Piston Engines - Mixture: DGCA Technical General questions

Question 1

While using a rich mixture which of the following would be a correct statement?

Accepted Answer

All of the oxygen would be used during combustion

Answer

The charge would burn slower

Answer

All of the fuel would be used during combustion

Answer

Cylinder head temperature increases while richening further

Question 2

For maximum endurance the mixture control should be set to:

Accepted Answer

weak

Answer

the chemically correct state

Answer

between rich and weak

Answer

rich

Question 3

A chemically correct mixture is:

Accepted Answer

15:1 air : fuel

Answer

15:1 fuel : air

Answer

13:1 fuel : air

Answer

13:1 air : fuel

Question 4

Weakening the mixture below the best fuel/air ratio will cause the engine power to:

Accepted Answer

decrease

Answer

increase initially, but decrease below take off power

Answer

increase

Answer

be unaffected by altitude increase

Question 5

While using a weak mixture which of the following would be an incorrect statement?

Accepted Answer

The ignition may have to be retarded

Answer

The charge would be cooled due to a larger proportion of nitrogen in the cylinder

Answer

The charge would burn slower due to a larger proportion of nitrogen in the cylinder

Answer

The ignition may have to be advanced

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