Question

What does scavenging air mean?

(a) Burnt air containing combustion products

(b) Air sent under compression

(c) Forced air for cooling the engine cylinder

(d) Air used for forcing the burnt gases out of cylinder during the exhaust period

This question was posed to me in final exam.

Asked question is from Engine Performance Characteristics in division Measurements and Testing/Performance Parameters and Characteristics of IC Engine

Answer 1

The correct answer is:

(d) Air used for forcing the burnt gases out of the cylinder during the exhaust period

Scavenging air refers to the fresh air or fuel-air mixture used in two-stroke engines to force the burnt gases out of the cylinder during the exhaust period. The purpose of scavenging is to clear the cylinder of exhaust gases, making room for a fresh charge of fuel and air for the next combustion cycle. Effective scavenging helps improve engine efficiency and performance.