carburettor

#20. An overly rich mixture at slow running could be caused by:

• AThe priming pump being left open.
• BLow fuel pressure.
• CThe float chamber level being too low.
• DA partially blocked main jet.

#5. The venturi in the carburettor choke tube creates:

• AA positive pressure over the discharge nozzle.
• BA depression over the fuel discharge nozzle.
• CA positive pressure at the throttle valve.
• DA decrease in the velocity of the air entering the engine.

#1. The pressure in the induction manifold of a normally aspirated engine:

• ARemains constant as the throttle is opened.
• BDecreases as the throttle is opened.
• CInitially increases as the throttle is opened but decreases after approximately the half open position.
• DIncreases as the throttle is opened.