I will check tomorrow probably Alex, regarding the Moderate/severe.
What about this question?
At constant RPM with a normally aspirated engine and a fixed pitch propeller, as altitude increases, if the mixture is not leaned:
The density of air entering the carburettor decreases and the fuel flow increases. INCORRECT.
Both the density of air entering the carburettor and the fuel flow decrease. CORRECT
Why are they considering that fuel flow will decrease?