or contour mode is used for: - ✔✔identifying areas of maximum turbulence within a cloud. How many operational satellites are required for Full Operational Capability (FOC) of the satellite navigation system NAVSTAR/GPS? - ✔✔24 An AWR is being used to map the ground between 50nm and 70nm in front of the aircraft. Which would be the correct beam to use and on what scale? - ✔✔Cosecant beam, 150nm. What is the wavelength of an NDB transmitting on 375 kHz? - ✔✔800 m A signal with a wavelength of 7360 m lies in the: - ✔✔LF band. An aircraft heading 137(M) has a small island showing on the AWR at 45nm range on the 30 left azimuth line. Local variation is 12° W. To obtain a fix from this information you should plot: - ✔✔Range 45 nm and QTE 275 from the centre of the island. In a Satellite-Assisted Navigation system (GNSS/GPS) a position line is obtained by: - ✔✔timing the period that is taken for a satellites transmission to reach the aircrafts receiver. An aircraft on a heading of 270° (M) has 093 set on the OBS and TO indicated on the VOR L/R deviation indicator. The needle shows two dots fly left. The aircraft is on the: - ✔✔269° radial F bearings by an aeroplane by day within the published protection range should be accurate to within a maximum error of: - ✔✔+/-5° When ADF equipment which incorporates a sense aerial and a loop aerial is tuned to a NDB and the loop aerial is rotated so that a sharp null is found the aerial is: - ✔✔in line with the incoming signals. The basic principle of operation of a standard VOR is by: - ✔✔phase difference between a frequency modulated reference signal and an amplitude modulated variable signal. The maximum unambiguous (theoretical) range for a PRF of 1200 pps is: - ✔✔67 nm. A VHF signal is transmitted from an aircraft at FL 230. It will be received by an aircraft at FL 50 when the aircraft are ... nm apart. - ✔✔278 A DME in tracking mode subsequently experiences a reduction in signal strength will switch the equipment in the first instance to: - ✔✔memory mode.An aircraft over the sea is receiving a signal from an NDB 50nm from the coast and another from an NDB 20nm from the coast. Which of the following statements is most correct? - ✔✔The bearing information from the beacon 20nm inland would be most correct. A typical frequency employed in Distance Measuring Equipment (DME) is: - ✔✔1000 MHz During maintenance, malfunction or testing the identification signal of a VOR transmitter is (i) by (ii) or (iii). - ✔✔(i) suppressed; (ii) a continuous tone; (iii) removed The nominal maximum range of an NDB with a transmitter power is 200 watts is: - ✔✔50 to 60 nm. The most accurate position information will be derived from: - ✔✔twin DME fixing. The rate of attenuation of a radio wave which occurs when the wave travels close to the Earths surface. - ✔✔increases as the frequency of the wave increases, and is greater over the land than the sea. If the reference phase differs 30° with the variable phase the radial from the VOR station will be: - ✔✔030° In order to obtain an ADF bearing the: - ✔✔signal must be received by both the sense and loop aerials. The prime factor in determining the maximum unambiguous range of a primary radar is the: - ✔✔pulse recurrence rate. Which of the following will give the most accurate calculation of aircraft ground speed? - ✔✔A DME station sited on the flight route. The rate of refraction of a radio wave which occurs within the ionosphere: - ✔✔decreases as the frequency of the radio wave increases. The aircraft DME receiver cannot lock on to interrogation signals reflected from the ground because: - ✔✔aircraft transmitter and DME ground station are transmitting on different frequencies. An NDB signal crossing from land to sea will ... speed and bend ... the normal. - ✔✔increase, away from. What are the basic elements transmitted by NAVSTAR/GPS satellites?i. offset of the satellite clock from GMT ii. ephemeris data iii. health data iv. ionospheric delays v. solar activity - ✔✔i, ii, iv What is QTE? - ✔✔True track from station. When a mode C interrogation is responded to, vertical position of the aircraft is coded and transmitted. This vertical position is referred to: - ✔✔1013.2 hPa The colours used on a conventional AWR to indicate increasing intensity of returns are: - ✔✔green, amber and red. AWR in the contour mode is used for: - ✔✔identifying areas of maximum turbulence within a cloud. DME channels utilise frequencies of approximately: - ✔✔1000 MHz Loran is available for use: - ✔✔north America, North Atlantic, parts of Europe and the Mediterranean. The DME in an aircraft, cruising at FL210, fails to achieve lock on a DME at msl at a range of 210 nm. The reason for this is: - ✔✔the aircraft is beyond line of sight range. Which one of the following is an advantage of a Microwave Landing System (MLS) compared with an Instrument Landing System (ILS)? - ✔✔It is insensitive to geographical site and can be installed at sites where it is not possible to use an ILS. An aircraft is on radial 120 with a magnetic heading of 300° , the track selector (OBS) reads: 330. The indications on the Course Deviation Indicator (CDI) are fly: - ✔✔left with TO showing. The visibility of GPS satellites is: - ✔✔dependent on the location of the user. While correctly tuned to an NDB transmitting a N0N A1A signal the BFO is switched on. What would you hear: - ✔✔both the identification and the tone. The JAR25 colour code for ILS deviation pointer is: - ✔✔magenta. A VOR/DME share the same first two letters of their respective identifiers; the last identifying letter of the DME is a Z. This means that: - ✔✔they are more than 600m apart but serve the same location.ICAO specifications are that range errors indicated by Distance Measuring Equipment (DME) should not exceed: - ✔✔+ or - 0.25 NM plus 1.25% of the distance measured. The selection of code 7700 on an aircraft SSR transponder indicates: - ✔✔an emergency. In a primary radar using pulse technique, the ability to discriminate between targets in azimuth is a factor of: - ✔✔beam width. A Loran C chain is designated according to: - ✔✔a Group Repetition Interval. An RMI shows the bearing of an NDB as 020° . The h [Show More]

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