Question

During which stroke of a four-stroke internal combustion engine is work done by the system of gases?

A. Intake stroke
B. Power stroke
C. Compression stroke
D. Exhaust stroke

Answer 1

@Dragondd320 Help please!

Answer 2

@Australopithecus Help please!

Answer 3

I am pretty sure this is just a rewording of the last question. Because the work done in a four-stroke engine by the gases comes in during the power stroke, as the combustion of those gases is what forces the piston back up.

Answer 4

If it said "which is the stroke where work is done ON the system of gases" , the answer would most likely be compression. But I am pretty sure this is just a rewording of the previous question.

Answer 5

Something that may help you visualize the problem or assist in later questions is this: https://www.grc.nasa.gov/WWW/k-12/airplane/engopt.html

Answer 6

So you think the answer is B?

Answer 7

Yes

Answer 8

Thank you!