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For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.

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+1 vote
in Machine Dynamics by (34.3k points)
For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.

(a) Work is done by the gases

(b) Work is done on the gases

(c) Work is done on the piston wall

(d) Work is done by the piston wall

The question was asked in semester exam.

Asked question is from Turning Moment Diagram for a Multicylinder Engine topic in chapter Turning Moment Diagrams and Flywheel of Machine Dynamics

1 Answer

0 votes
by (38.6k points)
Correct option is (a) Work is done by the gases

To explain: When the pressure inside the cylinders exceeds the atmospheric pressure then the area under the loop is positive. This indicates that the work is done by the gases.

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