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Question Bank
Questions for ICE ACCRETION
Answer the following questions
Test Mode
Training Mode
1. When fog freezes on parked aircraft it produces
Clear ice
Hoar Frost
Rime
2. Glazed ice is formed by freezing of _____ supercooled water droplets on airframe and aircraft is flying through clouds
Medium
Small
Large
3. CI, CS and CC clouds consist mostly ice crystals, Icing hazard is therefore
Negligible
Medium
Maximum
4. _____ occurs in St, Sc, Ac, Au, Cu, Ns at temperature -10 to -40°C and in Cb at temperature 20 to -40°C
Glazed
Rime
Hoar Frost
5. Rime is formed by freezing of ____ supercooled water droplets on airframe when air is flying through clouds
Small
Medium
Large
6. In clouds _____ occurs when a wide range of water drop sizes are present at temperatures between 0°C and -40°C
Glazed
Rime
Mixture of rime and clear ice
7. In AC clouds _____ icing is possible in mountainous areas
Moderate
Light
Severe
8. In CB icing may range from light to severe type up to -20°C level. Below this temperature severe icing is
significant
not significant
maximum
9. ______ 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
Hoar Frost
Glazed
Rime
10. In TCU icing may range from light to severe type at least up to _____ level
-40°C level
30°C level
-20°C level
11. Opaque Rime ice is
Solid
Light porous
Mixture of porous and solid
12. 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
30°C to - 10°C
13°C
20°C
13. Icing ____ the stalling speed appreciably
Does not increase/decrease
Increases
Decreases
14. 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
-20°C level
-15°C level
-25°C level
15. _____ 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
Glazed
Mixture of Rime and Clear ice
Rime
16. 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
Increases
Decreases
Does not change
17. The _____ ice poses serious aviation hazard
Rime
Hoar Frost
Glazed
18. Hoar frost occurs on airframe in clear air when the temperature of air frame is
frost point
below the frost point
just above the frost point
19. In clouds at temperatures below 0°C and aircraft may encounter icing of the type
only Glazed
only Rime
intermediate between those
20. AS, NS consist of supercooled water drops and ice crystals in varying proportion icing is possible
Light or moderate
Maximum
Negligible
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