Question Bank

1. The following statements deal with precipitation, turbulence and icing. Select the list containing the most likely alternatives for NS cloud

2. The temperature at FL 80 is +6°C. What will the temperature be at FL 130 if the ICAO standard lapse rate is applied ?

3. The QNH at an airfield located 200 metres above sea level is 1009 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QFF?

4. How would you characterise an air temperature of -15°C at the 700 hPa level over western Europe?

5. How would you characterise an air temperature of -30°C at the 300 hPa level over western Europe?

6. Which of the following conditions are most favourable to the formation of mountain waves ?

7. Which of the following conditions is most likely to lead to the formation of advection fog ?

8. An airmass is unstable when

9. Between which latitudes are you most likely to find the region of travelling low pressure systems ?

10. What is the average height of the jet core within a polar front jet stream?

11. The 0° isotherm is forecast to be at FL 50. At what FL would you expect a temperature of -6° C?

12. The barometric compensator of an altimeter is locked on reference 1013.2 hPa. The aircraft has to land on a point with an elevation of 290 feet where the QNH is 1023 hPa.Assuming that 1 hPa corresponds to 27 FT, the reading on the altimeter on the ground will be

13. Strongly developed cumulus clouds are an indication of

14. Which of the following types of clouds are evidence of unstable air conditions?

15. Which of the following cloud types is a medium level cloud ?

16. What, approximately, is the average height of the tropopause over the equator ?

17. At a certain position, the temperature on the 300 hPa chart is -48°C, according to the tropopause chart, the tropopause is at FL 330. What is the most likely temperature at FL 350 ?

18. You must make an emergency landing at sea. The QNH of a field on a nearby island with an elevation of 4000 FT is 1025 hPa and the temperature is -20°C. What is your pressure altimeter reading when landing if 1025 hPa is set in the subscale?

19. Which type of fog is likely to form when air having temperature of 15°C and dew point of 12°C blows at 10 knots over a sea surface having temperatures of 5°C ?

20. How does relative humidity and the dewpoint in an unsaturated air mass change with varying temperature?

21. If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?

22. The decrease in temperature, per 100 metres, in a saturated rising parcel of air at lower level of the atmosphere is approximately

23. Which one of the following statements applies to the tropopause?

24. An isohypse (contour)

25. Supercooled droplets can be encountered

26. An inversion is

27. Freezing precipitation occurs

28. What type of low pressure area is associated with a surface front?

29. A high pressure area (shallow pressure gradient) covers an area of the Mediterranean Sea and its nearby airport. What surface wind direction is likely at the airport on a sunny afternoon?

30. Clouds, fog or dew will always be formed when

31. When water evaporates into unsaturated air

32. The presence of altocumulus lenticularis is an indication of the

33. Which of the following conditions are you most likely to encounter when approaching an active warm front at medium to low level ?

34. You are flying at FL 130, and your true altitude is 12000 FT. What is the temperature deviation from that of the standard atmosphere at FL 130 (QNH 1013,2 hPa) ?

35. Geostrophic wind

36. Which of the following is the definition of relative humidity ?

37. At what time of day, or night, is radiation fog most likely to occur?

38. During the winter months in mid-latitudes in the northern hemisphere, the polar front jet stream moves toward thesouth and speed increases

39. The rate of decrease of temperature with height per 100 m in the International Standard Atmosphere is

40. A plain in Western Europe with an average height of 500 m (1600 FT) above sea level is covered with a uniform CC layer of cloud during the summer months. At what height above the ground is the base of this cloud to be expected?

41. Generally northern hemisphere winds at 5000 FT/AGL are southwesterly while most of the surface winds are southerly. What is the primary reason of difference between these two wind directions?

42. An aircraft is approaching under visual flight rules an airfield whose runway is parallel to the coast. When downwind over the sea, the airfield is on the left. What wind effect should be anticipated on final approach and landing during a sunny afternoon ?

43. Which of the following cloud is classified as low level cloud ?

44. Fair weather cumulus often is an indication of

45. What of the following is the most important constituent in the atmosphere from a weather stand-point ?

46. In the northern hemisphere with an anticyclonic pressure system the geostrophic wind at 2000 FT over the sea is 060/15. At the same position the surface wind is most likely to be

47. An inversion is

48. In which zone of a jet stream is the strongest CAT to be expected ?

49. The relative humidity of a sample air mass is 50%. How is the relative humidity of this air mass influenced by changes of the amount of water vapour in it?

50. An altimeter adjusted to 1013 hPa indicates an altitude of 3600 FT. Should this altimeter be adjusted to the local QNH value of 991 hPa, the altitude indicated would be