SSR - Dgca question bank for pilots

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#1. When Mode C is selected on the aircraft SSR transponder the additional information transmitted is:

Altitude based on regional QNH.

Aircraft height based on sub-scale setting.

Height based on QFE.

Flight level based on 1013.25 hPa.

#2. The ground Secondary Surveillance Radar (SSR) equipment incorporates a transmitter and receiver respectively operating in the following frequencies?

1090 MHz 1030 MHz.

1030 MHz 1090 MHz.

1090 MHz 1090 MHz.

1030 MHz 1030 MHz.

#3. Why is a secondary radar display screen free of storm clutter?

The principle of 'echo' return is not used in secondary radar.

The frequencies employed are too high to give returns from moisture sources.

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.

#4. In order to indicate radio failure the aircraft SSR transponder should be selected to code:

7700.

7000.

7500.

7600.

#5. In order to indicate unlawful interference with the planned operation of the flight, the aircraft secondary Surveillance Radar (SSR) transponder should be selected to:

7600.

7500.

7700.

7000.

#6. 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 - 50 FT.

+ or - 75 FT.

+ or - 100 FT.

+ or - 25 FT.

#7. The frequency of an SSR ground transmission is:

1050 +/- 0.5 Mhz.

1090 +/- 0.3 Mhz.

1030 +/- 0.2 Mhz.

1120 +/- 0.6 Mhz.

#8. The two main design functions of Secondary Surveillance Radar (SSR) Mode S are:

Collision avoidance using TCAS II and improved long range (HF) communication capability.

Continuous automatic position reporting using Global Positioning system (GPS) satellites and collision avoidance using TCAS II

The elimination of ground to air communications and the introduction of automatic separation between aircraft using TCAS II

Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability.

#9. The ATC transponder system, excluding mode S, contains:

Four modes, each 1024 codes.

Two modes, each of 4096 codes.

Four modes, each 4096 codes.

Two modes, each 1024 codes.

#10. A secondary radar can provide up to 4096 different codes. These 4096 codes can be used in?

All modes.

Mode A only.

Mode C only.

Mode S.

#11. The code transmitted by a SSR transponder consists of:

Pulses.

Phase differences.

Frequency differences.

Amplitude differences.

#12. Which of the following Secondary Surveillance Radar (SSR) codes is used to indicate transponder malfunction?

7600.

4096.

9999.

0000

SSR uses the following codes:

0000 – Transponder failure.
2000 – Entry into airspace from an area where SSR operation is not required.
7500 – Unlawful interference.
7600 – Radio failure.
7700 – Emergency.

#13. Which one of the following Secondary Surveillance Radar (SSR) codes should be used by aircraft entering airspace from an area where SSR operation has not been required?

5000.

2000.

7000.

#14. What is the maximum number of usable Secondary Surveillance Radar (SSR) transponder codes?

4096.

3600.

1000.

760.

#15. Which of the following equipment works on the interrogator/transponder principle?

Global positioning system (GPS).

Airborne weather Radar (AWR).

Secondary Surveillance Radar (SSR).

Aerodrome Surface Movement Radar.

#16. In order to indicate an emergency situation, the aircraft Secondary Surveillance Radar (SSR) transponder should be set to:

7600.

7500.

7000.

7700.

#17. Which one of the following switch position should be used when selecting a code on the Transponder?

IDENT (Identification).

NORMAL.

STBY(Standby).

OFF.

#18. The selection of code 2000 on an aircraft SSR transponder indicates:

Entry into airspace from an area where SSR operation has not been required.

Unlawful interference with the planned operation of the flight.

An emergency.

Transponder malfunction.

#19. Most aeroplanes are fitted with a transponder which is an essential aspect of ………. Radar?

Primary.

Precision approach.

Security surveillance.

Secondary surveillance.

#20. Secondary surveillance radar(SSR) information is?

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.

Not mandatory for aircraft operating in controlled airspace.

#21. The selection of code 7500 on an aircraft SSR transponder indicates:

Unlawful interference with the planned operation of the flight.

An emergency.

Transponder malfunction.

Radio communication failure.

#22. The selection of code 7600 on an aircraft SSR transponder indicates:

An emergency.

Unlawful interference with the planned operation of the flight.

Radio communication failure.

Transponder malfunction.

#23. The selection of code 7700 on an aircraft SSR transponder indicates:

Radio communication failure.

An emergency.

Transponder malfunction.

Unlawful interference with the planned operation of the flight.

#24. 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 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 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.

#25. A TCAS II equipped aircraft will have mode S because?

The datalink is required to transmit relative position.

Mode S transmits a 3D position.

True altitude is obtained from mode S.

The datalink is required to co-ordinate evasive manoeuvres.

#26. How does a mode S interrogator identify aircraft?

A 24 bit identifier, giving over 16 million combinations.

The four letter SELCAL code.

The P3 pulse.

An eight bit identifier, which gives 212 unique combinations.

#27. With Mode S, each aircraft can be uniquely interrogated and identified by using the?

Twelve-pulse train giving 212 possible codes.

24 bits address code, giving more than 16 million possible combinations.

Special Position Identification (SPI) pulse.

Long (30.25 m/sec) P3 pulse.

#28. 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.

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.

The correct ICAO 24 bits aircraft address code must be inserted on the control panel.

#29. Garbling in mode A and C may occur?

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 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 the same direction from the interrogator with a difference in slant range of less than 1.7 nm.

#30. Which statement with respect to interrogation modes is correct?

Modes S only all-call will trigger transponder replies of all 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 intermode A/C only all call, differ in the pulse spacing used between the P1 and P3 pulses.

Mode S Broadcast will transmit information to all mode S transponders.

#31. The accuracy of SSR height as displayed to the air traffic controller is

+/- 25 feet.

+/- 50 feet.

+/- 75 feet.

+/- 100 feet.

#32. Why do clouds not appear on the secondary radar screens

Too low a frequency.

Too high a frequency.

The transmit and receive signals are on different frequencies.

They do not provide an echo by returning signals.

#33. SSR is not affected by weather clutter because?

The frequency used penetrates clouds.

It uses different frequencies for transmission and reception.

The equipment uses a moving target indicator.

The wavelength is too short to be reflected from cloud droplets.

#34. What most affects the range available from secondary surveillance radar?

The RRP.

The transmission power of the aircraft interrogator.

The transmission power of the ground interrogator.

The height of the aircraft and the height of the ground interrogator.

#35. The spacing between two pulses transmitted by an SSR interrogator decides?

What mode is used.

The ATC code to be sent to the aircraft.

The identification of the SSR.

What service may be provided by the SSR.

#36. With regard to SSR?

The interrogator is on the ground and the transponder is on the ground.

The interrogator is on the ground and the transponder is in the aircraft.

The interrogator is in the aircraft and the transponder is on the ground.

The interrogator is in the aircraft and the transponder is in the aircraft.

#37. Why is the effect of returns from storms not a problem with SSR?

The PRF is jittered.

The frequency is too high.

SSR does not use the echo principle.

By the use of MTI to remove stationary and slow moving returns.

#38. SSR in ATC use?

Replaces primary radar.

Uses primary radar techniques.

Is complementary to primary radar.

Suffers from greater attenuation than primary radar, due to the higher frequencies used.

#39. When both SSR and primary radar is presented on the controller’s display?

Altitude information is presented for all targets.

The SSR information is more accurate in bearing and distance.

The primary radar information is more accurate in bearing and distance.

The primary radar information is superfluous.

#40. With SSR interrogation and response signals?

Are separated by 63 MHz.

Are at variable frequencies set by the controller but are always 63 Mhz apart.

Must be set by the pilot but are always 63 Mhz apart.

Are standard frequencies separated by 60 MHz.

#41. What SSR modes are frequently used by ATC

Mode C and mode D.

Mode A and mode B.

Mode A and mode C.

Mode A, mode B and mode C.

#42. Data transmission and exchange is conducted on?

Mode A.

Mode D.

Mode C.

Mode S.

#43. A mode S transponder will?

Not respond to interrogations on mode A.

Respond normally to mode A or C interrogations.

Respond to mode A interrogations but not to mode C.

Not respond to modes A or C because it is on a different frequency.

#44. Which of the following statements regarding Mode S is most correct?

Mode S and Mode A/C transponder use different frequencies in operation.

Mode S is used to assist GPS calculations.

Mode S transponders are used with the radio altimeter.

Mode S transponders reduce R/T traffic and also provide the aircraft with a datalink facility.

#45. 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 C interrogations only.

Mode A interrogations only.

Mode A and C interrogations.

Mode C and Ident Interrogations.

#46. 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.

#47. 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 ?

FL350.

FL35064.

FL3506.

FL351.

#48. When a Mode C interrogation is responded to, vertica. position of the aircraft is encoded and transmitted This vertical position is referred to?

1013.2 hPa.

Area QNH.

The sub-scale setting on the altimeter.

Any of the above as directed by ATC.

#49. Selection of Mode C on the SSR provides ATC with information based on?

Aircraft height above QFE.

Aircraft pressure altitude.

Aircraft height above the surface.

Aircraft altitude as indicated on the captain's altimeter.

#50. The SSR code for a total radio failure is?

7500.

7600.

7500 plus mode C.

7600 plus mode C.

#51. If an aircraft is hijacked it is recommended that the pilot sets transponder code?

7700.

7500.

7600.

0000.

#52. The SSR conspicuity code is ?

7000.

2000.

0033.

760.

#53. 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.

150 ft.

200 ft.

250 ft.

#54. The SSR transceiver interrogates on ….. and receives on ….?

1030 MHz 1030 MHz.

1090 MHz 1090 MHz.

1090 MHz 1030 MHz.

1030 MHz 1090 MHz.

#55. The vertical position provided by SSR Mode C is referenced to?

QNH.

WGS 84 Datum.

1013.2 hPa.

QNH unless QFE is in use.

#56. What are the frequencies used for interrogation and response for SSR?

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.

1030 MHz for interrogation from the ground, 1090 MHz for response from aircraft.

#57. 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 2048 codes in 4 boxes.

Up to 4096 codes in 12 boxes.

Up to 4096 codes in 8 boxes.

#58. The transponder code set in an SSR system consist of?

4 digits, forming any of 7777 different codes.

4 digits, forming any of 4096 different codes.

4 digits, forming any of 9999 different codes.

2 digits and 2 letters, forming any 4096 different codes.

#59. What SSR Mode A code should be selected when entering European airspace from an area where no code has been allocated?

0000.

2000.

7000.

7500.

#60. Consider the following statements on SSR Mode S?

Mode S will have the ability to transmit short messages from the ground to a particular aircraft.

A mode S interrogator, when installed, will also collect data from old Mode A and C transponders.

Mode S will be able to address any particular one of some 16 million aircraft.

All of the statements are correct.

#61. The availability of 4096 codes in SSR is applicable to Mode?

All of the answers are correct.

#62. A radar which empolys an interrogator/transponder technique is?

Primary radar.

Doppler radar.

Secondary radar.

Continuous wave radar.

#63. What informattion may be displayed on an ATC radar screen connected only to a primary radar system?

Aircraft altitude.

Aircraft positions only.

Aircraft positions and SSR code.

Aircraft position, SSR code and altitude.

#64. “Fruiting” is caused by?

Aeroplanes in code proximity responding to the same interrogator.

Doppler effect on targets moving radially towards or away from the SSR.

An aeroplane's transponder responding to side lobes or reflection of the interrogation signal.

Aeroplanes at range responding to interrogations from another ATC SSR units.

#65. Garbling is caused by?

Aeroplanes in close proximity responding to the same interrogator.

Doppler effect on targets moving radially towards or away from the SSR.

An aeroplane's transponder responding to side lobes or reflections of the interrogation signal.

Aeroplanes at range responding to interrogations from another ATC SSR units.

#66. In the SSR terminology “de-fruiting” means?

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.

Displaying only aeroplanes with a selected destination.

#67. On a typical computer generated SSR display the following data on a particular flight will be shown?

Squawk code, flight level, true heading, aeroplane callsign.

Squawk code, magnetic heading, ground speed, aeroplane callsign.

Squawk code, flight level, ground speed, aeroplane callsign.

Destination, flight level, ground speed, aeroplane callsign.

#68. In special conditions signals, to signify, to signify radio failure, which of the following codes should you select on your transponder?

IDENT.

7500.

7600.

7700.

#69. When the ATC transponder “IDENT” button is pressed by the pilot?

Mode A will automatically be selected.

The controller will be urged to identify the aeroplane.

The aeroplane's identification will be sent to all SSR within range.

The aeroplane's echo on the controller's display will flash or "fill in".

#70. In teh SSR response, the operation of the transponder ident button?

Sends out a special pulse in the X position in the pulse train.

Sends out a special pulse before the normal pulse train.

Sends out a special pulse after the normal pulse train.

Transmits the aeroplane's registration or flight number as a data sequence.

Finish