Results
Q1. The pressure in the induction manifold of a normally aspirated engine:
Correct answer is – increases as the throttle is opened
Q2. The purpose of an accelerator pump is to:
Correct answer is – prevent a weak cut when the throttle lever is advanced rapidly
Q3. The fuel flow to a piston engine will vary according to:
Correct answer is – the rpm, the throttle position and the mixture setting
Q4. The primary function of a diffuser in a carburettor is to:
Correct answer is – control the mixture strength over part of the engine speed range
Q5. The Venturi in the carburettor choke tube creates:
Correct answer is – a depression over the fuel discharge nozzle
Q6. The fuel priming pump supplies fuel directly to:
Correct answer is – the induction manifold
Q7. A weak mixture would be indicated by:
Correct answer is – a drop in engine speed
Q8. The presence of an engine driven fuel pump on an engine fitted with a carburettor:
Correct answer is – ensures a positive flow of fuel to the carburettor float chamber
Q9. It would normally be considered dangerous to pump the throttle lever when starting an engine because:
Correct answer is – it could increase the risk of fire in the carburettor air intake
Q10. A typical air/fuel ratio for normal engine operation would be:
Correct answer is – 12 parts of air to one of fuel by weight
Q11. Excessive cylinder head temperatures are caused by:
Correct answer is – the prolonged use of weak mixtures
Q12. The mixture supplied by the carburettor to the engine is said to be weak when:
Correct answer is – the proportion of air in the mixture is greater than that needed for full combustion of the fuel
Q13. In an attempt to maintain the correct air/fuel ratio while climbing into the decreased density air of higher altitude:
Correct answer is – a mixture control is used
Q14. The greater the weight of combustible mixture in the cylinders:
Correct answer is – the greater the power developed by the engine
Q15. A rich mixture is supplied to the cylinders at take-off and climb:
Correct answer is – to cool the charge temperature and prevent detonation
Q16. A fuel strainer should be fitted:
Correct answer is – before the main jet
Q17. The correct air/fuel ratio for an engine running at idle is:
Correct answer is – rich
Q18. The method of priming an engine not fitted with a priming pump is to:
Correct answer is – pump the throttle several times
Q19. A possible cause of the engine backfiring could be:
Correct answer is – an exhaust valve sticking open
Q20. An overly rich mixture at slow running could be caused by:
Correct answer is – the priming pump being left open
