Vayudoot Aviation

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

Global positioning system (GPS).

Secondary Surveillance Radar (SSR)

Airborne weather Radar (AWR).

Aerodrome Surface Movement Radar

2. SSR in ATC use?

Uses primary radar techniques.

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

Replaces primary radar.

Is complementary to primary radar.

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

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.

4 digits, forming any of 4096 different codes.

4. The SSR conspicuity code is ?

2000

7000

760

0033

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

0000

7500

7700

7600

6. 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.

100 ft

250 ft.

150 ft.

7. 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".

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.

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

7000

0000

2000

7500

9. The code transmitted by a SSR transponder consists of

Amplitude differences.

Pulses

Phase differences.

Frequency differences.

10. 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.

11. Data transmission and exchange is conducted on?

Mode D.

Mode S.

Mode C.

Mode A.

12. "Fruiting" is caused by?

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

Aeroplanes in code proximity responding to the same interrogator.

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

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

13. 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.

14. 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.

15. 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

7600

7500

7000

16. 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

17. Secondary surveillance radar(SSR) information is?

Displayed on the same screen as primary radar information.

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

Not mandatory for aircraft operating in controlled airspace.

Displayed on a screen next to the primary radar screen.

18. Garbling is caused by?

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

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.

19. A mode S transponder will?

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.

Not respond to interrogations on mode A.

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

+/- 100 feet.

+/- 75 feet.

+/- 25 feet.

+/- 50 feet.

21. 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.

SSR does not use the echo principle.

The frequency is too high.

22. 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.

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

23. 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

24. What SSR modes are frequently used by ATC

Mode A, mode B and mode C.

Mode A and mode C.

Mode C and mode D.

Mode A and mode B.

25. 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 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.

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

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

The RRP.

The transmission power of the aircraft interrogator.

The transmission power of the ground interrogator.

27. How does a mode S interrogator identify aircraft?

The P3 pulse.

The four letter SELCAL code.

A 24 bit identifier, giving over 16 million combinations.

An eight bit identifier, which gives 212 unique combinations.

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

Aircraft position, SSR code and altitude.

Aircraft positions only.

Aircraft altitude.

Aircraft positions and SSR code.

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

QNH unless QFE is in use.

1013.2 hPa.

WGS 84 Datum.

QNH

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

STBY(Standby)

IDENT (Identification)

NORMAL

OFF

31. 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.

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

Sends out a special pulse after the normal pulse train.

32. 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.

1030 MHz 1030 MHz.

1090 MHz 1090 MHz.

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

IDENT

7600

7500

7700

34. With SSR interrogation and response signals?

Are standard frequencies separated by 60 MHz.

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

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

Are separated by 63 MHz.

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

1030 MHz 1090 MHz.

1090 MHz 1090 MHz.

1030 MHz 1030 MHz.

1090 MHz 1030 MHz.

36. 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 in the aircraft.

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

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

37. 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 4096 codes in 12 boxes.

Up to 2048 codes in 4 boxes.

Up to 4096 codes in 8 boxes.

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

Flight level based on 1013.25 hPa.

Altitude based on regional QNH.

Height based on QFE.

Aircraft height based on sub-scale setting.

39. SSR is not affected by weather clutter because?

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.

The frequency used penetrates clouds.

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 to assist GPS positioning.

Mode S transponders are used with TCAS II.

Mode S and mode C transponders operate on different frequencies.

41. 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.

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

The datalink is required to co-ordinate evasive manoeuvres.

A TCAS II equipped aircraft will have mode S because?

Mode S transmits a 3D position.

True altitude is obtained from mode S.

43. 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 - 25 FT.

+ or - 75 FT.

+ or - 100 FT.

+ or - 50 FT

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

4096

9999

7600

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

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.

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

46. 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, magnetic heading, ground speed, aeroplane callsign.

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

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

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

Special Position Identification (SPI) pulse.

Long (30.25 m/sec) P3 pulse.

Twelve-pulse train giving 212 possible codes.

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

48. 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 and Ident Interrogations.

Mode C interrogations only.

Mode A and C interrogations.

49. 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.

FL350.

FL351.

FL35064.

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

S

All of the answers are correct.

A

C

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