Asked by John

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

A.
Power stroke

B.
Intake stroke

C.
Compression stroke

D.
Exhaust stroke

It isn't C because work is done to and not by
Answered by John
It isnt C. I have already tried it. It would only be C If the question said work done to and not by. Like you said compression requires work, means work done to, not by
Answered by DrBob222
The intake pulls fuel into the cylinder. The exhaust stroke lets the gases out. The compression stroke takes the gases from the intake stroke and compresses them. Then the power stroke propels the piston to the other end of the cylinder and pushes the connection rod which is connected to the drive shaft and that is connected to the wheels. Which one does work by the system to the car/truck/whatever?
Answered by John
Would it be power stroke because it uses the gases to propel?
Answered by DrBob222
That's what I would go with.
Answered by Anony.mous
Compression stroke
I just took the test on apex
Answered by Blicky
I actually just took the quiz for AP Chem on APEX and compression was wrong, maybe try what John says and choose power stroke
Answered by David
Answer is A
Answered by Jay
A is correct here, I'd bet my best pair of pants on it
Answered by madsab
IT is A for Apex
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