Vayudoot Aviation

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

What mode is used.

The ATC code to be sent to the aircraft.

What service may be provided by the SSR.

The identification of the SSR.

2. The code transmitted by a SSR transponder consists of

Frequency differences.

Pulses

Amplitude differences.

Phase differences.

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

Aerodrome Surface Movement Radar

Secondary Surveillance Radar (SSR)

Global positioning system (GPS).

Airborne weather Radar (AWR).

4. Which statement with respect to interrogation modes is correct?

Intermode A/C/S all call intermode A/C only all call, differ in the pulse spacing used between the P1 and P3 pulses.

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.

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

5. When the ATC transponder "IDENT" button is pressed by the pilot?

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

Mode A will automatically be selected.

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

The controller will be urged to identify the aeroplane.

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

9999

4096

7600

7. 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.

8. What SSR modes are frequently used by ATC

Mode A and mode B.

Mode A and mode C.

Mode A, mode B and mode C.

Mode C and mode D.

9. 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.

All of the statements are correct.

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

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

10. 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.

11. Garbling in mode A and C may occur?

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 interrogator 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.

12. Which statement is correct with respect to selections on the transponder control panel?

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

With ALT selected a reply in the modes A, C, and S, can be transmitted.

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.

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

IDENT (Identification)

OFF

NORMAL

STBY(Standby)

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

The transmission power of the ground interrogator.

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

The transmission power of the aircraft interrogator.

The RRP.

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

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

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.

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

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

Security surveillance

Primary

Precision approach

Secondary surveillance

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

7600

7500

7700

7000

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

2000

7000

0000

7500

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

+/- 50 feet.

+/- 25 feet.

+/- 75 feet.

+/- 100 feet.

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

7600

7500

IDENT

7700

21. With SSR interrogation and response signals?

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

Are standard frequencies separated by 60 MHz.

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

Are separated by 63 MHz.

22. Mode A or C garbling may occur to?

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.

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

23. A mode S transponder will?

Not respond to interrogations on mode A.

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.

24. How does a mode S interrogator identify aircraft?

The four letter SELCAL code.

A 24 bit identifier, giving over 16 million combinations.

The P3 pulse.

An eight bit identifier, which gives 212 unique combinations.

25. 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

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

Destination, flight level, ground speed, aeroplane callsign.

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

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

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

27. "Fruiting" is caused by?

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.

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

Aeroplanes in code proximity responding to the same interrogator.

28. The frequency of an SSR ground transmission is

1120 +/- 0.6 Mhz.

1050 +/- 0.5 Mhz.

1090 +/- 0.3 Mhz.

1030 +/- 0.2 Mhz.

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

S

C

A

All of the answers are correct.

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

Mode S transmits a 3D position.

True altitude is obtained from mode S.

A TCAS II equipped aircraft will have mode S because?

The datalink is required to co-ordinate evasive manoeuvres.

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

1090 MHz 1090 MHz.

1030 MHz 1090 MHz.

1030 MHz 1030 MHz.

1090 MHz 1030 MHz.

32. The selection of code 7600 on an aircraft SSR transponder indicates

An emergency

Transponder malfunction

Radio communication failure

Unlawful interference with the planned operation of the flight

33. 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.

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

A moving target indicator facility suppresses the display of static or near static returns.

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

7000

7500

7700

7600

35. The selection of code 7500 on an aircraft SSR transponder indicates

Transponder malfunction.

An emergency.

Radio communication failure.

Unlawful interference with the planned operation of the flight.

36. 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 interrogations only.

Mode A and C interrogations.

Mode C and Ident Interrogations.

37. 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.

Any of the above as directed by ATC.

The sub-scale setting on the altimeter.

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

QNH

WGS 84 Datum.

1013.2 hPa.

QNH unless QFE is in use.

39. 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

7000

2000

40. The selection of code 2000 on an aircraft SSR transponder indicates

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

Transponder malfunction

An emergency

Unlawful interference with the planned operation of the flight.

41. 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.

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

760

1000

3600

4096

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

7500

0000

7600

7700

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

Aircraft pressure altitude.

Aircraft height above QFE.

Aircraft height above the surface.

Aircraft altitude as indicated on the captain's altimeter.

45. SSR is not affected by weather clutter because?

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

The equipment uses a moving target indicator.

It uses different frequencies for transmission and reception.

The frequency used penetrates clouds.

46. Secondary surveillance radar(SSR) information is?

Displayed on the same screen as primary radar information.

Displayed on a screen next to the primary radar screen.

Not displayed on a screen but received by fax at the radar controller's station.

Not mandatory for aircraft operating in controlled airspace.

47. With regard to SSR?

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

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 on the ground and the transponder is on the ground.

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

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

The PRF is jittered.

The frequency is too high.

SSR does not use the echo principle.

49. 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.

Flight level based on 1013.25 hPa.

Height based on QFE.

50. Data transmission and exchange is conducted on?

Mode D.

Mode C.

Mode S.

Mode A.

Question Bank

Questions for SSR