Results
Q1. When switching on the weather radar, after start-up, a single very bright line appears on the screen. This means that the:
scanning of the cathode ray tube is faulty
Q2. A frequency of 10 GHz is considered to be the optimum for use in an airborne weather radar system because:
the larger water droplets will give good echoes and the antenna can be kept relatively small
Q3. Which of the following cloud types is most readily detected by airborne weather radar when using the ‘weather beam’?
cumulus
Q4. In weather radar the use of a cosecant beam in ‘Mapping’ mode enables:
scanning of a large ground zone producing echos whose signals are practically independent of distance
Q5. The pencil shaped beam of an airborne weather radar is used in preference to the mapping mode for the determination of ground features:
beyond 50 to 60 NM because more power can be concentrated in the narrower beam
Q6. The stabilisation of the weather radar, aerial is effective
For up to +/- 20° of combined roll and pitch
Q7. A weather radar, set to the 100 NM scale, shows a squall at 50NM. By changing the scale to 50 NM, the return on the radar screen should:
increase in area and move to the top of the screen
Q8. 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 of colour from:
green to yellow to red
Q9. A frequency of airborne weather radar is :
9375 MHz
Q10. In order to ascertain whether a cloud return on an Aircraft Weather Radar (AWR) is at or above the height of the aircaft, the tilt control should be set to: (Assume a beam width of 5°)
2.5° up
Q11. When the airborne weather radar is operating in it’s primary mode, to detect precipitation,
The radar beam is pencil-shaped
Q12. In the MAPPING MODE the airborne weather radar utilises a:
fan shaped beam effective up to a maximum of 50 NM to 60 NM range
Q13. Which of the following lists phenomena that CANNOT be detected by weather radar?
snow; clear air turbulence
Q14. Airborne weather radar uses a particularly high frequency radar signal, at 9 – 12 GHz, in order to
Get good returns from droplets of water and other sorts of precipitation
Q15. On the airborne weather radar display, different colours are used
To display different intensity of precipitation
Q16. Using the airborne weather radar, before take-off
The radar transmitter should not be operated when personnel is observed in the sector ahead of the aircraft
Q17. You want to use your airborne weather radar to detect areas with turbulence. Consider the following statements:
If you are flying at low altitude, the detection of turbulence at levels below the aircraft may difficult because of ground returns
Q18. The advantage of the use of slotted antennas in modern radar technology is to:
virtually eliminate lateral lobes and as a consequence concentrate more energy in the main beam
Q19. In which mode of operation does the aircraft weather radar use a cosecant radiation pattern.
MAPPING
Q20. In Airborne Weather Radar (AWR), the main factors which determine whether a cloud will be detected are:
size of the water drops; wavelength/frequency used
Q21. The ISO-ECHO facility of an airborne weather radar is provided in order to:
detect areas of possible severe turbulence in cloud
Q22. Airborne weather radar systems use a wavelength of approximately 3 cm in order to:
detect the larger water droplets
Q23. Which of the following is a complete list of airborne weather radar antenna stabilisation axes?
roll and pitch
Q24. In general the operation of airborne weather radar equipment on the ground is:
only permitted with certain precautions, to safeguard health of personnel and to protect equipment
