Question Bank

1. 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

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

3. When fog freezes on parked aircraft it produces

4. Opaque Rime ice is

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

6. 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

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

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

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

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

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

12. ______ 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

13. The _____ ice poses serious aviation hazard

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

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

16. Icing ____ the stalling speed appreciably

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

18. 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

19. _____ 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

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