Chapter 5, Problem 31R

To determine

To state: the phase in which hot gases are expelled out of a four-stroke engine.

Explanation of Solution

Introduction:

A device that converts thermal energy into mechanical energy utilizing some chemical energy in it is called a heat engine. An example of this engine is a car’s engine.

All heated engines contain an internal combustion engine that burns fuel inside a set of cylinders. Each cylinder consists of a piston which continues moving up and down. These upward and downward movements of pistons are called a stroke. The automobiles repeat four strokes in one cycle. These four strokes are classified into the following as per their function: intake, compression, power and exhaust strokes respectively. So in the last phase of each cycle, the hot gases formed in the engine are expelled out which is called the exhaust stroke.

Conclusion:

Out of the four phases of a four-stroke engine, the waste gases are removed in the exhaust stroke.