Un compte Premium offert sur le site FCL.055 ! Rendez-vous sur www.fcl055-exam.fr puis créez un compte avec le même email que celui...   [Lire la suite]


The main factor which determines the minimum range that can be measured by a ? [ Answer reports ]

Question 191-1 : Length amplitude repetition rate frequency

Admin .pulse length defines the minimum theoretical range of a radar exemple 291 Length.Length.

Complete the following statement .aircraft surface movement radar operates on ?

Question 191-2 : I shf ii 60 iii sometimes i ehf ii 30 iii never i shf ii 10 iii always i ehf ii 100 iii never

exemple 295 (i) shf (ii) 60 (iii) sometimes.(i) shf (ii) 60 (iii) sometimes.

The maximum pulse repetition frequency prf that can be used by a primary radar ?

Question 191-3 : 1620 pps 3240 pps 610 pps 713 pps

Admin .range = c / 2f.f pps = c velocity of light / 2 x range.range= 50 nm.f = 162000 nm/s / 2 x 50.f = 1620 pulses per second exemple 299 1620 pps.1620 pps.

Ignoring pulse length and fly back a radar facility designed to have a maximum ?

Question 191-4 : 3000 6000 167 330

Admin .maximum range = velocity of light x 1/ prf.50 km = 300000 x 1/prf.prf = 300000 / 50 = 6000.but we have to ignore pulse length and fly back so 6000/2 exemple 303 3000.3000.

Which combination of characteristics gives best screen picture in a primary ?

Question 191-5 : Short pulse length and narrow beam long pulse length and wide beam long pulse length and narrow beam short pulse length and wide beam

exemple 307 Short pulse length and narrow beam.Short pulse length and narrow beam.

The minimum range of a primary radar using the pulse technique is determined by ?

Question 191-6 : I pulse length ii pulse recurrence frequency i transmission frequency ii transmitter power output i pulse length ii length of the timebase i transmission frequency ii pulse recurrence frequency

exemple 311 (i) pulse length (ii) pulse recurrence frequency.(i) pulse length (ii) pulse recurrence frequency.

The maximum range of primary radar depends on ?

Question 191-7 : Pulse recurrence frequency wave length frequency pulse length

Admin .primary radar provides bearing and distance of targets .primary ground radar is used to detect aircraft that are not equipped with a secondary radar transponder .the maximum theoretical unambiguous range if the prf is given using the formula .range in km = 300000/ prf x 2 . prf pulse repetition frequency .take care pulse length defines the minimum theoretical range of a radar exemple 315 Pulse recurrence frequency.Pulse recurrence frequency.

A frequency of airborne weather radar is ?

Question 191-8 : 9375 mhz 9375 ghz 9375 khz 93 75 mhz

Admin .the wavelength is approximately 3 cm and frequency of most airborne weather radar awr is approximately 9 ghz exemple 319 9375 mhz.9375 mhz.

Under easa cs 25 colour code rules for electronic flight instrument systems ?

Question 191-9 : Green amber/yellow red magenta green red magenta black black amber/yellow magenta red amber/yellow magenta black

Admin . 2616 exemple 323 Green, amber/yellow, red, magenta.Green, amber/yellow, red, magenta.

For any given circumstances in order to double the effective range of a primary ?

Question 191-10 : 16 2 4 8

Admin .to increase the range of a radio transmission the power is increased by a square factor to double its range the power is increased by a 4 factor x2² .but for a primary radar signal must return to the ground station in order for the radar to work .power output must be increased by a factor of 2²x 2² = 16 exemple 327 16.16.

A weather radar set to the 100 nm scale shows a squall at 50 nm by changing the ?

Question 191-11 : Increase in area and move to the top of the screen increase in area and appear nearer to the bottom of the screen decrease in area but not change in position on the screen decrease in area and move to the top of the screen

Admin . 2617.by changing the scale to 50 nm the squall line increases in area and moves to the top of the screen exemple 331 Increase in area and move to the top of the screen.Increase in area and move to the top of the screen.

The code transmitted by a ssr transponder consists of ?

Question 191-12 : Pulses phase differences frequency differences amplitude differences

exemple 335 Pulses.Pulses.

In which frequency band do most airborne weather radars operate ?

Question 191-13 : Shf uhf ehf vhf

Admin .vor operating frequencies vhf.localiser vhf.marker beacon vhf.dme operating frequencies uhf.glide slope uhf.gnss/gps uhf.l1 and l2 frequencies used by navstar/gps uhf.ils localiser and glide slope vhf and uhf bands .microwave landing system mls shf.airborne weather radars shf.locator lf/mf exemple 339 Shf.Shf.

The maximum range of an en route radar is approximately ?

Question 191-14 : 200 300 nm 100 200 nm 50 100 nm 300 400 nm

Admin .an aircraft at flight level 410 41000 ft can be seen by a long range radar located at mean sea level at .1 23*sqrt41000 = 250 nm. sqrt square root exemple 343 200-300 nm.200-300 nm.

In airborne weather radar awr the main factors which determine whether a cloud ?

Question 191-15 : Size of the water drops wavelength/frequency used range from cloud wavelength/frequency used size of the water drops diameter of radar scanner rotational speed of radar scanner range from cloud

Admin . 2618 exemple 347 Size of the water drops; wavelength/frequency used.Size of the water drops; wavelength/frequency used.

In order to ascertain whether a cloud return on an aircraft weather radar awr ?

Question 191-16 : 2 5° up 5° up 0° 2 5° down

Admin .an aircraft weather radar awr is typically located in the nosecone of the aircraft behind a radome that is composed of non reflective material .incorporated in the cockpit equipment is a tilt feature either automatic or manual which enables the crew to raise or lower the sweep above and below the longitudinal axis of the aircraft .when assessing the intensity of a thunderstorm the tilt should be adjusted to the middle and lower portions of the system where the density of precipitation provides the most accurate indications of size and intensity . 2619 exemple 351 2.5° up.2.5° up.

In relation to radar systems that use pulse technology the term 'pulse ?

Question 191-17 : Number of pulses per second delay after which the process re starts the number of cycles per second ratio of pulse period to pulse width

exemple 355 Number of pulses per second.Number of pulses per second.

What is the maximum number of usable secondary surveillance radar ssr ?

Question 191-18 : 4096 3600 1000 760

Admin .squawk codes are four digit octal numbers the dials on a transponder read from 0 to 7 inclusive .thus the lowest possible squawk is 0000 and the highest is 7777 four octal digits can represent up to 4096 different codes exemple 359 4096.4096.

Which of the following equipments uses primary radar principles ?

Question 191-19 : Airborne weather radar awr secondary surveillance radar ssr distance measuring equipment dme global positioning system gps

Admin .radar is a distance measuring system using the principle of radio echoing the term radar is an acronym for radio detecting and ranging it is a method for locating targets by using radio waves the transmitter generates microwave energy in the form of pulses these pulses are then transferred to the antenna where they are focused into a beam by the antenna the radar beam is much like the beam of a flashlight the energy is focused and radiated by the antenna in such a way that it is most intense in the center of the beam with decreasing intensity near the edge the same antenna is used for both transmitting and receiving when a pulse intercepts a target the energy is reflected as an echo or return signal back to the antenna from the antenna the returned signal is transferred to the receiver and processing circuits located in the receiver transmitter unit the echoes or returned signals are displayed on an indicator .this is the same principle uses for an airborne weather radar exemple 363 Airborne weather radar (awr).Airborne weather radar (awr).

Which of the following equipments works on the interrogator/transponder ?

Question 191-20 : Secondary surveillance radar ssr global positioning system gps airborne weather radar awr aerodrome surface movement radar

exemple 367 Secondary surveillance radar (ssr).Secondary surveillance radar (ssr).

In order to indicate an emergency situation the aircraft secondary surveillance ?

Question 191-21 : 7700 7600 7500 7000

Admin .7600 radio communication failure .7500 unlawful interference with the planned operation of the flight .7700 emergency situation exemple 371 7700.7700.

The theoretical maximum range for an airborne weather radar is determined by the ?

Question 191-22 : Pulse recurrence frequency beamwidth pulse length carrier wave frequency

exemple 375 Pulse recurrence frequency.Pulse recurrence frequency.

The selection of code 7500 on an aircraft ssr transponder indicates ?

Question 191-23 : Unlawful interference with the planned operation of the flight an emergency transponder malfunction radio communication failure

Admin .7500 unlawful interference with the planned operation of the flight .7600 radio communication failure .7700 emergency situation exemple 379 Unlawful interference with the planned operation of the flight.Unlawful interference with the planned operation of the flight.

The selection of code 7700 on an aircraft ssr transponder indicates ?

Question 191-24 : An emergency radio communication failure transponder malfunction unlawful interference with the planned operation of the flight

Admin .7700 emergency situation .7600 radio communication failure .7500 unlawful interference with the planned operation of the flight exemple 383 An emergency.An emergency.

In a primary radar using pulse technique pulse length determines ?

Question 191-25 : Minimum measurable range target discrimination maximum measurable range beam width

Admin .pulse length defines the minimum theoretical range of a radar .pulse repetition frequency prf gives the maximum theoretical unambiguous range of the radar .range in km = 300000/ prf x2 .if you search for the prf .prf = 300000 / range in km x 2 exemple 387 Minimum measurable range.Minimum measurable range.

In a primary radar using pulse technique pulse recurrence frequency determines ?

Question 191-26 : Maximum theoretical range target discrimination minimum range beam width

Admin .pulse length defines the minimum theoretical range of a radar .pulse repetition frequency prf gives the maximum theoretical unambiguous range of the radar . maximum theoretical range = velocity of light / 2 x pulse repetition frequency exemple 391 Maximum theoretical range.Maximum theoretical range.

Which of the following radar equipments operate by means of the pulse technique ?

Question 191-27 : 1 2 3 and 4 1 2 and 4 2 3 and 4 2 and 4

Admin .pulse technique .radar involves the transmission of pulses of electromagnetic waves by means of a directional antenna some of the pulses are reflected by objects that intercept them the reflections are picked up by a receiver processed electronically and converted into visible form by means of a cathode ray tube the range of the object is determined by measuring the time it takes for the radar signal to reach the object and return the object's location with respect to the radar unit is determined from the direction in which the pulse was received in most radar units the beam of pulses is continuously rotated at a constant speed or it is scanned swung back and forth over a sector also at a constant rate the velocity of the object is measured by applying the doppler principle if the object is approaching the radar unit the frequency of the returned signal is greater than the frequency of the transmitted signal if the object is receding from the radar unit the returned frequency is less and if the object is not moving relative to the radar unit the return signal will have the same frequency as the transmitted signal .aerodrome surface movement radar airborne weather radar secondary surveillance radar ssr and aerodrome surveillance approach radar operate by means of the pulse technique exemple 395 1, 2, 3 and 4.1, 2, 3 and 4.

On which of the following radar displays is it possible to get an indication of ?

Question 191-28 : Aerodrome surface movement radar asmr secondary surveillance radar ssr aerodrome surveillance approach radar airborne weather radar awr

.surface movement radar smr systems are used by air traffic controllers to detect and guide aircraft and vehicles i e baggage carriers buses supply trucks staff cars etc on the ground surface of the airport and thus secure safety it is the most widely used surveillance system for airport surveillance at present .it is sometimes possible to identify aircraft types from the return exemple 399 Aerodrome surface movement radar (asmr).Aerodrome surface movement radar (asmr).

Which of the following lists the phenomena least likely to be detected by radar ?

Question 191-29 : Clear air turbulence precipitation turbulence in cloud that has precipitation wet snow and turbulence in cloud that has precipitation

.the weather radar only detects precipitation droplets .how much it detects depends upon the size composition and number of droplets water particles are five times more reflective than ice particles of the same size .the radar does detect . rainfall. wet hail and wet turbulence. ice crystals dry hail and dry snow however these three elements give small reflections .the radar does not detect . clouds fog or wind droplets are too small or no precipitation at all . clear air turbulence no precipitation exemple 403 Clear air turbulence.Clear air turbulence.

Which one of the following is an advantage of a secondary radar system when ?

Question 191-30 : The required power of transmission from the ground equipment is reduced the relatively small ground antenna transmits no side lobes thus eliminating the danger of false replies from the airborne transponder possibility of obtaining speed information for aircraft within range is not limited to line of sight

Admin .secondary surveillance radar emits an interrogation pulse rather than a beam of energy you get back a response from the transponder rather than reflected energy .calculating the time to response and return plus where the aerial was pointing during the process gives you the return on the display .thus the required power of transmission from the ground equipment is reduced exemple 407 The required power of transmission from the ground equipment is reduced.The required power of transmission from the ground equipment is reduced.

What information may be displayed on an atc radar screen connected only to a ?

Question 191-31 : Aircraft position only aircraft position and ssr code aircraft position ssr code and altitude aircraft altitude

exemple 411 Aircraft position only.Aircraft position only.

In an airborne weather radar the areas of greatest turbulence are usually ?

Question 191-32 : Colour zones of red and magenta blank areas where there is no colour colour zones of green and yellow areas which are coloured black

Img2616 exemple 415 Colour zones of red and magenta.Colour zones of red and magenta.

Airborne weather radars are generally based on the use of ?

Question 191-33 : Primary radar in the shf band primary radar in the uhf band secondary radar in the shf band secondary radar in the vhf band

exemple 419 Primary radar in the shf band.Primary radar in the shf band.

Mode a or c garbling may occur to ?

Question 191-34 : Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1 7 nm two or more aircraft in the same direction from the ground station at the same altitude with a difference in slant range of more than 1 7 nm two or more aircraft different directions from the ground station at the same altitude with a difference in slant range of more than 1 7 nm two or more aircraft different directions from the interrogator at the same altitude with a difference in slant range of less than 1 7 nm

Admin .disadvantages of ssr mode a/c . code garbling of aircraft less than 1 7 nm apart measured in the vertical plane perpendicular to and from the antenna . 'fruiting' which results from reception of replies caused by interrogations from other radar stations exemple 423 Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1.7 nm.Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1.7 nm.

In a primary pulse radar you have ?

Question 191-35 : A directional aerial for both transmission and reception a directional aerial for transmission and an omni directional aerial for reception a directional aerial for transmission and another one for reception an omni directional aerial for transmission and directional aerial for reception

exemple 427 A directional aerial for both transmission and reception.A directional aerial for both transmission and reception.

A tcas ii equipped a/c will have mode s because ?

Question 191-36 : The datalink is required to co ordinate evasive manoeuvres the data link is required to transmit relative position mode s transmits a 3d position true altitude is obtained from mode s

Mode s selective is designed to allow automatic collision avoidance .sense of ras coordinated between tcas equipped aircraft resolution advisories so tcas ii traffic alert and collision avoidance system automatically implies mode s transponder .the ra intensity is checked and revised if necessary every second ..more information can be found by using the link below exemple 431 The datalink is required to co-ordinate evasive manoeuvres.The datalink is required to co-ordinate evasive manoeuvres.

How does a mode s interrogator identify aircraft ?

Question 191-37 : A 24 bit identifier giving over 16 million combinations the p3 pulse an eight bit identifier which gives 212 unique combinations the four letter selcal code

Admin .the provision of air traffic services ats using ssr mode s initially in a central area of european airspace will rely on a unique icao 24 bit aircraft address for selective interrogation of individual aircraft the 24 bit aircraft address is also an essential element of the airborne collision avoidance system acas ii in addition mode s surveillance requires the reporting of aircraft identification as stated in circular aic a 01/04 concerning mode s airborne equipment requirements.the aircraft address shall be one of 16 777 214 twenty four bit aircraft addresses allocated by icao to the state of registry or common mark registering authority and assigned as prescribed in the appendix to chapter 9 part i volume iii icao annex 10 .all mode s equipped aircraft engaged in international civil aviation are required to have an aircraft identification feature as prescribed in icao annex 10 volume iv chapter 2 2 1 5 2 exemple 435 A 24 bit identifier, giving over 16 million combinations.A 24 bit identifier, giving over 16 million combinations.

Which statement with respect to interrogation modes is correct ?

Question 191-38 : Mode s broadcast will transmit information to all mode s transponders mode s only all call will trigger transponder replies of all mode a/c/s transponders mode s selective will trigger replies of all mode s transponders mode a/c transponders are suppressed intermode a/c/s all call and intermode a/c only all call differ in the pulse spacing used between the p1 and p3 pulse

Admin .mode s is a secondary surveillance radar technique that permits selective interrogation of aircraft by means of a unique 24 bit aircraft address thus avoiding the risk of confusion or mis identification due to overlapping signals mode s has been standardised by icao for many years it employs ground based interrogators and airborne transponders and operates in the same radio frequencies 1030/1090 mhz as conventional ssr systems with which it is backwards compatible .mode s ground interrogators transmit a mode s all call at a steady rate similar to a conventional ssr . any mode s transponder that is not 'locked out' will reply to the interrogation transmitting its 24 bit aircraft address registration and its aircraft identification call sign exemple 439 Mode s broadcast will transmit information to all mode s transponders.Mode s broadcast will transmit information to all mode s transponders.

To improve the detection of precipitation area s in e g thunderstorms in which ?

Question 191-39 : The tilt setting should be lower when the aircraft climbs to a higher altitude the tilt setting should be higher when the aircraft climbs to a higher altitude the tilt setting should be higher when the selected range decreases the tilt setting should be lower when the selected range increases

Admin . 2620.if the top of the cloud lies at or slightly above the level of flight and you decide to climb it will be better to tilt down your weather radar to maintain a good awareness of the situation .if not you will not be able to see precipitations the risk is to see clear sky above the clouds and thus you will not be able to avoid large area of turbulences exemple 443 The tilt setting should be lower when the aircraft climbs to a higher altitude.The tilt setting should be lower when the aircraft climbs to a higher altitude.

Garbling is caused by ?

Question 191-40 : Aeroplanes in close proximity responding to the same interrogation aeroplanes at range responding to interrogations from another atc ssr doppler effect on targets moving radially towards or away from the ssr an aeroplanes transponder responding to side lobes or reflections of the interrogation signal

exemple 447 Aeroplanes in close proximity responding to the same interrogation.Aeroplanes in close proximity responding to the same interrogation.

~

Exclusive rights reserved. Reproduction prohibited under penalty of prosecution.

7599 Free Training Exam