greenjeep
Cause it's green, duh!
- Location
- Moab Local!
Mechanical aptitude test
- Thread starter greenjeep
- Start date
crimsonride
huh?
- Location
- Murray
From an engineering perspective that test is crap. Too many factors left out to accurately answer the questions and in many of the questions the true answers weren't even an option.
RockMonkey
Suddenly Enthusiastic
Cool test!
My results:
440 points
88%
If you click "review quiz" at the end (one of the icons in the upper right) you can see which ones you missed.
I missed the matching question about gear terms, had a brain fart and clicked the wrong one on the sun-gear question (I knew it, dammit!), and I was dead wrong on one of the pressure and one of the engine questions, and apparently I suck at figuring out complicated pulley arrangements...
My results:
440 points
88%
If you click "review quiz" at the end (one of the icons in the upper right) you can see which ones you missed.
I missed the matching question about gear terms, had a brain fart and clicked the wrong one on the sun-gear question (I knew it, dammit!), and I was dead wrong on one of the pressure and one of the engine questions, and apparently I suck at figuring out complicated pulley arrangements...
Jeremy
total tacoma points: 162
- Location
- MAGNA, land of chewy brown water
i missed all the electrical questions except the battery volt questions. and aperantly atmospheric presure forces air into the cylander.
who knew?
i missed the half the gear matching questions. i had the overdrive and reduction backwards.
who knew?i missed the half the gear matching questions. i had the overdrive and reduction backwards.
kowe69
wannabe
- Location
- West Valley, Utah
projektdotnet
Cruiserhead
- Location
- Layton
Well not being an engineer the fail didn't suprise me but how close I was to passing did.
370 Points
74%
370 Points
74%
- Location
- Smithfield Utah
These tests are actually kind of fun...
I had to take a test very similar to this to recieve my current job. Man it seems like only yesterday
I had to take a test very similar to this to recieve my current job. Man it seems like only yesterday
Spork
Tin Foil Hat Equipped
- Location
- Saratoga Springs, UT
88%
Missed the ring gear, Worm gear, one of the pulleys, the 3 light 2switch, the fan, and the piston.
I can live with it... the most mechanical part of my job is remembering what way to turn a screwdriver every couple of weeks.
Missed the ring gear, Worm gear, one of the pulleys, the 3 light 2switch, the fan, and the piston.
I can live with it... the most mechanical part of my job is remembering what way to turn a screwdriver every couple of weeks.
waynehartwig
www.jeeperman.com
- Location
- Mead, WA
I agree...I think the answer is wrong and backwards. The mixture is brought in because of the piston going down. If they piston going down, wasn't, then nothing would be brought into the engine. Now if it had a blower or turbo charger on it....
I passed as well. I missed the questions where it asked gear speeds - just not enough information to determine exactly what speed the dang thing is going. So I just chose a lower/higher number depending...
Spork
Tin Foil Hat Equipped
- Location
- Saratoga Springs, UT
I counted the teeth and was able to determine speed. most were either 10 tooth or 20 tooth gears. 10 tooth gear at 300rpm driving a 20 tooth gear would be 150rpm
waynehartwig
www.jeeperman.com
- Location
- Mead, WA
After a couple in, I thought about doing that, but...:-\
Here again...the blower or supercharger is just increasing the pressure in the intake manifold, so when it's exposed to a lower pressure area (inside the cylinder) it rushes in faster than it would at normal atmospheric pressure. Air always flows from a high pressure to a low pressure, but not because you "pull" it there.
I wish I could explain it better, but it's been nearly 20 years since my last Physics class when I would have really used the information.
Think about how a 2-stroke diesel works--there is no "suck" stroke on the piston, it cannot function without a turbo/supercharger to provide the difference in pressure to make the air flow.
waynehartwig
www.jeeperman.com
- Location
- Mead, WA
Here again...the blower or supercharger is just increasing the pressure in the intake manifold, so when it's exposed to a lower pressure area (inside the cylinder) it rushes in faster than it would at normal atmospheric pressure. Air always flows from a high pressure to a low pressure, but not because you "pull" it there.
I wish I could explain it better, but it's been nearly 20 years since my last Physics class when I would have really used the information.
Think about how a 2-stroke diesel works--there is no "suck" stroke on the piston, it cannot function without a turbo/supercharger to provide the difference in pressure to make the air flow.
I kind of understand what your saying....
Tacoma
Et incurventur ante non
- Location
- far enough away
Carl is right. There is no such thing as suction.
if the answer to the qestion was "atmouspheric pressure" the engine would work whether the piston was moving or not, the action of the piston moving down increasing the volume without increasing the amount of gas in the cylinder, creating a negative displacement compared to atmouspheric pressure - when the valve opens the transfer from high pressure to low pressure is suction/vacuum. The answers are too vague for the question, because without the piston moving it wouldn't matter what atmouspheric pressure was.
4554x4
always modifing something
- Location
- Sandy Utah
i missed all the electrical questions except the battery volt questions. and aperantly atmospheric presure forces air into the cylander.
i missed the half the gear matching questions. i had the overdrive and reduction backwards.
trick question. if your rings were bad, there would be no ''suction'' from the piston going down, thus no unequal atmospheric pressure. i think you need both suction and atmospheric pressure to make it work. next time your engine is running, put your hand over the carb, thus sealing it off. you will feel the vacuum from the pistons but you wont feel atmospheric pressure pushing your hand inside. I also sucked at the gear questions. the only practical use i could think of for these questions would be if you were to designing a trans. having has a few transmissions apart, if i wanted to see the rotation, i would just turn the gears. The electrical questions went easy for me though. They were just like what you might be asked on an ASE test. It was an interesting quiz though, made me think.
Last edited:
waynehartwig
www.jeeperman.com
- Location
- Mead, WA
Thank you - that's my point MUCH better explained!
It would be like saying as soon as the valve opened, the piston went down and that just doesn't happen in a normaly asperated motor.I think the test is a good one, but some of the questions need some polishing.
RockMonkey
Suddenly Enthusiastic
Believe it or not, that force you feel with your hand on the carb IS the atmospheric pressure pushing down on your hand. You don't normally feel it because your whole body is normally experiencing the same pressure, but when you lower the pressure on one part of your body (in this case your hand) you will feel the pressure pushing down on it.