MET Q12 - Icing

Question 1

Ice can form…

Select one:

a.Outside clouds only

b.All of the above

c.In precipitation only

d.Inside clouds only

Answer 1

b.All of the above

Question 2

The most hazardous form of precipitation associated with a warm front would be…

Select one:

a.Continuous drizzle

b.Moderate rain showers

c.Freezing rain

d.Hail showers

Answer 2

c.Freezing rain

Question 3

Flying in cloud, at which temperatures would an aircraft be most likely to experience clear ice accumulation?

Select one:

a.0 to -15 degrees

b.zero to -40 degrees

c.-5 to -10 degrees

d.+4 to -5 degrees

Answer 3

a.0 to -15 degrees

Question 4

With the freezing level at 5000ft, at which FL is an aircraft most likely to encounter the greatest concentration of large super cooled water droplets?

Select one:

a.L060

b.FL040

c.FL100

d.FL180

Answer 4

a.L060

Question 5

What causes large super cooled water droplets to spread during the freezing process?

Select one:

a.The shape of the aerofoil

b.The release of latent heat

c.The speed at which the air passes over the aerofoil

d.The low level of atmospheric pressure

Answer 5

b.The release of latent heat

Question 6

Which type of cloud has the greater ratio of super cooled water droplets to ice crystals?

Select one:

a.Stratus

b.None of the above

c.Cumulus

d.Cirrus

Answer 6

a.Stratus

Question 7

Two aircraft, one with a sharp wing profile (S), and the other with a thick profile (T), are flying through the same cloud with same true airspeed. The cloud consists of small super cooled droplets. Which of the following statements is most correct concerning ice accretion?

Select one:

a.Neither of the aircraft accumulates ice due to the small size of droplets

b.Aircraft T experiences more icing than S.

c.Aircraft S experiences more icing than T

d.Aircraft S and T experience the same amount of icing

Answer 7

c.Aircraft S experiences more icing than T

Question 8

Orographic lifting can cause the level of ice accretion to go from:
Select one:

a.MOD to SEV

b.MOD to LIGHT

c.SEV to MOD

d.SEV to TRACE

Answer 8

a.MOD to SEV

Question 9

You are flying with an outside air temperature of -12°C and a TAS of 250kts, at FL150 through 8 oktas NS. What type and degree of icing is most probable?

Select one:

a.Just clear ice

b.Just rime ice

c.No ice

d.Moderate to severe mixed ice.

Answer 9

d.Moderate to severe mixed ice.

Question 10

A small super cooled cloud droplet that collides with an aerofoil will most likely

Select one:

a.Travel back over the wing, creating clear ice.

b.Freeze immediately and create clear ice.

c.Freeze immediately and create rime ice

d.Travel back over the wing, creating rime ice.

Answer 10

c.Freeze immediately and create rime ice

Question 11

Clear ice is dangerous because it

Select one:

a.Is translucent and only forms at the leading edges

b.Is not translucent and forms at the leading edges

c.Is heavy and is difficult to remove from the aircraft surfaces

d.Spreads out and contains many air particles

Answer 11

c.Is heavy and is difficult to remove from the aircraft surfaces

Question 12

What level of icing can you expect with an As and Cu cloud?

Select one:

a.As: LIGHT to MOD /Cu: NIL to TRACE

b.As: LIGHT to MOD / Cu: MOD to SEV

c.As: NIL to TRACE / Cu: MOD to SEV

d.As: MOD to SEV / Cu: LIGHT to MOD

Answer 12

b.As: LIGHT to MOD / Cu: MOD to SEV