Vayudoot Aviation

1. The SSR code for a total radio failure is?

7600 plus mode C.

7600

7500 plus mode C.

7500

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

Area QNH.

The sub-scale setting on the altimeter.

Any of the above as directed by ATC.

1013.2 hPa.

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

Secondary surveillance

Primary

Security surveillance

Precision approach

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

Aircraft pressure altitude.

Aircraft height above the surface.

Aircraft altitude as indicated on the captain's altimeter.

Aircraft height above QFE.

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

C

All of the answers are correct.

S

A

6. Data transmission and exchange is conducted on?

Mode C.

Mode A.

Mode S.

Mode D.

7. 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 in the X position in the 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. Which of the following Secondary Surveillance Radar (SSR) codes is used to indicate transponder malfunction?

9999

7600

4096

9. SSR is not affected by weather clutter because?

The frequency used penetrates clouds.

The equipment uses a moving target indicator.

It uses different frequencies for transmission and reception.

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

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

Aircraft positions only.

Aircraft position, SSR code and altitude.

Aircraft positions and SSR code.

Aircraft altitude.

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

Primary radar.

Continuous wave radar.

Doppler radar.

Secondary radar.

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

Radio communication failure.

Transponder malfunction.

Unlawful interference with the planned operation of the flight.

An emergency.

13. Consider the following statements on SSR Mode S?

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.

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

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

Global positioning system (GPS).

Airborne weather Radar (AWR).

Aerodrome Surface Movement Radar

Secondary Surveillance Radar (SSR)

15. 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, flight level, true heading, aeroplane callsign.

Destination, flight level, ground speed, aeroplane callsign.

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

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

4 digits, forming any of 4096 different codes.

4 digits, forming any of 7777 different codes.

4 digits, forming any of 9999 different codes.

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

17. In order to indicate radio failure the aircraft SSR transponder should be selected to code

7600

7500

7000

7700

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

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

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

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.

19. The frequency of an SSR ground transmission is

1090 +/- 0.3 Mhz.

1120 +/- 0.6 Mhz.

1050 +/- 0.5 Mhz.

1030 +/- 0.2 Mhz.

20. 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 2048 codes in 4 boxes.

Up to 4096 codes in 12 boxes.

Up to 4096 codes in 4 boxes.

Up to 4096 codes in 8 boxes.

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

An emergency

Transponder malfunction

Unlawful interference with the planned operation of the flight

Radio communication failure

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

The transmission power of the ground interrogator.

The RRP.

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

The transmission power of the aircraft interrogator.

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

1013.2 hPa.

WGS 84 Datum.

QNH

QNH unless QFE is in use.

24. With SSR interrogation and response signals?

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

Are separated by 63 MHz.

Are standard frequencies separated by 60 MHz.

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

25. The code transmitted by a SSR transponder consists of

Pulses

Frequency differences.

Amplitude differences.

Phase differences.

26. SSR in ATC use?

Replaces primary radar.

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

Is complementary to primary radar.

Uses primary radar techniques.

27. 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.

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

STBY(Standby)

IDENT (Identification)

NORMAL

OFF

29. 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.

30. How does a mode S interrogator identify aircraft?

The four letter SELCAL code.

An eight bit identifier, which gives 212 unique combinations.

The P3 pulse.

A 24 bit identifier, giving over 16 million combinations.

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

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.

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

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

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

An emergency

Unlawful interference with the planned operation of the flight.

Transponder malfunction

33. "Fruiting" is caused by?

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.

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

34. In the SSR terminology "de-fruiting" means?

Displaying only aeroplanes changing altitude.

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.

35. What SSR modes are frequently used by ATC

Mode C and mode D.

Mode A and mode C.

Mode A and mode B.

Mode A, mode B and mode C.

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

7700

7600

IDENT

7500

37. A mode S transponder will?

Respond to mode A interrogations but not to mode C.

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

Respond normally to mode A or C interrogations.

Not respond to interrogations on mode A.

38. 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 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.

39. 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 - 75 FT.

+ or - 100 FT.

+ or - 25 FT.

+ or - 50 FT

40. 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?

7000

2000

5000

41. Which statement regarding Mode S transponders is most correct?

Mode S transponders reduce R/t traffic and provide a datalink facility.

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.

42. The SSR conspicuity code is ?

2000

7000

760

0033

43. 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 and Ident Interrogations.

Mode C interrogations only.

Mode A and C interrogations.

Mode A interrogations only.

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

SSR does not use the echo principle.

The PRF is jittered.

The frequency is too high.

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

45. 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 a screen next to the primary radar screen.

Displayed on the same screen as primary radar information.

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

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

Long (30.25 m/sec) P3 pulse.

Special Position Identification (SPI) pulse.

Twelve-pulse train giving 212 possible codes.

47. When Mode C is selected on the aircraft SSR transponder the additional information transmitted is

Height based on QFE.

Altitude based on regional QNH.

Flight level based on 1013.25 hPa.

Aircraft height based on sub-scale setting.

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

7600

7000

7500

7700

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

4096

760

3600

1000

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

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.

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.

Question Bank

Questions for SSR