Vayudoot Aviation

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

Displaying only aeroplanes changing altitude.

Removing all different colours from the display, making it a mono-colour display.

The removal from the display of random responses.

Displaying only aeroplanes with a selected destination.

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

Primary

Precision approach

Secondary surveillance

Security surveillance

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

QNH unless QFE is in use.

WGS 84 Datum.

QNH

1013.2 hPa.

4. Consider the following statements on SSR Mode S?

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

All of the statements are correct.

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.

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

1090 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.

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

6. The selection of code 7700 on an aircraft SSR transponder indicates

Transponder malfunction

Unlawful interference with the planned operation of the flight

Radio communication failure

An emergency

7. How does a mode S interrogator identify aircraft?

An eight bit identifier, which gives 212 unique combinations.

The P3 pulse.

The four letter SELCAL code.

A 24 bit identifier, giving over 16 million combinations.

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

Secondary Surveillance Radar (SSR)

Aerodrome Surface Movement Radar

Global positioning system (GPS).

Airborne weather Radar (AWR).

9. Garbling is caused by?

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.

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

10. With SSR interrogation and response signals?

Are separated by 63 MHz.

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

Are standard frequencies separated by 60 MHz.

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

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

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.

Mode S is used to assist GPS calculations.

12. 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

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

7500

7000

7700

7600

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

1090 MHz 1090 MHz.

1090 MHz 1030 MHz.

1030 MHz 1030 MHz.

1030 MHz 1090 MHz.

15. 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 ?

FL3506.

FL35064.

FL351.

FL350.

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

An emergency

Radio communication failure

Transponder malfunction

Unlawful interference with the planned operation of the flight

17. What SSR modes are frequently used by ATC

Mode A, mode B and mode C.

Mode A and mode B.

Mode A and mode C.

Mode C and mode D.

18. 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.

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

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

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

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

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

Primary radar.

Doppler radar.

Continuous wave radar.

Secondary radar.

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

7600

7500 plus mode C.

7500

7600 plus mode C.

22. When both SSR and primary radar is presented on the controller's display?

Altitude information is presented for all targets.

The primary radar information is superfluous.

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

The SSR information is more accurate in bearing and distance.

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

Aircraft altitude.

Aircraft position, SSR code and altitude.

Aircraft positions only.

Aircraft positions and SSR code.

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

What service may be provided by the SSR.

The ATC code to be sent to the aircraft.

What mode is used.

The identification of the SSR.

25. "Fruiting" is caused by?

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

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 in code proximity responding to the same interrogator.

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

All modes.

Mode S.

Mode C only.

Mode A only.

27. With regard to SSR?

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.

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

28. 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?

200 ft.

150 ft.

100 ft

250 ft.

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

4 digits, forming any of 9999 different codes.

4 digits, forming any of 4096 different codes.

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

4 digits, forming any of 7777 different codes.

30. 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.

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

4096

7600

9999

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

The controller will be urged to identify the aeroplane.

Mode A will automatically be selected.

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".

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

The PRF is jittered.

The frequency is too high.

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

SSR does not use the echo principle.

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

Aircraft altitude as indicated on the captain's altimeter.

Aircraft pressure altitude.

Aircraft height above the surface.

Aircraft height above QFE.

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

Unlawful interference with the planned operation of the flight.

Radio communication failure.

An emergency.

Transponder malfunction.

37. A mode S transponder will?

Respond normally to mode A or C interrogations.

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

Respond to mode A interrogations but not to mode C.

Not respond to interrogations on mode A.

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

The transmission power of the aircraft interrogator.

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

The RRP.

The transmission power of the ground interrogator.

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

3600

1000

760

4096

40. 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 and mode C transponders operate on different frequencies.

Mode S transponders are used to assist GPS positioning.

41. 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.

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.

42. Garbling in mode A and C may occur?

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.

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.

43. The ATC transponder system, excluding mode S, contains

Two modes, each 1024 codes.

Four modes, each 4096 codes.

Four modes, each 1024 codes.

Two modes, each of 4096 codes.

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

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.

Sends out a special pulse after the normal pulse train.

Sends out a special pulse before the normal pulse train.

45. 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

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

Altitude based on regional QNH.

Flight level based on 1013.25 hPa.

Aircraft height based on sub-scale setting.

Height based on QFE.

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

7700

7500

7600

7000

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

Unlawful interference with the planned operation of the flight.

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

Transponder malfunction

An emergency

49. Why do clouds not appear on the secondary radar screens

Too high a frequency.

They do not provide an echo by returning signals.

Too low a frequency.

The transmit and receive signals are on different frequencies.

50. The frequency of an SSR ground transmission is

1120 +/- 0.6 Mhz.

1050 +/- 0.5 Mhz.

1090 +/- 0.3 Mhz.

1030 +/- 0.2 Mhz.

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