Piston Engines - Carburettors: DGCA Technical General questions

Question 1

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

Accepted Answer

increases as the throttle is opened

Answer

remains constant as the throttle is opened

Answer

decreases as the throttle is opened

Answer

initially increases as the throttle is opened but decreases after approximately the half open position

Question 2

Excessive cylinder head temperatures are caused by:

Accepted Answer

the prolonged use of weak mixtures

Answer

the ignition timing being too far advanced

Answer

the prolonged use of rich mixture

Answer

the ignition being too far retarded

Question 3

The primary function of a diffuser in a carburettor is to:

Accepted Answer

control the mixture strength over part of the engine speed range

Answer

vent air from the float chamber

Answer

emulsify the fuel during engine acceleration

Answer

enable adjustment of the engine slow running speed

Question 4

A possible cause of the engine backfiring could be:

Accepted Answer

an exhaust valve sticking open

Answer

a broken push rod

Answer

a blocked float chamber

Answer

a sticking inlet valve

Question 5

A fuel strainer should be fitted:

Accepted Answer

before the main jet

Answer

in the inlet manifold

Answer

at the air intake

Answer

after the main jet

15 more questions in this chapter, free with an account