Question

the _________ effect occurs when the exhaust gases moving out of the combustion chamber create a low - pressure area in the exhaust manifold, helping to pull air and fuel into the cylinder.

a. exhaust
b. pulse
c. scavenging
d. manifold

Explanation:

The pulse effect in an engine occurs when exhaust gases moving out create a low - pressure area. This low - pressure area helps in pulling air and fuel into the cylinder. Exhaust is a general term for the gases expelled. Scavenging is the process of removing exhaust gases. Manifold is a component (exhaust manifold in this case). The key description in the question matches the pulse effect.

Answer:

B. Pulse