CPL » Air Tech (A) » Carburation

26.12 Carburation

26.12.2 Explain the basic principle of operation of a simple float-type carburettor.

26.12.4 Explain the following in relation to fuel-air mixture ratios:

(a) rich and lean;

(b) normal workable mixture ratio limits;

(c) the chemically correct or stoichiometric ratio;

(d) the approximate ratios for maximum power output and best economy.

26.12.6 Describe a typical carburettor mixture setting curve and the operating area where detonation will occur.

26.12.8 Explain the need for the following in an aero-engine carburetor;

(a) a venturi;

(b) atomization and diffusion;

(c) an accelerating system;

(d) an idling system;

(e) a power enrichment (economizer) system;

(f) a mixture control;

(g) a cut-off system.

26.12.10 Explain the disadvantages of a float type carburettor in an aero-engine.

26.12.12 Explain the correct use of the mixture control.

26.12.14 Explain the consequences of operating with over-rich and over-lean mixture settings.