Question Bank

1. 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

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. Icing ____ the stalling speed appreciably

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

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

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

7. ______ 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

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

9. The _____ ice poses serious aviation hazard

10. When fog freezes on parked aircraft it produces

11. 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

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

13. _____ 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

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

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

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

17. Opaque Rime ice is

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

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

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