Mechanical aptitude "test"

[Azuremen]

Wouldn’t that be heat dynamics and fluid transfer?

No, fluid dynamics and heat transfer is correct.

Heat Dynamics would make no sense, as heat is just a measure of energy the molecules of object x, and studies around it just look at the transfer of said energy.

Fluids on the other hand are quite interesting, if not terrifying sometimes

 

[guska]

94%

15, 17 and 48

 

[Metar]

Why is everyone getting low grades?

Because the harder questions come a bit later...

 

[Blake]

No, fluid dynamics and heat transfer is correct.

Heat Dynamics would make no sense, as heat is just a measure of energy the molecules of object x, and studies around it just look at the transfer of said energy.

Fluids on the other hand are quite interesting, if not terrifying sometimes

Yeah, joke based on the words fluid transfer. You fail.

 

[Leonidae]

68%/340 points. I must start paying more attention at school.. but this really isn't my fault, the teacher who was responsible of us for first two years was bitter old fart who didn't care..

 

[DustDriver]

Yay, 86% with 430 points.
I guess the 3 years of industrial science in high school helped

edit: i clicked on the wrong answer for #11, but i knew he right one
failed at some of the lifting weight question (16 and further)
+ the fan question
+ the compressing of air. i should have known that

and i agree at question 48 that their answer is wrong. (or at least not complete)

 

[CDailey]

66% Apparently I got a lot more right than I thought I would.

 

[Azuremen]

Yeah, joke based on the words fluid transfer. You fail.

Apparently, I do

 

[TheCracker]

74% - it's a long time since i did physics at school!

 

[Danoff]

96%

I misunderstood the lousy diagram for question 47, and I think their answer for number 48 is dead wrong. Atmospheric pressure will only force air into a cylinder because of the pressure differential caused when the piston drops, ie. Suction, just like loading a syringe.

I agree with you on the intake stroke and also missed that question because I put suction.

I also don't know how you were supposed to figure out how big the gears were.

 

[DustDriver]

count the teeth(right word?) on it.

 

[Danoff]

count the teeth(right word?) on it.

OMG, forget it. The test took long enough as it was.

 

[Stevisiov]

74% I failed misserabley in some areas, elecricity mostly

 

[V1P3R]

66% Apparently I got a lot more right than I thought I would.

Same here... it was all the harder technical ones that got me.

 

[High-Test]

Maybe then I can has be genius in a few years too?

Just because you invented it doesn't mean you have to know it....

Your attempts to prove mortality are futile!!

Yes. You can has. If you go to grad school, you more can has.

I know I screwed up the one with the pipe.

 

[Keef]

I agree with you on the intake stroke and also missed that question because I put suction.

I also don't know how you were supposed to figure out how big the gears were.

I agree with you and BL. It was so suction. And yes, count the teeth you dummy.

 

[Danoff]

And yes, count the teeth you dummy.

**** that. When I saw there were 50 questions I nearly pushed eject as it was.

 

[Metar]

I didn't, either. When the distance between the teeth is the same on both wheels, and one is half the size of the other... It'd be difficult to have one with four times the number of teeth.

 

[icelt]

86% (43 out of 50) so not too hot.

But as you guys have noted, some of the language used can be misdirecting, hello editor 💡. Like in 41 where they state, "if a force of 50psi is applied..." so now I have to guess if "force" was selected specifically and they screwed up the units or if "psi" is intended and they used the incorrect noun. So naturally I guessed wrong, should have remembered to always trust the units right, grrrrr

And I'm taking issue with the balloon question as well, the atmospheric pressure is equivalent as each balloon is effectively at the exact same elevation. I can't believe they meant to measure the variable pressure at the very top of the balloons down to micro pascals. Assumptions, assumptions.

And the liquid cooling question could stand a little clarification about the heat conductive qualities about the surface the containers are resting on. Or are they hovering magically in mid air. I know, I know I'm really nitpicking now but that's what happens when I'm hung over.

 

[Philly]

86% (43 out of 50) so not too hot.

Not bad:tup:.

But as you guys have noted, some of the language used can be misdirecting, hello editor 💡. Like in 41 where they state, "if a force of 50psi is applied..." so now I have to guess if "force" was selected specifically and they screwed up the units or if "psi" is intended and they used the incorrect noun. So naturally I guessed wrong, should have remembered to always trust the units right, grrrrr

I'm not sure exactly what you were saying, but if a force is applid on a large surface at a certain psi, then the total force would be the psi multiplied by the area. The same force will come out on the other end, but a smaller area will have the same "p" in a smaller "si." Because there is an inverse relationship (pressure increases as area decreases), the psi ont he small end will be more than that on the big end.

And I'm taking issue with the balloon question as well, the atmospheric pressure is equivalent as each balloon is effectively at the exact same elevation. I can't believe they meant to measure the variable pressure at the very top of the balloons down to micro pascals. Assumptions, assumptions.

I think the assumption was that each balloon contains the same amount of air, but that each is in a different pressure environment.

And the liquid cooling question could stand a little clarification about the heat conductive qualities about the surface the containers are resting on. Or are they hovering magically in mid air. I know, I know I'm really nitpicking now but that's what happens when I'm hung over.

So the more surface that is in contact with the surroundings, the faster it cools. Therefore, the smaller surface area will take longer to cool.

 

[icelt]

Not bad. 👍

Thanks but as a degreed engineer I'm still giving myself a C.

I'm not sure exactly what you were saying, but if a force is applid on a large surface at a certain psi, then the total force would be the psi multiplied by the area. The same force will come out on the other end, but a smaller area will have the same "p" in a smaller "si." Because there is an inverse relationship (pressure increases as area decreases), the psi ont he small end will be more than that on the big end.

I completely agree with your description, but my point is simply that a force applied over an area is the definition of the term "pressure." So in the question the writer used the term force where the correct term is pressure, that's all I'm saying.

I think the assumption was that each balloon contains the same amount of air, but that each is in a different pressure environment.

Ok, ok now I see what they and you are saying. I thought all 3 were right next to one another, in the exact same environment and thus all sharing the same atmosphere. So in my mind the only reason for the volume differences was due to variable elasticity of the balloon material. I was reading it as a trick question obviously, thinking too deep into it.

So the more surface that is in contact with the surroundings, the faster it cools. Therefore, the smaller surface area will take longer to cool.

Agreed again. I was just over thinking it, again. The primary mode of heat loss is by convection to the air, which now looking back is pretty much what they were trying to get at. I was trying to make it way more complex then they intended.

 

[Philly]

Ok, ok now I see what they and you are saying. I thought all 3 were right next to one another, in the exact same environment and thus all sharing the same atmosphere. So in my mind the only reason for the volume differences was due to variable elasticity of the balloon material. I was reading it as a trick question obviously, thinking too deep into it.

You shouldn't really be too worried about that. This is a "scientific" test and those usually require that all of the variables have been stated. Apparently this test does not do a very good job of doing that.

And that makes me wonder if I would want to go look for a job over at Ford...

 

[Perfect Balance]

I just took it my first time and got a 86%.

I'm also chatting on msn.

EDIT: Keef, make a ranking list on the first post.

EDIT: Dammit, that last one was easy, I put driveshaft.

EDIT: I can has be genius. High School senior here.

 

[Kylehnat]

I got 84% in about 10 minutes, because speed is essential when taking tests which will determine your life path .

 

[Boundary Layer]

But as you guys have noted, some of the language used can be misdirecting, hello editor 💡. Like in 41 where they state, "if a force of 50psi is applied..." so now I have to guess if "force" was selected specifically and they screwed up the units or if "psi" is intended and they used the incorrect noun. So naturally I guessed wrong, should have remembered to always trust the units right, grrrrr

That drove me nuts... by the wording, the units should have been in lbf or N. If it were force the reaction would be equal and opposite, and as I recall, that wasn't even an option, so I made the assumption that the units were correct and that the creator of the test was too ignorant to distinguish force from pressure.

edit: that "which wrench is better" question is open to speculation as well... I mean, I know that I can't always fit the ideal wrench onto a nut/bolt due to space limitations. The long wrench might make the task significantly more difficult.

 

[Keef]

edit: that "which wrench is better" question is open to speculation as well... I mean, I know that I can't always fit the ideal wrench onto a nut/bolt due to space limitations. The long wrench might make the task significantly more difficult

Oh, now that's just nitpicking.

 

[Boundary Layer]

Oh, now that's just nitpicking.

Indeed it is.
It really should be worded differently though. Something like: "All other things being equal, which wrench allows the end user to apply more torque?"

 

[Keef]

Yeah, there was a lot of assumption to be done on almost every question. I guess that makes you analyze the whole thing and figure out which answer makes the most sense. Or something.

 

[icelt]

That drove me nuts... by the wording, the units should have been in lbf or N. If it were force the reaction would be equal and opposite, and as I recall, that wasn't even an option, so I made the assumption that the units were correct and that the creator of the test was too ignorant to distinguish force from pressure.

Right. Velocity, speed it's all the exact same thing to the layperson

edit: that "which wrench is better" question is open to speculation as well... I mean, I know that I can't always fit the ideal wrench onto a nut/bolt due to space limitations. The long wrench might make the task significantly more difficult

As any person who's ever changed the plugs on an Impreza knows

 

[Matt R]

56%.

I can drive a car. Just not work on one.