Question Bank

1. CI, CS and CC clouds consist mostly ice crystals, Icing hazard is therefore

2. Liquid water content is an important factor in icing. As the maximum water concentration is around ______ , maximum ice formation in clouds may also be expected around the level

3. In clouds at temperatures below 0°C and aircraft may encounter icing of the type

4. Glazed ice is formed by freezing of _____ supercooled water droplets on airframe and aircraft is flying through clouds

5. Hoar frost occurs on airframe in clear air when the temperature of air frame is

6. _____ occurs in AS, NS, AC and towering CU or CB between 0°C and -20°C, in warm front below 0°C, especially if the aircraft has rapidly descended from a colder region

7. In clouds _____ occurs when a wide range of water drop sizes are present at temperatures between 0°C and -40°C

8. In AC clouds _____ icing is possible in mountainous areas

9. AS, NS consist of supercooled water drops and ice crystals in varying proportion icing is possible

10. Rime is formed by freezing of ____ supercooled water droplets on airframe when air is flying through clouds

11. Opaque Rime ice is

12. Icing ____ the stalling speed appreciably

13. Airframe icing occurs below 0°C. Its probability of occurrence decreases progressively to -20°C, as at lower temperatures the proportion of super-cooled water drops in a cloud

14. In CB icing may range from light to severe type up to -20°C level. Below this temperature severe icing is

15. The _____ ice poses serious aviation hazard

16. _____ occurs in St, Sc, Ac, Au, Cu, Ns at temperature -10 to -40°C and in Cb at temperature 20 to -40°C

17. Carburetor icing occurs when air from intake passes through a ventury (choke) and causes expansional cooling and vaporization of fuel. Serious icing can occur can occur at extreme temperatures

18. When fog freezes on parked aircraft it produces

19. ______ occurs in a moist cloudless air on an aircraft surface having temp, below 0°C, due to sublimation of water vapour onto feathery ice crystals

20. In TCU icing may range from light to severe type at least up to _____ level