50%(2)1 out of 2 people found this document helpful
This preview shows page 162 - 164 out of 435 pages.
the surface chart joining points of equal mean-sea-level pressure, the QFF. Question 584: The Bora is a A cold catabatic wind with the possibility of violent gusts B cold catabatic wind always associated with clouds and heavy showers C cold catabatic wind with gusts associated with a maritime air mass D squally warm catabatic wind which occurs mainly in summer Explanation: It is mainly winter, it is not associated with a maritime air mass or clouds and heavy showers. It is a strong, cold, northerly, Question 585: The range of wind speed in which radiation fog is most likely to form is: A below 5 kt B above 15 kt C between 10 and 15 kt D between 5 and 10 kt Explanation: NO Question 586: For a given airfield the QFE is 980 hPa and the QNH is 1000 hPa. The approximate elevation of the airfield is A 160 metres B 600 metres C 120 metres D 540 metres Explanation: 1000 –980 = 20hPa. 1hPa = 8 m. 20hPa x 8m = 160m Question 587: Which of the following factors have the greatest effect on the formation of the various types of ice on an aircraft ?
A Cloud temperature and droplet size B Aircraft speed and size of cloud droplets C Aircraft speed and curvature of the airfoil D Relative humidity inside the cloud Explanation: The type of ice (clear, rime or mixed) will be determined by the size of SCWD and the air temperature. Large droplets just below freezing will produce clear ice but as droplet size reduces and/or temperature gets lower the clear ice will become mixed with rime and then rime ice only will form. The amount of ice building up will depend on other factors such as the design and speed of the aircraft. Question 588: Hoar frost is most likely to form when A taking off from an airfield with a significant ground inversion (sky clear). B flying inside stratiform clouds. C flying in supercooled drizzle. D flying inside convective clouds. Explanation: With the airframe at a temperature below 0ºC when it climbs into warmer, moister air there will be sublimation and the formation of hoar frost. Question 589: Two aircraft, one with a sharp wing profile (S), and the other with a thick profile (T), are flying through the same cloud with same true airspeed. The cloud consists of small supercooled droplets. Which of the following statements is most correct concerning ice accretion ? A Aircraft S experiences more icing than T. B Aircraft S and T experience the same amount of icing C Neither of the aircraft accumulate ice due to the small size of droplets. D Aircraft T experiences more icing than S. Explanation: It is a fact that high performance profiles tend to accumulate ice easier and quicker than low performance aircraft. Question 590: While descending through a cloud cover at high level, a small amount of a white and rough powderlike contamination is detected along the leading edge of the wing. This contamination is called: A Rime ice.