Vayudoot Aviation

1. Mode A or C garbling may occur to?

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.

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

Precision approach

Security surveillance

Secondary surveillance

Primary

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

7500

7600

0000

7700

4. Garbling is caused by?

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.

Aeroplanes in close proximity responding to the same interrogator.

5. The code transmitted by a SSR transponder consists of

Phase differences.

Amplitude differences.

Frequency differences.

Pulses

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

7600

7600 plus mode C.

7500

7500 plus mode C.

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

1090 MHz 1090 MHz.

1090 MHz 1030 MHz.

1030 MHz 1090 MHz.

1030 MHz 1030 MHz.

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

The sub-scale setting on the altimeter.

1013.2 hPa.

Any of the above as directed by ATC.

Area QNH.

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

+/- 25 feet.

+/- 50 feet.

+/- 100 feet.

+/- 75 feet.

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

Airborne weather Radar (AWR).

Global positioning system (GPS).

Aerodrome Surface Movement Radar

Secondary Surveillance Radar (SSR)

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

Mode A will automatically be selected.

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

The controller will be urged to identify the aeroplane.

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

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

IDENT (Identification)

STBY(Standby)

NORMAL

OFF

13. Secondary surveillance radar(SSR) information is?

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

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.

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

An emergency

Transponder malfunction

Radio communication failure

Unlawful interference with the planned operation of the flight

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

7600

7500

7000

7700

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

QNH

WGS 84 Datum.

QNH unless QFE is in use.

1013.2 hPa.

17. 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 and SSR code.

Aircraft positions only.

Aircraft altitude.

18. 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

150 ft.

250 ft.

19. 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.

20. SSR in ATC use?

Uses primary radar techniques.

Is complementary to primary radar.

Replaces primary radar.

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

21. 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.

22. 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 interrogations only.

Mode C and Ident Interrogations.

Mode A and C interrogations.

Mode A interrogations only.

23. With SSR interrogation and response signals?

Are separated by 63 MHz.

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.

24. 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.

Altitude information is presented for all targets.

The primary radar information is superfluous.

25. With regard to SSR?

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

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.

26. 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.

Not respond to interrogations on mode A.

Respond normally to mode A or C interrogations.

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

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

4 digits, forming any of 9999 different codes.

4 digits, forming any of 7777 different codes.

4 digits, forming any of 4096 different codes.

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

Flight level based on 1013.25 hPa.

Aircraft height based on sub-scale setting.

Altitude based on regional QNH.

Height based on QFE.

29. 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.

30. 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.

31. 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

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

Aircraft height above QFE.

Aircraft pressure altitude.

Aircraft height above the surface.

Aircraft altitude as indicated on the captain's altimeter.

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

Four modes, each 1024 codes.

Two modes, each 1024 codes.

Two modes, each of 4096 codes.

Four modes, each 4096 codes.

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

Unlawful interference with the planned operation of the flight.

Transponder malfunction.

An emergency.

Radio communication failure.

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

1000

760

4096

3600

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

7500

2000

0000

7000

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

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.

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

The principle of 'echo' return is not used in secondary radar.

38. 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 12 boxes.

Up to 4096 codes in 8 boxes.

Up to 4096 codes in 4 boxes.

Up to 2048 codes in 4 boxes.

39. Which statement is correct with respect to selections on the transponder 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.

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

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

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.

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

41. The frequency of an SSR ground transmission is

1050 +/- 0.5 Mhz.

1120 +/- 0.6 Mhz.

1090 +/- 0.3 Mhz.

1030 +/- 0.2 Mhz.

42. 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.

43. 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.

FL351.

FL35064.

FL350.

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

Mode S transponders are used with the radio altimeter.

Mode S is used to assist GPS calculations.

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

Mode S transponders reduce R/T traffic and also provide the aircraft with a datalink facility.

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

All modes.

Mode A only.

Mode C only.

Mode S.

46. The SSR conspicuity code is ?

0033

760

2000

7000

47. 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

Transponder malfunction

Unlawful interference with the planned operation of the flight.

48. SSR is not affected by weather clutter because?

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

It uses different frequencies for transmission and reception.

The frequency used penetrates clouds.

The equipment uses a moving target indicator.

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

Mode S transmits a 3D position.

A TCAS II equipped aircraft will have mode S because?

The datalink is required to co-ordinate evasive manoeuvres.

True altitude is obtained from mode S.

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

Radio communication failure

Transponder malfunction

Unlawful interference with the planned operation of the flight

An emergency

Question Bank

Questions for SSR