RADIO NAV-RH-THEORY-CHAPTER9-AIRBORNE WEATHER RADAR

1. On a colour radar, a bright red echo indicates:




2. When switching on the weather radar, after start-up a single very bright line appears on the screen.This means that the:





3. Which of the following equipment uses primary radar principles?





4. AWR in the ___ mode progressively ___ as distances ___ to equalise screen brightness





5. In an Airborne Weather Radar the areas of greatest turbulence are usually indicated on the screen by:





6. The frequency of AWR is:





7. If the AWR transmitter is required to be switched on before take-off the scanner should be tilted up with:





8. The ISO-ECHO facility of an airborne weather radar is provided in order to:





9. The ISO-ECHO circuit is incorporated in the AWR:





10. A weather radar, set to the 100 NM scale, shows a squall at 50 NM. By changing the scale to 50 NM, the return on the radar screen should:





11. In Airborne Weather Radar (AWR), the main factors which determine whether a cloud will be detected are:





12. In the MAPPING MODE the airborne weather radar utilises a:





13. In an AWR with a colour CRT areas of greatest turbulence are indicated by:





14. In an AWR with a 5 deg beam width, how do you orientate the scanner to receive returns from clouds at or above your level?





15. Which of the following is a complete list of airborne weather radar antenna stabilisation axes?





16. The colours used on a conventional AWR to indicate increasing intensity of returns are:





17. Before commencing a flight the weather radar should:





18. The ASMR operates in the ___ band, the antenna rotates at ___ rpm can ___ distinguish between aircraft types.





19. The Cosecant squared beam is used for mapping in the AWR because:





20. The iso-echo feature of an airborne weather radar can be used to detect:





21. The AWR can be used on the ground provided:
i The aircraft is clear of personnel, buildings and vehicles
ii The conical beam is selected
iii Maximum uplift is selected
iv The AWR must never be operated on the ground





22. While using the AWR in the weather mode, the strongest returns on the screen indicate:





23. Which of the following lists the phenomena least likely to be detected by radar?





24. Typical Airborne Weather Radar (AWR) is gyro stabilised within limits in:





25. Which axes is the AWR stabilised in:





26. Which type of cloud does the AWR detect?





27. In order to ascertain whether a cloud return on an Aircraft Weather Radar (AWR) is at or above the height of the aircraft, the tilt control should be set to: (Assume a beam width of 5o)





28. Which of the following cloud types is most readily detected by airborne weather radar when using the weather beam?





29. In an Airborne Weather Radar that has a colour cathode ray tube (CRT) increasing severity of rain and turbulence is generally shown by a change ofcolour from:





30. The advantage of the use of slotted antennas in modern radar technology is to:





31. The pencil shaped beam of an airborne weather radar is used in preference to the mapping mode for the determination of ground features:





32. In weather radar the use of a cosecant beam in Mapping mode enables:





33. A height ring can be used:





34. A frequency of airborne weather radar is:





35. On an AWR colour display, the sequence of colours indicating increasing water droplet size is:





36. The theoretical maximum range for an Airborne Weather Radar is determined by the:





37. In general the operation of airborne weather radar equipment on the ground is:





38. With the AWR set at 100 nm range a large cloud appears at 50 nm. If the range is reduced to 50 nm:





39. On switching on the AWR a single line appears on the display. This means that:





40. AWR in the contour mode is used for:





41. What wavelength is typically chosen for AWR systems?





42. Ground checks of an AWR are:





43. Which of the following lists phenomena that CANNOT be detected by weather radar?





44. The main factors which affect whether an AWR will detect a cloud are:





45. A frequency of 10 GHz is considered to be the optimum for use in an airborne weather radar system because:





46. Airborne weather radars are generally based on the use of:





47. Weather Radar uses (i) radar in the (ii) band:





48. When using the AWR to detect long range ground features the most suitable mode of operation or beam selected would be:





49. The AWR transmitter is not normally selected on the ground because:





50. On a colour radar, the greatest turbulence is likely in an area where the targets:





51. In an Airborne Weather Radar that has a colour cathode ray tube (CRT) the areas of greatest turbulence are indicated on the screen by:





52. Which of the following wavelengths would give the best penetration of weather?





53. The airborne weather radar (AWR) cannot detect:





54. The use of the AWR on the ground is:





55. The frequency band of most ATC radars and weather radars is:





56. Weather radar is used by the pilot to assist in the:





57. Airborne weather radar’s use a frequency of approximately 9 GHz because:




58. In which mode of operation does the aircraft weather radar use a cosecant radiation pattern?





59. In which frequency band do most airborne weather radars operate?




60. A side lobe from the aerial of a weather radar may produce an echo on the screen known as A ‘height ring’. The pilot can use this:





61. Airborne weather radar systems use a wavelength of approximately 3 cm in order to:





62. Is it permissible for weather radar to be operated on the ground?





63. On the AWR display the most severe turbulence will be shown:





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