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312 - FAA PPL(A) USA - As you are climbing to your cruise altitude, you realize you forgot to lean the mixture control. What happens to fuel/air mixture entering the engine?

Question 312 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

Altitude has no effect on the fuel/air mixture in modern airplane engines
The fuel-air mixture is leaner because the density of air increases while the amount of fuel remains constant
The fuel-air mixture becomes richer because the density of air decreases while the amount of fuel remains constant

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane