Carburettor

Question 1

Impact ice

Answer 1

Water droplets in the atmosphere coming into contact with engine parts below 0*c

Question 2

Fuel ice/refrigeration ice

Answer 2

Cooling effect on water droplets of fuel evaporation after induction into the airstream

Question 3

Throttle ice

Answer 3

Freezing of water droplets at or near the throttle - can completely jam the throttle

Question 4

Symptoms of carb icing

Answer 4

Low CHT
Rough running 
Loss of power 
Drop in RPM (fixed pitch props only)
Drop in MAP (constant speed props)

Question 5

Carb heat

Answer 5

Hot air from the exhaust is run through the carburettor

Reduces the RPM of the engine due to the less dense air

Apply for 20-30 secs only

Question 6

Diffuser - carb

Answer 6

Prevents rich cut

Increases the amount of air mixing with the fuel - decreases the amount of fuel in the engine

Maintains a correct mixture across a wide speed range