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CPL Test Series
Question Bank
Questions for SSR
Answer the following questions
Test Mode
Training Mode
1. Which statement regarding Mode S transponders is most correct?
Mode S transponders are used with TCAS II.
Mode S transponders are used to assist GPS positioning.
Mode S and mode C transponders operate on different frequencies.
Mode S transponders reduce R/t traffic and provide a datalink facility.
2. The SSR transceiver interrogates on ..... and receives on ....?
1030 MHz 1090 MHz.
1090 MHz 1090 MHz.
1090 MHz 1030 MHz.
1030 MHz 1030 MHz.
3. "Fruiting" is caused by?
Doppler effect on targets moving radially towards or away from the SSR.
Aeroplanes in code proximity responding to the same interrogator.
Aeroplanes at range responding to interrogations from another ATC SSR units.
An aeroplane's transponder responding to side lobes or reflection of the interrogation signal.
4. What informattion may be displayed on an ATC radar screen connected only to a primary radar system?
Aircraft positions only.
Aircraft positions and SSR code.
Aircraft altitude.
Aircraft position, SSR code and altitude.
5. In SSR, the interrogations use different modes. If altitude reporting is required, the aeroplane's transponder should be set to "ALT" and will respond to?
Mode A interrogations only.
Mode C and Ident Interrogations.
Mode A and C interrogations.
Mode C interrogations only.
6. How does a mode S interrogator identify aircraft?
The P3 pulse.
An eight bit identifier, which gives 212 unique combinations.
The four letter SELCAL code.
A 24 bit identifier, giving over 16 million combinations.
7. The spacing between two pulses transmitted by an SSR interrogator decides?
What service may be provided by the SSR.
The identification of the SSR.
The ATC code to be sent to the aircraft.
What mode is used.
8. Garbling is caused by?
An aeroplane's transponder responding to side lobes or reflections of the interrogation signal.
Doppler effect on targets moving radially towards or away from the SSR.
Aeroplanes in close proximity responding to the same interrogator.
Aeroplanes at range responding to interrogations from another ATC SSR units.
9. In order to indicate radio failure the aircraft SSR transponder should be selected to code
7700
7500
7000
7600
10. SSR in ATC use?
Replaces primary radar.
Suffers from greater attenuation than primary radar, due to the higher frequencies used.
Uses primary radar techniques.
Is complementary to primary radar.
11. With normal SSR Mode A coding the aircraft replies by sending back a train of 12 pulses contained between 2 framing pulses with?
Up to 4096 codes in 4 boxes.
Up to 4096 codes in 12 boxes.
Up to 4096 codes in 8 boxes.
Up to 2048 codes in 4 boxes.
12. A mode S transponder will?
Not respond to modes A or C because it is on a different frequency.
Respond to mode A interrogations but not to mode C.
Respond normally to mode A or C interrogations.
Not respond to interrogations on mode A.
13. A radar which empolys an interrogator/transponder technique is?
Doppler radar.
Continuous wave radar.
Secondary radar.
Primary radar.
14. The vertical position provided by SSR Mode C is referenced to?
WGS 84 Datum.
QNH unless QFE is in use.
1013.2 hPa.
QNH
15. The accuracy of SSR height as displayed to the air traffic controller is
+/- 25 feet.
+/- 50 feet.
+/- 100 feet.
+/- 75 feet.
16. When aircraft is operating its Secondary Surveillance Radar in mode C an air traffic controller's presentation gives information regarding the aircraft's indicated flight level that is accurate to within
+ or - 100 FT.
+ or - 50 FT
+ or - 75 FT.
+ or - 25 FT.
17. What are the frequencies used for interrogation and response for SSR?
1030 MHz for interrogation from the ground, 1090 MHz for response from aircraft.
1090 MHz for interrogation from the ground, 1030 MHz for response from aircraft.
1090 MHz for interrogation from the ground, 1090 MHz for response from aircraft.
1030 MHz for interrogation from the ground, 1030 MHz for response from aircraft.
18. When a Mode C check is carried out, and assuming the equipment is working without error, the Mode C will report a pressure altitude of 35,064 feet as ?
FL35064.
FL350.
FL3506.
FL351.
19. Consider the following statements on SSR Mode S?
A mode S interrogator, when installed, will also collect data from old Mode A and C transponders.
Mode S will have the ability to transmit short messages from the ground to a particular aircraft.
All of the statements are correct.
Mode S will be able to address any particular one of some 16 million aircraft.
20. What most affects the range available from secondary surveillance radar?
The height of the aircraft and the height of the ground interrogator.
The RRP.
The transmission power of the ground interrogator.
The transmission power of the aircraft interrogator.
21. In teh SSR response, the operation of the transponder ident button?
Sends out a special pulse before the normal pulse train.
Sends out a special pulse after the normal pulse train.
Sends out a special pulse in the X position in the pulse train.
Transmits the aeroplane's registration or flight number as a data sequence.
22. Selection of Mode C on the SSR provides ATC with information based on?
Aircraft height above QFE.
Aircraft altitude as indicated on the captain's altimeter.
Aircraft pressure altitude.
Aircraft height above the surface.
23. When the ATC transponder "IDENT" button is pressed by the pilot?
Mode A will automatically be selected.
The aeroplane's echo on the controller's display will flash or "fill in".
The controller will be urged to identify the aeroplane.
The aeroplane's identification will be sent to all SSR within range.
24. The SSR code for a total radio failure is?
7500
7600 plus mode C.
7500 plus mode C.
7600
25. The transponder code set in an SSR system consist of?
4 digits, forming any of 9999 different codes.
2 digits and 2 letters, forming any 4096 different codes.
4 digits, forming any of 7777 different codes.
4 digits, forming any of 4096 different codes.
26. When Mode C is selected on the aircraft SSR transponder the additional information transmitted is
Aircraft height based on sub-scale setting.
Flight level based on 1013.25 hPa.
Height based on QFE.
Altitude based on regional QNH.
27. On a typical computer generated SSR display the following data on a particular flight will be shown?
Squawk code, flight level, ground speed, aeroplane callsign.
Squawk code, magnetic heading, ground speed, aeroplane callsign.
Squawk code, flight level, true heading, aeroplane callsign.
Destination, flight level, ground speed, aeroplane callsign.
28. The SSR conspicuity code is ?
2000
760
7000
0033
29. A TCAS II equipped aircraft will have mode S because?
A TCAS II equipped aircraft will have mode S because?
Mode S transmits a 3D position.
The datalink is required to co-ordinate evasive manoeuvres.
True altitude is obtained from mode S.
30. Which one of the following switch position should be used when selecting a code on the Transponder?
STBY(Standby)
NORMAL
IDENT (Identification)
OFF
31. What SSR modes are frequently used by ATC
Mode A and mode B.
Mode C and mode D.
Mode A and mode C.
Mode A, mode B and mode C.
32. The selection of code 7600 on an aircraft SSR transponder indicates
Unlawful interference with the planned operation of the flight
An emergency
Transponder malfunction
Radio communication failure
33. The two main design functions of Secondary Surveillance Radar (SSR) Mode S are
Continuous automatic position reporting using Global Positioning system (GPS) satellites and collision avoidance using TCAS II
Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability.
Collision avoidance using TCAS II and improved long range (HF) communication capability.
The elimination of ground to air communications and the introduction of automatic separation between aircraft using TCAS II
34. Mode A or C garbling may occur to?
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 with a difference in slant range of less than 1.7 nm.
Two or more aircraft in different directions from the ground station with a difference in slant range of less than 1.7 nm.
Two or more aircraft in different directions from the interrogator with a difference in slant range of less than 1.7 nm.
35. Garbling in mode A and C may occur?
Two or more aircraft in different directions from the ground station with a difference in slant range of less than 1.7 nm.
Two or more aircraft in the same direction from the ground station with a difference in slant range of less than 1.7 nm.
Two or more aircraft in different directions 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.
36. In special conditions signals, to signify, to signify radio failure, which of the following codes should you select on your transponder?
7600
IDENT
7500
7700
37. Secondary surveillance radar(SSR) information is?
Not mandatory for aircraft operating in controlled airspace.
Not displayed on a screen but received by fax at the radar controller's station.
Displayed on the same screen as primary radar information.
Displayed on a screen next to the primary radar screen.
38. When an aircraft is operating its secondary surveillance radar SSR in mode C an air traffic controller's presentation gives information regarding the aircraft's indicated flight level in increments of?
100 ft
250 ft.
150 ft.
200 ft.
39. The availability of 4096 codes in SSR is applicable to Mode?
A
S
C
All of the answers are correct.
40. In order to indicate an emergency situation, the aircraft Secondary Surveillance Radar (SSR) transponder should be set to
7700
7500
7000
7600
41. In the SSR terminology "de-fruiting" means?
Displaying only aeroplanes with a selected destination.
Removing all different colours from the display, making it a mono-colour display.
The removal from the display of random responses.
Displaying only aeroplanes changing altitude.
42. Why is the effect of returns from storms not a problem with SSR?
The frequency is too high.
SSR does not use the echo principle.
The PRF is jittered.
By the use of MTI to remove stationary and slow moving returns.
43. Which statement with respect to interrogation modes is correct?
Mode S Broadcast will transmit information to all mode S transponders.
Mode S Selective will trigger replies of all mode S transponders. Mode A/C transponders are suppressed.
Modes S only all-call will trigger transponder replies of all A/C/S transponders.
Intermode A/C/S all call intermode A/C only all call, differ in the pulse spacing used between the P1 and P3 pulses.
44. Which of the following Secondary Surveillance Radar (SSR) codes is used to indicate transponder malfunction?
4096
7600
9999
45. Why is a secondary radar display screen free of storm clutter?
The principle of 'echo' return is not used in secondary radar.
A moving target indicator facility suppresses the display of static or near static returns.
The frequencies employed are too low to give returns from moisture sources.
The frequencies employed are too high to give returns from moisture sources.
46. Which of the following statements regarding Mode S is most correct?
Mode S is used to assist GPS calculations.
Mode S transponders reduce R/T traffic and also provide the aircraft with a datalink facility.
Mode S and Mode A/C transponder use different frequencies in operation.
Mode S transponders are used with the radio altimeter.
47. The selection of code 2000 on an aircraft SSR transponder indicates
An emergency
Transponder malfunction
Unlawful interference with the planned operation of the flight.
Entry into airspace from an area where SSR operation has not been required.
48. In order to indicate unlawful interference with the planned operation of the flight, the aircraft secondary Surveillance Radar (SSR) transponder should be selected to
7500
7600
7000
7700
49. Which statement is correct with respect to selections on the transponder control panel?
With ON selected a reply in the modes A, C, and S, can be transmitted.
The correct ICAO 24 bits aircraft address code must be inserted on the control panel.
With the selector knobs the four digits of the squawk can be selected using the decimal symbols 0 through 9.
With ALT selected a reply in the modes A, C, and S, can be transmitted.
50. What is the maximum number of usable Secondary Surveillance Radar (SSR) transponder codes?
1000
760
4096
3600
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