MIXTURE – Air – DGCA Question Bank For Politics

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

Decrease.

Increase initially, but decrease below take off power.

Increase.

Be unaffected by altitude increase.

#2. For maximum endurance the mixture control should be set to:

Weak.

The chemically correct state.

Between rich and weak.

Rich.

#3. An air/fuel ratio of 9:1 would be considered:

Chemically correct.

Extravagant.

Rich.

Weak.

#4. Because of the reduction in the density of the atmosphere associated with an increase in altitude:

The mixture control must be moved towards the weak position.

The throttle must close progressively to maintain the best air/fuel ratio.

The mixture must be progressively richened to compensate for the power loss.

The octane rating of the fuel must be increased.

#5. A chemically correct mixture is:

15:1 (fuel : air)

15:1 (air : fuel)

13:1 (fuel : air)

13:1 (air : fuel)

#6. While weakening the mixture from the chemically correct mixture the EGT will __ and the cylinder head temperature will _ with a _____ in Thermal efficiency.

Increase increase decrease

Decrease increase decrease

Decrease increase increase

Increase increase increase

#7. Which of the following mixtures theoretically would produce the maximum RPM?

14:1 (air : fuel)

14:1 (fuel : air)

15:1 (fuel : air)

15:1 (air : fuel)

#8. A weak mixture is used for which of the following?

take off

climbing

engine starting

cruising

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

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

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

The ignition may have to be advanced.

The ignition may have to be retarded.

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

The charge would burn slower.

All of the fuel would be used during combustion.

All of the oxygen would be used during combustion.

Cylinder head temperature increases while richening further.

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