ICE ACCRETION – Air – DGCA Question Bank For Politics

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

below the frost point

frost point

just above the frost point

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

only Glazed

only Rime

intermediate between those

#3. Opaque Rime ice is

Light porous

Solid

Mixture of porous and solid

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

Small

Large

Medium

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

Small

Large

Medium

#6. The _____ ice poses serious aviation hazard

Rime

Hoar Frost

Glazed

#7. 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

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

Maximum

Medium

Negligible

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

Maximum

Light or moderate

Negligible

#10. In AC clouds _____ icing is possible in mountainous areas.

Light

Moderate

Severe

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

-40°C level

30°C level

-20°C level

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

not significant

significant

maximum

#13. 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.

-25°C level

-20°C level

-15°C level

#14. 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.

13°C

30°C to - 10°C

20°C

#15. ______ 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.

Rime

Glazed

Hoar Frost

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

Rime

Glazed

Hoar Frost

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

Rime

Glazed

Mixture of rime and clear ice

#18. _____ 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

Rime

Mixture of Rime and Clear ice

#19. When fog freezes on parked aircraft it produces

Hoar Frost

Rime

Clear ice

#20. Icing ____ the stalling speed appreciably

Decreases

Increases

Does not increase/decrease

Dgca Question Bank For Pilots

Results

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

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

#3. Opaque Rime ice is

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

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

#6. The _____ ice poses serious aviation hazard

#7. 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

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

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

#10. In AC clouds _____ icing is possible in mountainous areas.

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

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

#13. 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.

#14. 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.

#15. ______ 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.

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

#18. _____ 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.

#19. When fog freezes on parked aircraft it produces

#20. Icing ____ the stalling speed appreciably