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During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber,

Aboth the intake and exhaust valves are closed.
Bboth the intake and exhaust valves are open.
Cthe exhaust valve is open and the intake valve is closed.
Dthe intake valve is open and the exhaust valve is closed.

Verified Answer :

AL2006


The piston rises and compresses the fuel in the cylinder during
the "compression" stroke. 

Both valves have to closed in order to compress the fuel in there. 

If either valve were open, just a crack, then the gases wouldn't get
as compressed as they should ... they'd just get forced out into the
fuel line or the exhaust line through the open valve.

smpurvis

your answer is a. both the intake and exhaust valves are closed.

i just took the test

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