Vayudoot Aviation

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

Transponder malfunction

Unlawful interference with the planned operation of the flight

An emergency

Radio communication failure

2. 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 - 25 FT.

+ or - 50 FT

+ or - 75 FT.

3. 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.

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

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.

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

QNH

QNH unless QFE is in use.

WGS 84 Datum.

1013.2 hPa.

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

Transponder malfunction

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

Unlawful interference with the planned operation of the flight.

An emergency

6. Garbling is caused by?

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

Aeroplanes in close proximity responding to the same interrogator.

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

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

7. 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 mandatory for aircraft operating in controlled airspace.

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

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

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

The frequencies employed are too high 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.

9. SSR is not affected by weather clutter because?

It uses different frequencies for transmission and reception.

The frequency used penetrates clouds.

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

The equipment uses a moving target indicator.

10. 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.

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

4 digits, forming any of 9999 different codes.

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

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.

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.

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

7000

7500

0000

2000

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

7700

7500

7600

0000

14. 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.

Are standard frequencies separated by 60 MHz.

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

15. 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 8 boxes.

Up to 4096 codes in 4 boxes.

Up to 2048 codes in 4 boxes.

Up to 4096 codes in 12 boxes.

16. 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.

17. The code transmitted by a SSR transponder consists of

Pulses

Amplitude differences.

Phase differences.

Frequency differences.

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

Secondary Surveillance Radar (SSR)

Global positioning system (GPS).

Aerodrome Surface Movement Radar

Airborne weather Radar (AWR).

19. Mode A or C garbling may occur to?

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.

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

Transponder malfunction.

Unlawful interference with the planned operation of the flight.

An emergency.

Radio communication failure.

21. The SSR conspicuity code is ?

2000

7000

0033

760

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

Mode S Broadcast will transmit information to all mode 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.

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.

23. 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.

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

Doppler radar.

Secondary radar.

Continuous wave radar.

Primary radar.

25. SSR in ATC use?

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

Replaces primary radar.

Is complementary to primary radar.

Uses primary radar techniques.

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

The transmit and receive signals are on different frequencies.

They do not provide an echo by returning signals.

Too low a frequency.

Too high a frequency.

27. 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.

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.

28. A mode S transponder will?

Respond normally to mode A or C interrogations.

Not respond to interrogations on mode A.

Respond to mode A interrogations but not to mode C.

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

29. 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.

30. The SSR transceiver interrogates on ..... and receives on ....?

1030 MHz 1090 MHz.

1030 MHz 1030 MHz.

1090 MHz 1090 MHz.

1090 MHz 1030 MHz.

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

7000

7600

7700

7500

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

Secondary surveillance

Primary

Precision approach

Security surveillance

33. 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.

A TCAS II equipped aircraft will have mode S because?

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

The PRF is jittered.

SSR does not use the echo principle.

The frequency is too high.

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

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

+/- 50 feet.

+/- 75 feet.

+/- 100 feet.

+/- 25 feet.

36. 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.

1090 MHz 1030 MHz.

1030 MHz 1030 MHz.

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

OFF

IDENT (Identification)

NORMAL

STBY(Standby)

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

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".

Mode A will automatically be selected.

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

7600

9999

4096

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

Two modes, each of 4096 codes.

Four modes, each 4096 codes.

Four modes, each 1024 codes.

Two modes, each 1024 codes.

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

7500

7600

7700

IDENT

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

Mode S and mode C transponders operate on different frequencies.

Mode S transponders are used with TCAS II.

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

Mode S transponders are used to assist GPS positioning.

43. 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

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

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.

Altitude information is presented for all targets.

45. What SSR modes are frequently used by ATC

Mode A and mode C.

Mode A and mode B.

Mode C and mode D.

Mode A, mode B and mode C.

46. 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 ON selected a reply in the modes A, C, and S, can be transmitted.

With ALT 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.

47. 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 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.

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

7600

7500

7000

7700

49. 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.

50. The frequency of an SSR ground transmission is

1030 +/- 0.2 Mhz.

1050 +/- 0.5 Mhz.

1120 +/- 0.6 Mhz.

1090 +/- 0.3 Mhz.

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