18. Engines

Question 1

In an internal combustion engine, the ratio of air to fuel is correct in the full rich position only at:

Answer 1

Sea level.

Question 2

As an airplane climbs, the fuel air mixture becomes:

Answer 2

Richer

Question 3

A mixture that is set too rich:

Answer 3

Will create spark plug fouling.

Question 4

For best economy, lean the mixture to peak EGT and:

Answer 4

Leave it set at peak EGT.

Question 5

The mixture must be reset whenever you change:

Answer 5

Altitude or power.

Question 6

How do you set the mixture if your airplane has no EGT?

Answer 6

Lean till the engine runs roughly and then enrich until the engine runs smoothly again.

Question 7

Detonation occurs when:

Answer 7

There is an explosive ignition of the fuel/air mixture within the cylinder’s combustion chamber.

Question 8

Preignition occurs when:

Answer 8

The fuel/air mixture ignites prior to the engine’s normal ignition point.

Question 9

The most reliable indicator of preignition is:

Answer 9

Loss of power.