14. Icing

Jose Antonio Vazquez
Quiz by Jose Antonio Vazquez, updated more than 1 year ago
Jose Antonio Vazquez
Created by Jose Antonio Vazquez over 2 years ago
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Meteo Quiz on 14. Icing, created by Jose Antonio Vazquez on 01/12/2018.
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Resource summary

Question 1

Question
1- At temperatures of between 0oC and -10oC clouds consist of:
Answer
  • Entirely water droplets.
  • Entirely ice crystals.
  • Mostly water vapour.
  • Mostly supercooled water droplets and a few ice crystals.

Question 2

Question
2- Turbulent clouds are most serious from the icing standpoint because:
Answer
  • Strong vertical currents mean that a predominance of large supercooled water droplets will be present.
  • Strong vertical currents mean that a predominance of small supercooled water droplets will be present.
  • Turbulent clouds produce hail which sticks to the aircraft.
  • Turbulent clouds indicate a low freezing level.

Question 3

Question
3- Hoar frost forms on an aircraft when:
Answer
  • The aircraft suddenly enters a cloud at below freezing temperature.
  • he aircraft in sub zero clear air suddenly enters a colder region.
  • The aircraft in sub zero clear air suddenly enters a warmer moist region.
  • The aircraft suddenly enters a cloud which is at higher temperature than the surrounding air.

Question 4

Question
4- Stratus cloud of limited depth at a temperature of -5o C will most likely give:
Answer
  • Moderate to heavy rime ice.
  • Moderate to heavy glaze ice.
  • Light to moderate rime ice.
  • Light to moderate glaze ice.

Question 5

Question
5- Most cases of serious piston engine icing occur in cloud, fog, or precipitation with a temperature range between:
Answer
  • - 10ºC to +25ºC
  • -18ºC to +5ºC
  • -10ºC to 0ºC
  • -20ºC to +15ºC

Question 6

Question
6- Clear ice forms as a result of:
Answer
  • Large supercooled water droplets spreading as they freeze.
  • Ice pellets splattering on the aircraft.
  • Small supercooled water droplets splashing over the aircraft.
  • Water vapur freezing to the aircraft.

Question 7

Question
7- Orographic uplift in stable conditions gives a strong vertical component to air movement thus supporting larger supercooled droplets in orographically formed cloud. Consideration should also be given to the fact that in this cloud:
Answer
  • The 0ºC isotherm will be higher.
  • The 0ºC isotherm will be lower.
  • The lapse rate will be isothermal.
  • An inversion can be anti-cyclonic.

Question 8

Question
8- Carburettor icing is unlikely:
Answer
  • In cloud.
  • At temperatures between -10oC and -30oC.
  • In clear air.
  • When the RH is 60%.

Question 9

Question
9- Flying 50 nm ahead of a warm front out of cloud at 1000 ft in winter, with an ambient temperature of -8oC, there is a strong risk of:
Answer
  • Hoar frost.
  • Rime icing and carburettor icing.
  • Structure damage caused by hail.
  • Clear ice in the form of rain ice.

Question 10

Question
10- In AS cloud at FL 170 and a temperature of -20oC the airframe icing most likely to be experienced is:
Answer
  • Moderate clear icing.
  • Light rime icing.
  • Hoar frost.
  • Severe clear icing.
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