Thread: Try not to laugh too hard - am doing mechanics course ...

For the first one, I agree with the marker. You answer doesn't say what you were thinking.

For the second one, I think that you are correct. If it said the vehicle was to be driven on the road then I think the marker would be correct.

The complete cycle is 720 degrees or two rotations of a crankshaft, each stroke can only be a maximum of 180 degrees, hence two up and two down movements.

But you weren't supposed to say that you were thinking, it was multiple choice, can you explain more fully for me please, I don't get it ...

Originally Posted by Slunnie

For the first one, I agree with the marker. You answer doesn't say what you were thinking.

For the second one, I think that you are correct. If it said the vehicle was to be driven on the road then I think the marker would be correct.

Originally Posted by B92 8NW

The complete cycle is 720 degrees or two rotations of a crankshaft, each stroke can only be a maximum of 180 degrees, hence two up and two down movements.

Huh? Could you please give more info.

you dont need a VIN plate to legally own/register/drive a vehicle

quite a few cars have been stolen and recovered with VIN plates either stolen or mutilated, and have had a surrogate VIN issued to them, no plate, just stamped on the block and body

a four stroke engine completes a cycle with 2 revolutions of the engine.

the first rotation comprises of the intake and compression strokes (down then up) the second rotation comprises of the power and exhuast strokes (down then up again)

what you have confused is the definitions of cycle, rotations and strokes.

the cycle is typically defined as being from TDC ready for intake to TDC ready for intake.

In a verbose multiple choice assessment 1 answer will be stupidly wrong so can be discounted, 1 will have the correct term(s) but will either be incorrectly sequenced or numbered, 1 answer will have the correct numbers and sequence but the wrong term(s) and the last will usually be the correct answer unless its a 5 choice answer in which case the last answer will either be all are correct or none are correct.



the true false one is a dicey one, I got it wrong as well but prooved that I was correct by asking them to show me the VIN Plate on a registered series II landy that was on base.

However.

the test was written with only current ADR's in mind and their answer, on that basis, is the correct one. You can't legally register a car without a VIN plate and a vehicle that cant be registered cant be driven (so long as you obey the law) which is what the question is inferring but not what is written (assuming youve quoted the question and not paraphrased).

If you got a pass dont get twisted around the axles about it, If its the difference between a pass/fail then its worth asking the questions about.

I always remember it as Suck, squeeze, bang, blow.


Car Bibles : The Fuel and Engine Bible

Thanks Dave, got it now. They were the only questions I got wrong out of 20, so I guess that's not too bad. Just annoyed me I thought I got them right, & couldn't fathom why I got them wrong. (Christ, it's been a long day!) Not looking forward to the next assignment though, all about fasteners, wrenches, precision measuring tools, tool identification & use ... that's going to be somewhat hard to learn from a book ...

Originally Posted by Blknight.aus

a four stroke engine completes a cycle with 2 revolutions of the engine.

the first rotation comprises of the intake and compression strokes (down then up) the second rotation comprises of the power and exhuast strokes (down then up again)

what you have confused is the definitions of cycle, rotations and strokes.

the cycle is typically defined as being from TDC ready for intake to TDC ready for intake.

In a verbose multiple choice assessment 1 answer will be stupidly wrong so can be discounted, 1 will have the correct term(s) but will either be incorrectly sequenced or numbered, 1 answer will have the correct numbers and sequence but the wrong term(s) and the last will usually be the correct answer unless its a 5 choice answer in which case the last answer will either be all are correct or none are correct.



the true false one is a dicey one, I got it wrong as well but prooved that I was correct by asking them to show me the VIN Plate on a registered series II landy that was on base.

However.

the test was written with only current ADR's in mind and their answer, on that basis, is the correct one. You can't legally register a car without a VIN plate and a vehicle that cant be registered cant be driven (so long as you obey the law) which is what the question is inferring but not what is written (assuming youve quoted the question and not paraphrased).

If you got a pass dont get twisted around the axles about it, If its the difference between a pass/fail then its worth asking the questions about.

They have these questions just to mess with your head. I find it easier to remember strokes by the amount of times at TDC and BDC per cycle. For a 4 stroke it has 2 TDC moments and 2 BDC moments.

I'd argue though. Considering there is 4 strokes: "one cycle consists of four up and down increments of the piston." is still correct.

One cycle consists of four up and four down increments of the piston - would be incorrect. By linking up and down with and means there's room for interpretation. This is all based on my understanding of the word increment...(which I believe is a change in state). English was never my strong suit.

If you passed, run with it...in the end, you know it. Whether the teacher is an idiot or not...? You know that too ;-)!