Vayudoot Aviation

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

+/- 100 feet.

+/- 75 feet.

+/- 50 feet.

+/- 25 feet.

2. Which statement is correct with respect to selections on the transponder control panel?

With the selector knobs the four digits of the squawk can be selected using the decimal symbols 0 through 9.

With ALT selected a reply in the modes A, C, and S, can be transmitted.

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

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

3. 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.

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

What mode is used.

The ATC code to be sent to the aircraft.

What service may be provided by the SSR.

The identification of the SSR.

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

Mode S.

All modes.

Mode A only.

Mode C only.

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

IDENT

7500

7700

7600

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

7700

7500

7600

7000

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

7500

7000

0000

2000

9. The frequency of an SSR ground transmission is

1090 +/- 0.3 Mhz.

1050 +/- 0.5 Mhz.

1030 +/- 0.2 Mhz.

1120 +/- 0.6 Mhz.

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

Security surveillance

Secondary surveillance

Precision approach

Primary

11. "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.

Aeroplanes in code proximity responding to the same interrogator.

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

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

Four modes, each 1024 codes.

Two modes, each 1024 codes.

Four modes, each 4096 codes.

Two modes, each of 4096 codes.

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

OFF

IDENT (Identification)

STBY(Standby)

NORMAL

14. 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

7000

7500

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

Unlawful interference with the planned operation of the flight

Radio communication failure

Transponder malfunction

An emergency

16. 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.

Area QNH.

Any of the above as directed by ATC.

1013.2 hPa.

17. Garbling is caused by?

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.

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

Aeroplanes in close proximity responding to the same interrogator.

18. 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?

2000

7000

5000

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

Long (30.25 m/sec) P3 pulse.

Special Position Identification (SPI) pulse.

Twelve-pulse train giving 212 possible codes.

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

21. SSR is not affected by weather clutter because?

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

The equipment uses a moving target indicator.

The frequency used penetrates clouds.

It uses different frequencies for transmission and reception.

22. The SSR conspicuity code is ?

7000

2000

0033

760

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

Mode S transmits a 3D position.

True altitude is obtained from mode S.

The datalink is required to co-ordinate evasive manoeuvres.

A TCAS II equipped aircraft will have mode S because?

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

The transmission power of the ground interrogator.

The transmission power of the aircraft interrogator.

The RRP.

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

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

Radio communication failure

Transponder malfunction

Unlawful interference with the planned operation of the flight

An emergency

26. 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 and mode C transponders operate on different frequencies.

Mode S transponders are used with TCAS II.

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

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

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

Mode S is used to assist GPS calculations.

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.

29. With regard to SSR?

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.

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

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

Sends out a special pulse after the normal 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 in the X position in the pulse train.

31. 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.

Modes S only all-call will trigger transponder replies of all A/C/S transponders.

Mode S Selective will trigger replies of all mode S transponders. Mode A/C transponders are suppressed.

32. SSR in ATC use?

Uses primary radar techniques.

Is complementary to primary radar.

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

Replaces primary radar.

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

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.

Displaying only aeroplanes changing altitude.

34. 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 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 different directions from the ground station with a difference in slant range of less than 1.7 nm.

35. 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 interrogations only.

Mode A and C interrogations.

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

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.

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

37. Consider the following statements on SSR Mode S?

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

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.

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

The transmit and receive signals are on different frequencies.

Too low a frequency.

They do not provide an echo by returning signals.

Too high a frequency.

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

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".

Mode A will automatically be selected.

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

SSR does not use the echo principle.

The frequency is too high.

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

The PRF is jittered.

41. Secondary surveillance radar(SSR) information is?

Displayed on the same screen as primary radar information.

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.

42. 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 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.

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 - 100 FT.

+ or - 50 FT

+ or - 75 FT.

44. How does a mode S interrogator identify aircraft?

The four letter SELCAL code.

An eight bit identifier, which gives 212 unique combinations.

A 24 bit identifier, giving over 16 million combinations.

The P3 pulse.

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

7700

7500

7600

7000

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

7600

7500

7600 plus mode C.

7500 plus mode C.

47. 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.

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

The primary radar information is superfluous.

The SSR information is more accurate in bearing and distance.

Altitude information is presented for all targets.

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

49. 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.

Continuous automatic position reporting using Global Positioning system (GPS) satellites and collision avoidance using TCAS II

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

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

50. Data transmission and exchange is conducted on?

Mode D.

Mode S.

Mode A.

Mode C.

Question Bank

Questions for SSR