CPL Acft Tech - Carburation

The job of a carburetor is to.... (select all of the correct answers)

• mix the fuel and air at the correct ratio

• atmomise the fuel

• ignite the fuel-air mixture

• allow the burnt fuel-air mixture to enter the exhaust

What is one disadvantage peculiar to float type carburetors

• airframe icing

• fuel flow being disturbed by negative 'g' manoeuvres

• prone to vapour locking

• injector nozzles are easily blocked

The Chemically Correct Mixture (CCM) ratio of Fuel to AIr is

• 1:15

• 15:1

• 12:1

• 1:12

Normal working limits for Fuel to Air ratio are

• 1:9 to 1:18

• 1:8 to 1:20

• 1:5 to 1:15

• 1:12 to 1: 20

The fuel to air ratio for maximum power is found at about

• 1:12

• 1:16

• 1:15

• 1:9

The fuel to air ratio for best economy is found at about

• 1:12

• 1:16

• 1:15

• 1:9

What are the conditions most likely to lead to detonation

• High power setting and a lean mixture

• High power setting and a rich mixture

• Low power setting and a lean mixture

• Low power setting and a rich mixture

The main fuel outlet of the carburetor is located in

• the carburetor heat box inlet

• the centre of the carburetor venturi

• the intake manifold

• the fuel injection manifold

To supply extra fuel during increases in engine power (that is, when the throttle is advanced), what does a carburetor have?

• an accelerating system

• a power enrichment system

• a float valve

• a mixture control

TRUE or FALSE

To correctly lean the mixture of an aircraft engine, the mixture control should be moved slowly towards the lean position. As the chemically correct mixture is found, the RPM of a fixed pitch propeller will increase.

• True

• False