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× Welcome to the CPL AGK question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.

EXERCISE GK1/39

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adambernhardt created the topic: EXERCISE GK1/39

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

Keen for some guruness here.
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bobtait replied the topic: EXERCISE GK1/39

The wording you have indicated is not the same as that of the question in the book. Choice (b) in the book says.

"the inlet valve closes during the compression stroke and the exhaust valve opens during the power stroke"

That is the correct answer.
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adambernhardt replied the topic: EXERCISE GK1/39

Hi Bob

Thats not the question in my book
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bobtait replied the topic: EXERCISE GK1/39

That's odd. Thanks for your feed-back. It is appreciated.

Bob
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adambernhardt replied the topic: EXERCISE GK1/39

Yes, weird. Thanks for the clarification.
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