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Having reviewed the question and answers in the above mentioned review questions, can i get a review of the question please.
GK1/39 - During the COMPRESSION and POWER strokes on the 4 cycle engine, on a HO engine
a. The exhaust valve remains closed.
b. both inlet valves remain open.
c. the inlet valve closes.
d. both valves remain open.
So my thinking here is;
a is correct IF we're talking about compression but as it opens on the power stroke, not the most correct.
b is what the answer keys indicates as correct (videos show during the compression stroke the inlet valve closing as the piston leaves BDC and is closed on the power stroke, )
c. the inlet valve is ALREADY closed as the compression stroke starts
d. inlet is closed and exhaust is opening
Looks like C should be the right answer.
I picked (c) then changed it to (a) as in my mind (b) and (d) arent correct