Was posted in alt.machines.cnc... But doesn't seem to have migrated over
here yet...
http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
I scored a 430...
I've got the unfair advantage over some of you of being trained here on the
job... But never had schooling in most of this so...
Share your score with us... No shame or bragging rights, just a fun test.
Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
V8013-R
In article <[email protected]>, "HDRDTD" <[email protected]> wrote:
>This one triped up every engineer here that has taken the test so far.
>
>I was thinking along the same lines at first, noting that if you measure
>from the center of each box to the fulcrum, the the distance ratio appears
>to be 5:1
Not "appears to be". Is.
> but that results in an answer of 60kg, and that ain't an option
>given.
That's because the testmaker screwed up, and forgot that the weights will
behave as point masses located at their respective centers of gravity. 60kg is
the correct answer.
>
>However....
>
>If you look at it as each box sites on two segments, and count that way, or
>in other words if each segment was shown as the width of a box, the the
>ratio appears as 3:1 which provides the correct solution.
No, not the correct solution -- the solution that matches their answer.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.
WoodWizzard wrote:
> Not bad for an "Old Mechanic" who learned from the school of hard
> knocks, and my Dad. I started pulling wrenchs at the age of 5 in my
> Dad's shop.
>
> Score of 460 %92
>
>
>
> Joe AutoDrill wrote:
>
>> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>> here yet...
>>
>> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>>
>> I scored a 430...
>>
>> I've got the unfair advantage over some of you of being trained here on the
>> job... But never had schooling in most of this so...
>>
>> Share your score with us... No shame or bragging rights, just a fun test.
>>
>> Regards,
>> Joe Agro, Jr.
>> (800) 871-5022
>> 01.908.542.0244
>> Automatic / Pneumatic Drills: http://www.AutoDrill.com
>> Multiple Spindle Drills: http://www.Multi-Drill.com
>>
>> V8013-R
>>
Wow! Sorry, but had to brag a bit here. No schooling in any of this,
except a bit in electricity. I got 440! WTF? Sure didn't expect that!
Harvey
On 23 Oct, 16:59, "Joe AutoDrill" <[email protected]> wrote:
> I scored a 430...
470, but I wasn't impressed by some of the questions. As an example,
the "two boxes on a seesaw" has a range of possible answers, depending
on whether they're a point mass or a distributed mass within the box.
To get their answer you have to assume a point mass, that's a pretty
tenuous stretch of the imagination. Redrawing the diagram a little
better would clarify things.
Anyone found the full set of correct answers yet? I'm too busy just at
the minute, but it would be interesting to see them.
On Oct 23, 1:26 pm, Chris Friesen <[email protected]> wrote:
> Joe AutoDrill wrote:
> >http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> > I scored a 430...
> > Share your score with us... No shame or bragging rights, just a fun test.
>
> Fun little test. I got 480.
>
> Their answer to #16 is wrong. Since the ropes are angled somewhat the
> actual force would be more than 50kg. (And besides, kg are a unit of
> mass, not force. The actual force would be a bit more than 9.8 * 50
> Newtons.)
>
> I too think their answer in #31 is wrong, and some of their electrical
> symbols are a bit funky.
>
> I got wrong the pipe one wrong. I expect that Bernoulli's principle
> means that the pressure is lower in the narrower section.
>
> I also got the "naturally aspirated engine" one wrong. I said it was
> suction from the piston, but really that wouldn't cause anything to
> happen without atmospheric pressure pushing it in, so I guess I can't
> complain.
>
> Chris
Ditto in score (480) and ditto in complaints.
Without the piston creating a (partial) vacuum, the atmosphere could
NOT push in the air....and the piston down.
Got the pipe one wrong too.
On 23 Oct, 18:14, Andy Dingley <[email protected]> wrote:
> Anyone found the full set of correct answers yet?
When you can see the results, it's easier...
Q7 (which geartrain is which) is just plain wrong. Even allowing for
crazy Yankee terminology, there's no way that the one train of three
pinions (the others are all 2) can be "reverse". That's not mechanical
aptitude, that's assuming that you're looking inside a RWD car gearbox
(where the extra idler gear is indeed used for reverse) -- but then
"direct drive" in that context wouldn't be using any of the gears.
Q45 The balloons are another bad question. Three balloons illustrated
as being next to each other? Of course the atmospheric pressure is
identical (Pascal's principle, if you care), it's far more likely that
they're made of thicker rubber than there's some sort of barometric
change across the page.
On Oct 23, 11:59 am, "Joe AutoDrill" <[email protected]> wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills:http://www.AutoDrill.com
> Multiple Spindle Drills:http://www.Multi-Drill.com
>
> V8013-R
420 , not bad for an offcie worker.
On 23 Oct, 16:59, "Joe AutoDrill" <[email protected]> wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills:http://www.AutoDrill.com
> Multiple Spindle Drills:http://www.Multi-Drill.com
>
> V8013-R
I scored 470
On Oct 23, 3:07 pm, "Joe AutoDrill" <[email protected]> wrote:
> > Ditto in score (480) and ditto in complaints.
> > Without the piston creating a (partial) vacuum, the atmosphere could
> > NOT push in the air....and the piston down.
>
> Without an atmosphere, there would be no vacuum. :)
> --
Vacuum is the default. The voids of space are a vacuum.
Atmosphere and its pressure are the aberration.
The piston is mechanically pulled down to create a condition akin to a
vacuum.
The mere presence of an atmosphere allows a flow to occur TO the
vacuum.
The atmospheric pressure does NOT create a vacuum. In the piston's
case, a mechanical event creates a vacuum. The void created by
removing atmospheric pressure creates the vacuum, therefore......
On Oct 23, 4:59 pm, "HDRDTD" <[email protected]> wrote:
> "Robatoy" <[email protected]> wrote in message
>
> news:[email protected]...
>
> > On Oct 23, 1:26 pm, Chris Friesen <[email protected]> wrote:
> >> Joe AutoDrill wrote:
> >> >http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> >> > I scored a 430...
> >> > Share your score with us... No shame or bragging rights, just a fun
> >> > test.
>
> >> Fun little test. I got 480.
>
> >> Their answer to #16 is wrong. Since the ropes are angled somewhat the
> >> actual force would be more than 50kg. (And besides, kg are a unit of
> >> mass, not force. The actual force would be a bit more than 9.8 * 50
> >> Newtons.)
>
> >> I too think their answer in #31 is wrong, and some of their electrical
> >> symbols are a bit funky.
>
> >> I got wrong the pipe one wrong. I expect that Bernoulli's principle
> >> means that the pressure is lower in the narrower section.
>
> >> I also got the "naturally aspirated engine" one wrong. I said it was
> >> suction from the piston, but really that wouldn't cause anything to
> >> happen without atmospheric pressure pushing it in, so I guess I can't
> >> complain.
>
> >> Chris
>
> > Ditto in score (480) and ditto in complaints.
> > Without the piston creating a (partial) vacuum, the atmosphere could
> > NOT push in the air....and the piston down.
> > Got the pipe one wrong too.
>
> Again, this one is debatable as both 'Suction' and 'Atmospheric Pressue' are
> valid answers.
>
> As the piston goes down, it results in lowering the air pressure inside the
> chamber. Thus there is now a difference in pressure between inside the
> chamber and outside. It's this difference in air pressure that results in
> air flowing into the chamber.
>
> Of course the piston going down creates a lower pressure in the chamber,
> which results in 'sucking' the air in.
>
> Both answers are correct.
No they are not.
Atmospheric pressure is 14.6 PSIA A little over 14 psi over nothing.
Nothing (vacuum) is the default.
The downward pull of the piston is created by a mechanical input.
(Flywheel, whatever)
The atmosphere simply fills that void...it surely does not CREATE the
vacuum.
On Oct 23, 6:33 pm, "Swingman" <[email protected]> wrote:
> "Robatoy" wrote
>
> > Ditto in score (480)
>
> Not being smart enough to make this old box do/allow php, I don't see
> anything but a banner ad for trucks and diesel parts ... so I guess I fail
> by default.
>
> Sounds interesting, though.
I will remain interesting as long as Miller doesn't find a semantic
error somewhere by somebody.
Nobody throws cold water on warm, fuzzy, cozy discussions like Miller.
On Oct 23, 8:04 pm, [email protected] (Doug Miller) wrote:
> In article <[email protected]>, Tom Veatch wrote:
>
> >missed the planetary gear direction, matching up the description
> >(reverse, reduction, etc.) with the gear pictures, and the fan blowing
> >on the fan.
>
> The fan blowing on the fan is an ambiguous question. They're facing each
> other, and spinning the "same" direction, in the sense that when viewed from
> the side, they're both spinning down on the edge facing you (or up, depending
> on which side you're on). But when each one is viewed from *its*own* front,
> one is spinning clockwise, and the other counterclockwise.
>
> So is that the same direction? Or the opposite direction?
>
> --
> Regards,
> Doug Miller (alphageek at milmac dot com)
>
> It's time to throw all their damned tea in the harbor again.
Both blades rotate in the same direction regardless of vantage point.
You stand behind one fan, and both blades turn clockwise. You stand
behind the other, both blades turn anti-clockwise. What on earth is so
hard about that, oh wise one?
Scored 480.
I missed the one regarding the normally aspirated engine. I thought
long and hard about it because I considered it ambiguous. I know this
has been discussed here but this is my take:
The airflow is not caused just by atmospheric pressure alone, nor by
the vacuum created within the cylinder alone. It's the differential
in pressure which causes the airflow. So, to me, although neither of
those two choices were precise, it had to be one or the other. I
guessed wrong :-)
For that matter, you could even say it's caused by gravity since
without gravity there would be no atmosphere nor atmospheric
pressure :-) So the answer should really be (a)(b) and (c)
The other one I missed was the one with the various drive train
components. I knew which way all the gears were spinning but had
trouble with the terminology of the labeling.
- MB
Scored 480, missed two questions.
(Sorry if this post gets duplicated but it didn't go through the first
time I submitted it)
The question about the normally aspirated engine I believe was
ambiguous. I wasn't sure whether to pick atmospheric pressure, or
vacuum created by the piston as the reason for their being airflow.
The reason being that the airflow is a result of the pressure
differential between the atmosphere and that inside the cylinder, so
either of those two choices by themselves is really only half the
answer. I more or less randomly picked the vacuum answer since it
seemed more a specific aspect of an engine - but that was the wrong
one :-)
In fact, the other multiple choice answer "gravity" plays a factor in
the whole thing too since there would be no atmosphere if there were
no gravity :-) Gravity also produces the atmospheric pressure as
well.
The other one I missed was the one with the gear drive train. I knew
which direction and what (relative) speeds the gears were spinning but
was not familiar with the terminology of the labels.
On 24 Oct, 13:56, [email protected] (Doug Miller) wrote:
> Without knowing what frame of reference is intended by the testmaker, it's not
> possible to determine which answer is "correct".
The obvious frame of reference for a question would be that of the
overall question, i.e. "same" means that the fans rotate such that
they don't have a blade speed relative to each other. If we were a fan
shop, then we might well regard "same" differently, as meaning that
they're both clockwise when reading the maker's plate.
Unfortunately thhis common and sensible convention is then defeated by
the balloons question. That only makes sense if we regard each balloon
as being in a separate system.
On Oct 23, 11:59 am, "Joe AutoDrill" <[email protected]> wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
Please, if we can't see the answer sheet, don't recommend the test.
I went and took it, got 400, but was disappointed in not having an
opportunity to know which questions i got "right" according to thier
proctor.
Reading the responses here, it would appear that I share some of
"folk's" concerns relative to the design of the test.
I hate to count gear teeth (they could have done that for us with
labels.
I should have eaten breakfast instead
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills:http://www.AutoDrill.com
> Multiple Spindle Drills:http://www.Multi-Drill.com
>
> V8013-R
On Oct 23, 11:59 am, "Joe AutoDrill" <[email protected]> wrote:
Just love those kind of tests. They illustrate, to me, that people
like me, who do well, are people who are cynical enought to anticipate
semantics. The answers fall into two categories:
What do they want?
and
What is right?
Some of these questions fall into the category of:
Have you stopped beating your wife?
Sometimes there is no right answer and the questioner has to be taken
to task.
In any classroom I have ever taught, I would have been murdered by my
students simply becaue the ambiguity of half of those questions.
So:
Has you mother ever caught you masturbating?
On 23 Oct, 18:14, Andy Dingley <[email protected]> wrote:
> I wasn't impressed by some of the questions. As an example,
> the "two boxes on a seesaw" has a range of possible answers, depending
> on whether they're a point mass or a distributed mass within the box.
If you look back now, you'll see that they've changed the seesaw
question in the test! Maybe the authors are reading this newsgroup?
OTOH, the change they've made (triangular boxes) is farcical and shows
that they really don't understand the issue that was raised 8-(
Joe AutoDrill wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
470.
I agree with Chip on Q31. But by his (and my) analysis, none of the
answers given were correct.
--Steve
Joe AutoDrill wrote:
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
> Share your score with us... No shame or bragging rights, just a fun test.
Fun little test. I got 480.
Their answer to #16 is wrong. Since the ropes are angled somewhat the
actual force would be more than 50kg. (And besides, kg are a unit of
mass, not force. The actual force would be a bit more than 9.8 * 50
Newtons.)
I too think their answer in #31 is wrong, and some of their electrical
symbols are a bit funky.
I got wrong the pipe one wrong. I expect that Bernoulli's principle
means that the pressure is lower in the narrower section.
I also got the "naturally aspirated engine" one wrong. I said it was
suction from the piston, but really that wouldn't cause anything to
happen without atmospheric pressure pushing it in, so I guess I can't
complain.
Chris
"Steve" <[email protected]> wrote in message
news:[email protected]...
> Joe AutoDrill wrote:
>> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>> here yet...
>>
>> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>>
>> I scored a 430...
>>
>> I've got the unfair advantage over some of you of being trained here on
>> the
>> job... But never had schooling in most of this so...
>>
>> Share your score with us... No shame or bragging rights, just a fun
>> test.
>>
>
> 470.
>
> I agree with Chip on Q31. But by his (and my) analysis, none of the
> answers given were correct.
>
Same score and comment on Q31 as Steve.
Kerry
"Joe AutoDrill" <[email protected]> wrote in message news:9ToTi.1289$Gq2.470@trnddc01...
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
450
Missed:
#7. I reversed their opinion of the direct vs reversing drive. I picked C as
the reversing drive since the two gears go in the opposite direction. I am
a EE so I admit ignorance about the choice of terminology. I still like my
choices better.
#11. The screw drive I am probably wrong (see previous comment about
being an EE).
#31. I also agree that the correct answer should be 60. I picked 50 as being
the closest. The only way that 100 would be correct if the weights are a
point mass and the mass is at the outside edge of each box.
#38. This one is ambiguous. Since the two fans are facing in opposite
directions, what frame of reference should be used? I chose that the
unpowered fan will be going in reverse (compared to what it would be going
if it had power applied).
#44. Another ambiguous question. I finally chose C (in tube A only). I had initially
selected A (higher in tube A then tube B) but changed to C. As mentioned by
another poster. This is a venturi tube. The height in tube B will definitely be
lower than tube A. Whether there is any water in tube B depends upon the outlet
pressure at the right. I guessed that they wanted C. After I went to the next
question. I reconsidered since A would be technically more correct. However
getting the answer correctly on a test involves guessing what is expected
by the people creating the test. I guessed wrong.
"HDRDTD" <[email protected]> wrote in message news:[email protected]...
> If you look at it from a simplistic point of view and you assume the box occupies 2 segments, then
> the right box is 3 times as far away (the correct answer) but if you compare from the middle of
> the left box to the middle of the right box, then the ratios appears to be 5:1 not 3:1.
>
> you need to look at the test as an ENTRANCE exam, rather tha as a final examine. Don't make things
> more complicated than they need to be.
I dare you to take a real set of boxes and a real lever and fulcrum and
try it. You will not get 100. As illustrated (and assuming that the boxes are
homogeneous) the correct answer is 60.
"Andy Dingley" <[email protected]> wrote in message
news:[email protected]...
> On Tue, 23 Oct 2007 13:38:20 -0700, "Dan Coby" <[email protected]>
> wrote:
>
>>#44. Another ambiguous question. I finally chose C (in tube A only). I had initially
>>selected A (higher in tube A then tube B) but changed to C.
>
> This is a very obvious one -- _if_ you remember that it's for a vehicle
> company. Bernoulli's principle (the pressure drops if the flow velocity
> speeds up) is a key part of how petrol carburettors work.
You clipped my original posting. Your clipping totally mangles my statements
about why I think that this question is ambiguous and my reasons for making
the choice that I did.
Yes, I know about Bernoulli's principle and about venturi tubes, carburetors, etc.
I took physics long ago (about 37 years) and I do remember Bernoulli's principle.
I said: "This is a venturi tube. The height in tube B will definitely be lower than tube A."
If the pressure in the venturi (i.e at the point that tube B is connected) is low enough
then there may not be no water at all in tube B. (In this case 'low enough' means
less than the ambient air pressure or whatever is the pressure at the top of tube
B.)
For example, I have a little device that is used to drain the water from a waterbed.
The device is screwed to a faucet and it has a venturi. A hose connects from the
middle of the constriction to a waterbed. To use the device, you turn on the faucet
and water flows through the venturi and then out of the device. The device makes
use of the reduced pressure in the venturi to draw water from the waterbed. (Of
course it is high atmospheric pressure which is forcing the water from the water
bed. The venturi does not actually 'suck' the water.)
My original post on this issue:
#44. Another ambiguous question. I finally chose C (in tube A only). I had initially
selected A (higher in tube A then tube B) but changed to C. As mentioned by
another poster. This is a venturi tube. The height in tube B will definitely be
lower than tube A. Whether there is any water in tube B depends upon the outlet
pressure at the right. I guessed that they wanted C. After I went to the next
question. I reconsidered since A would be technically more correct. However
getting the answer correctly on a test involves guessing what is expected
by the people creating the test. I guessed wrong.
"Joe AutoDrill" <[email protected]> wrote in message
news:9ToTi.1289$Gq2.470@trnddc01...
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on
> the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills: http://www.AutoDrill.com
> Multiple Spindle Drills: http://www.Multi-Drill.com
>
> V8013-R
======> Got a 470. Good test!
Leif
Phisherman wrote:
> On Wed, 24 Oct 2007 00:12:15 -0000, Robatoy <[email protected]>
> wrote:
>
>> On Oct 23, 8:04 pm, [email protected] (Doug Miller) wrote:
>>> In article <[email protected]>, Tom Veatch wrote:
>>>
>>>> missed the planetary gear direction, matching up the description
>>>> (reverse, reduction, etc.) with the gear pictures, and the fan blowing
>>>> on the fan.
>>> The fan blowing on the fan is an ambiguous question. They're facing each
>>> other, and spinning the "same" direction, in the sense that when viewed from
>>> the side, they're both spinning down on the edge facing you (or up, depending
>>> on which side you're on). But when each one is viewed from *its*own* front,
>>> one is spinning clockwise, and the other counterclockwise.
>>>
>>> So is that the same direction? Or the opposite direction?
>>>
>>> --
>>> Regards,
>>> Doug Miller (alphageek at milmac dot com)
>>>
>>> It's time to throw all their damned tea in the harbor again.
>> Both blades rotate in the same direction regardless of vantage point.
>> You stand behind one fan, and both blades turn clockwise. You stand
>> behind the other, both blades turn anti-clockwise. What on earth is so
>> hard about that, oh wise one?
>
>
> The confusion is "same direction" and where the observer stands when
> evaluating the direction of each fan. Part of this test is
> understanding the question. I should have got a perfect score with my
> background and education, but did not. I excel at engineering and
> math, but English comprehension is another story.
You could look at it this way: The fan that is running is turning in its
normal direction, and the fan that is not running is turning opposite of
its normal direction. Therefore, they are turning in opposite
directions. This reasoning makes the most sense to me, because it takes
point of view totally out of the equation.
In article <9ToTi.1289$Gq2.470@trnddc01>,
Joe AutoDrill <[email protected]> wrote:
>Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>here yet...
>
>http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
>I scored a 430...
>
>I've got the unfair advantage over some of you of being trained here on the
>job... But never had schooling in most of this so...
Yawn. 480
Both the ones I missed are written so badly that it is very arguable as to
what the right answer is..
In article <[email protected]>,
Doug Miller <[email protected]> wrote:
>In article <[email protected]>, "HDRDTD"
><[email protected]> wrote:
>>This one triped up every engineer here that has taken the test so far.
>>
>>I was thinking along the same lines at first, noting that if you measure
>>from the center of each box to the fulcrum, the the distance ratio appears
>>to be 5:1
>
>Not "appears to be". Is.
HUH???
I see two triangles point down.
center of mass _is_ the same as the point of contact with the lever.
The lever is already marked in uniform segments.
The one on the left is _two_ segments out from the fulcrum
The one on the right is _six_ segments out from the fulcrum.
How in name of {something} do you come up with anything other than 3:1??
In article <[email protected]>,
Robatoy <[email protected]> wrote:
>On Oct 23, 8:04 pm, [email protected] (Doug Miller) wrote:
>> In article <[email protected]>, Tom Veatch wrote:
>>
>> >missed the planetary gear direction, matching up the description
>> >(reverse, reduction, etc.) with the gear pictures, and the fan blowing
>> >on the fan.
>>
>> The fan blowing on the fan is an ambiguous question. They're facing each
>> other, and spinning the "same" direction, in the sense that when viewed from
>> the side, they're both spinning down on the edge facing you (or up, depending
>> on which side you're on). But when each one is viewed from *its*own* front,
>> one is spinning clockwise, and the other counterclockwise.
>>
>> So is that the same direction? Or the opposite direction?
>>
>> --
>> Regards,
>> Doug Miller (alphageek at milmac dot com)
>>
>> It's time to throw all their damned tea in the harbor again.
>
>Both blades rotate in the same direction regardless of vantage point.
>You stand behind one fan, and both blades turn clockwise. You stand
>behind the other, both blades turn anti-clockwise. What on earth is so
>hard about that, oh wise one?
>
It's a matter of viewpoint. the question is BADLY worded.
If both fans were turning in the 'same' direction,, both would be pushing
air from back-to-front of the fan.
one fan is turning 'forwards' the air is travelling from back to front
of that fan.
The other fan is turning 'backwards' the air is traelling from front to
back of thhat fan.
Considered from a single external viewpoint, both are rotati in the same
diretion.
Considered from the view point of the motor on each fan, for _that_
fan, they are rotatig in different diretion.
The issue is whether the fan 'reverses diretion of rotation' just beause
you point it in a different diretion.
*GENERALLY* shaft rotation is measured relative to the motor, indepedant
of absolut orientation in space.
I scored a 430 too. (It has been 25 years since my mechanical
engineering degree.)
On Tue, 23 Oct 2007 15:59:01 GMT, "Joe AutoDrill" <[email protected]>
wrote:
>Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>here yet...
>
>http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
>I scored a 430...
>
>I've got the unfair advantage over some of you of being trained here on the
>job... But never had schooling in most of this so...
>
>Share your score with us... No shame or bragging rights, just a fun test.
>
>Regards,
>Joe Agro, Jr.
>(800) 871-5022
>01.908.542.0244
>Automatic / Pneumatic Drills: http://www.AutoDrill.com
>Multiple Spindle Drills: http://www.Multi-Drill.com
>
>V8013-R
>
>
On Tue, 23 Oct 2007 15:59:01 GMT, "Joe AutoDrill" <[email protected]>
wrote:
>Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>here yet...
>
>http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
>I scored a 430...
>
470
missed the planetary gear direction, matching up the description
(reverse, reduction, etc.) with the gear pictures, and the fan blowing
on the fan.
Tom Veatch
Wichita, KS
USA
"Joe AutoDrill" <[email protected]> wrote in
news:9ToTi.1289$Gq2.470@trnddc01:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated
> over here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here
> on the job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun
> test.
>
> Regards,
> Joe Agro, Jr.
Well, I didn't do that great. 370.
I missed many of the same questions others did, and messed up a few on my
own. The ones I did mess up where the ones involving some math (and
physics) mainly because I just half guessed.
I'm not sure about the question with the three lights and switch
bypassing one. They're going off a common misconception that electricity
follows the path of least resistance, but that cannot be true. Parallel
circuits would NOT work if it was. If I remember, I'll test it on a
breadboard later.
Puckdropper
--
Wise is the man who attempts to answer his question before asking it.
To email me directly, send a message to puckdropper (at) fastmail.fm
"Joe AutoDrill" <[email protected]> wrote in
news:k5tTi.1314$Gq2.864@trnddc01:
>> Such as the intake stroke bringing air in. Air pressure is the
>> correct answer but 'suction' should also be correct, by definition.
>
> Someone said that suction can't exist without air in the first place.
> :)
>
> Fun little time waster though, eh?
>
> Regards,
> Joe Agro, Jr.
They are mutually dependant, or IOW, one cannot exist without the other.
Thus, both answers are right.
Puckdropper
--
Wise is the man who attempts to answer his question before asking it.
To email me directly, send a message to puckdropper (at) fastmail.fm
Tom Veatch wrote in news:[email protected]:
> On 23 Oct 2007 20:19:34 GMT, Puckdropper <[email protected]>
> wrote:
>
>>I'm not sure about the question with the three lights and switch
>>bypassing one. They're going off a common misconception that
>>electricity follows the path of least resistance, but that cannot be
>>true. Parallel circuits would NOT work if it was. If I remember,
>>I'll test it on a breadboard later.
>>
>>Puckdropper
>
>
> The current in each branch of the parallel paths will be inversely
> related to the resistance of the branch and directly related to the
> resistance of the parallel branch. You can use Ohm's law (E=IR) to
> derive the mathematical relationship.
>
> If you assume the path through the switch has zero resistance (an OK
> first approximation) then the current through the lamp would be zero.
> As the resistance of the path through the switch increases, the amount
> of current through the lamp would increase.
>
> If you breadboard it, insert a variable resistor in series with the
> switch. I predict that as you increase the resistance of the path
> through the switch, the brightness of the lamp will also increase.
>
> Tom Veatch
> Wichita, KS
> USA
That makes a LOT more sense. I'll have to breadboard it to see what
actually happens...
Puckdropper
--
Wise is the man who attempts to answer his question before asking it.
To email me directly, send a message to puckdropper (at) fastmail.fm
[email protected] (Doug Miller) wrote in
news:[email protected]:
> There's a "review" button at the end. Not especially obvious, but it's
> there.
>
If you found the review button, add 10 points to your score. :-)
Puckdropper
--
Wise is the man who attempts to answer his question before asking it.
To email me directly, send a message to puckdropper (at) fastmail.fm
On Tue, 23 Oct 2007 10:14:13 -0700, Andy Dingley
<[email protected]> wrote:
>On 23 Oct, 16:59, "Joe AutoDrill" <[email protected]> wrote:
>
>> I scored a 430...
>
>470, but I wasn't impressed by some of the questions. As an example,
>the "two boxes on a seesaw" has a range of possible answers, depending
>on whether they're a point mass or a distributed mass within the box.
>To get their answer you have to assume a point mass, that's a pretty
>tenuous stretch of the imagination. Redrawing the diagram a little
>better would clarify things.
>
>Anyone found the full set of correct answers yet? I'm too busy just at
>the minute, but it would be interesting to see them.
Agree! To get an answer that is listed, you have to assume the CG of
each box is at the outer edge of the box..
Tom Veatch
Wichita, KS
USA
"Robatoy" <[email protected]> wrote in message
news:[email protected]...
> On Oct 23, 11:59 am, "Joe AutoDrill" <[email protected]> wrote:
>
> Just love those kind of tests. They illustrate, to me, that people
> like me, who do well, are people who are cynical enought to anticipate
> semantics. The answers fall into two categories:
> What do they want?
> and
> What is right?
>
> Some of these questions fall into the category of:
> Have you stopped beating your wife?
>
> Sometimes there is no right answer and the questioner has to be taken
> to task.
>
> In any classroom I have ever taught, I would have been murdered by my
> students simply becaue the ambiguity of half of those questions.
>
> So:
> Has you mother ever caught you masturbating?
>
See all those hairy palms waving?
The best way I've found to deal with ambiguity is to ask myself "how would I
answer this if I were an idiot?" Works most every time, though sometimes
all are so ridiculous that I have to fall back to option B and go with the
longest answer.
Even works on non-government tests, as my molecular Biology prof learned
when I showed him the longest answer rule on his tests. I let him off with
a six-pack of domestic.
On Tue, 23 Oct 2007 16:54:03 -0400, "HDRDTD" <[email protected]>
wrote:
>This one triped up every engineer here that has taken the test so far.
>
>I was thinking along the same lines at first, noting that if you measure
>from the center of each box to the fulcrum, the the distance ratio appears
>to be 5:1 but that results in an answer of 60kg, and that ain't an option
>given.
>
>However....
>
>If you look at it as each box sites on two segments, and count that way, or
>in other words if each segment was shown as the width of a box, the the
>ratio appears as 3:1 which provides the correct solution.
>
>
I found this question doesn't have a correct answer. This is a simple
"moment arm" calculation. The center of gravity of the weight to the
fulcrum. In real life, the board itself must be considered, and it,
too, has a moment arm. "60kg" is correct but not a choice.
"Robatoy" <[email protected]> wrote in message
news:[email protected]...
> On Oct 23, 1:26 pm, Chris Friesen <[email protected]> wrote:
>> Joe AutoDrill wrote:
>> >http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>>
>> > I scored a 430...
>> > Share your score with us... No shame or bragging rights, just a fun
>> > test.
>>
>> Fun little test. I got 480.
>>
>> Their answer to #16 is wrong. Since the ropes are angled somewhat the
>> actual force would be more than 50kg. (And besides, kg are a unit of
>> mass, not force. The actual force would be a bit more than 9.8 * 50
>> Newtons.)
>>
>> I too think their answer in #31 is wrong, and some of their electrical
>> symbols are a bit funky.
>>
>> I got wrong the pipe one wrong. I expect that Bernoulli's principle
>> means that the pressure is lower in the narrower section.
>>
>> I also got the "naturally aspirated engine" one wrong. I said it was
>> suction from the piston, but really that wouldn't cause anything to
>> happen without atmospheric pressure pushing it in, so I guess I can't
>> complain.
>>
>> Chris
>
> Ditto in score (480) and ditto in complaints.
> Without the piston creating a (partial) vacuum, the atmosphere could
> NOT push in the air....and the piston down.
> Got the pipe one wrong too.
>
Again, this one is debatable as both 'Suction' and 'Atmospheric Pressue' are
valid answers.
As the piston goes down, it results in lowering the air pressure inside the
chamber. Thus there is now a difference in pressure between inside the
chamber and outside. It's this difference in air pressure that results in
air flowing into the chamber.
Of course the piston going down creates a lower pressure in the chamber,
which results in 'sucking' the air in.
Both answers are correct.
In article <[email protected]>, Hoosierpopi <[email protected]> wrote:
>On Oct 23, 11:59 am, "Joe AutoDrill" <[email protected]> wrote:
>> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>> here yet...
>>
>> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>>
>> I scored a 430...
>>
>
>
>Please, if we can't see the answer sheet, don't recommend the test.
There's a "review" button at the end. Not especially obvious, but it's there.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.
I've challenged the Mech engineers where I work to take the test to see just
how they scored.
So far only a few have bothered taking it and they came in at 460, 470,480,
and me a non-engineer at 410.
There are a couple of questions that have debatable answers, depending on
your point of view.
Such as the intake stroke bringing air in. Air pressure is the correct
answer but 'suction' should also be correct, by definition.
The fulcrum with the two boxes on it, the left one near, the right one a
distance away is another.
If you look at it from a simplistic point of view and you assume the box
occupies 2 segments, then the right box is 3 times as far away (the correct
answer) but if you compare from the middle of the left box to the middle of
the right box, then the ratios appears to be 5:1 not 3:1.
you need to look at the test as an ENTRANCE exam, rather tha as a final
examine. Don't make things more complicated than they need to be.
"Nova" <[email protected]> wrote in message
news:SysTi.1351$f63.787@trndny03...
> Joe AutoDrill wrote:
>> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>> here yet...
>>
>> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>>
>> I scored a 430...
>>
>> I've got the unfair advantage over some of you of being trained here on
>> the
>> job... But never had schooling in most of this so...
>>
>> Share your score with us... No shame or bragging rights, just a fun
>> test.
>>
>> Regards,
>> Joe Agro, Jr.
>> (800) 871-5022
>> 01.908.542.0244
>> Automatic / Pneumatic Drills: http://www.AutoDrill.com
>> Multiple Spindle Drills: http://www.Multi-Drill.com
>>
>> V8013-R
>>
>>
>>
>
> 480
>
> --
> Jack Novak
> Buffalo, NY - USA
> [email protected]
Joe AutoDrill wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills: http://www.AutoDrill.com
> Multiple Spindle Drills: http://www.Multi-Drill.com
>
> V8013-R
>
>
>
480
--
Jack Novak
Buffalo, NY - USA
[email protected]
> Please, if we can't see the answer sheet, don't recommend the test.
Look harder next time. Sounds like your frustration caused you to miss the
small clickable link that brought up the answer sheet.
> I went and took it, got 400, but was disappointed in not having an
> opportunity to know which questions i got "right" according to thier
> proctor.
ibid.
> Reading the responses here, it would appear that I share some of
> "folk's" concerns relative to the design of the test.
Yep. Same with me... But it wasn't a "real" test so I'm not going to gripe
about it too much.
> I hate to count gear teeth (they could have done that for us with
> labels.
And they could have put the ratio below the gears too... I think being able
to properly count is part of the test IMHO.
> I should have eaten breakfast instead
I guess that all depends on what you would have eaten...
--
Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
V8013-R
> Ditto in score (480) and ditto in complaints.
> Without the piston creating a (partial) vacuum, the atmosphere could
> NOT push in the air....and the piston down.
Without an atmosphere, there would be no vacuum. :)
--
Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
V8013-R
410 -- not bad for a ex-computer weenie
The one useful thing I got from an education degree was an understanding
of testing theory. These guys made the same mistake you see on every
standardized test: only ONE selection can be true. Corollary: "All of the
above" should never be used. If "All of the above is correct", then all of
the other answers are also correct. The test designers try to get out of
this by saying, "Choose the most correct answer". But this is equivalent
to saying, "Choose the most pregnant woman". An answer is either correct
or not.
OK, I feel better now. Thanks for listening.
--
Steve B.
New Life Home Improvement
Joe AutoDrill wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills: http://www.AutoDrill.com
> Multiple Spindle Drills: http://www.Multi-Drill.com
>
> V8013-R
>
>
>
420. Thought I did better.
--
Gerald Ross
Cochran, GA
There's no substitute for good manners
except fast reflexes.
"Chip Buchholtz" <[email protected]> wrote in message
news:[email protected]...
> Joe AutoDrill <[email protected]> wrote:
> : Was posted in alt.machines.cnc... But doesn't seem to have migrated
> over
> : here yet...
>
> : http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> : I scored a 430...
>
> I scored a 420, and I think their answer for question 31 is wrong. I
> measured from the center of gravity of the load to the fulcrum, and
> they measured from the outer edge of the load to the fulcrum.
>
> I emailed them about it, so I'll probably find out that I screwed up.
>
> It's a fun quiz, thanks!
>
> --- Chip
It is a fun quiz, I scored a 460 - 92%.
Andy Dingley wrote:
> On 23 Oct, 18:14, Andy Dingley <[email protected]> wrote:
>
>
>>Anyone found the full set of correct answers yet?
>
>
> When you can see the results, it's easier...
>
> Q7 (which geartrain is which) is just plain wrong. Even allowing for
> crazy Yankee terminology, there's no way that the one train of three
> pinions (the others are all 2) can be "reverse". That's not mechanical
> aptitude, that's assuming that you're looking inside a RWD car gearbox
> (where the extra idler gear is indeed used for reverse) -- but then
> "direct drive" in that context wouldn't be using any of the gears.
>
> Q45 The balloons are another bad question. Three balloons illustrated
> as being next to each other? Of course the atmospheric pressure is
> identical (Pascal's principle, if you care), it's far more likely that
> they're made of thicker rubber than there's some sort of barometric
> change across the page.
>
I agree. They are the two I got wrong.
--
Jack Novak
Buffalo, NY - USA
[email protected]
On 24 Oct 2007 17:56:40 -0700, [email protected] wrote:
...
>The other one I missed was the one with the various drive train
>components. I knew which way all the gears were spinning but had
>trouble with the terminology of the labeling
Agree! And, that makes the test (or at least that question) invalid
for measuring aptitude. Perhaps it would be valid as an exit exam
after a course of instruction in which terminology/jargon was defined,
but not as an entrance exam prior to exposure to the jargon.
(I missed that one, too. So maybe the above is just a little sourness
in the grapes.)
Tom Veatch
Wichita, KS
USA
On Tue, 23 Oct 2007 13:38:20 -0700, "Dan Coby" <[email protected]>
wrote:
>#44. Another ambiguous question. I finally chose C (in tube A only). I had initially
>selected A (higher in tube A then tube B) but changed to C.
This is a very obvious one -- _if_ you remember that it's for a vehicle
company. Bernoulli's principle (the pressure drops if the flow velocity
speeds up) is a key part of how petrol carburettors work.
On Tue, 23 Oct 2007 15:59:01 GMT, "Joe AutoDrill" <[email protected]>
wrote:
>Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>here yet...
>
>http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
>I scored a 430...
>
>I've got the unfair advantage over some of you of being trained here on the
>job... But never had schooling in most of this so...
>
>Share your score with us... No shame or bragging rights, just a fun test.
>
>Regards,
>Joe Agro, Jr.
>(800) 871-5022
>01.908.542.0244
>Automatic / Pneumatic Drills: http://www.AutoDrill.com
>Multiple Spindle Drills: http://www.Multi-Drill.com
>
>V8013-R
>
>
One of the more interesting challenges that's been posted!
I scored 460.
John
Joe AutoDrill <[email protected]> wrote:
: Was posted in alt.machines.cnc... But doesn't seem to have migrated over
: here yet...
: http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
: I scored a 430...
I scored a 420, and I think their answer for question 31 is wrong. I
measured from the center of gravity of the load to the fulcrum, and
they measured from the outer edge of the load to the fulcrum.
I emailed them about it, so I'll probably find out that I screwed up.
It's a fun quiz, thanks!
--- Chip
In article <9ToTi.1289$Gq2.470@trnddc01>,
Joe AutoDrill <[email protected]> wrote:
>Was posted in alt.machines.cnc... But doesn't seem to have migrated over
>here yet...
>
>http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
>I scored a 430...
>
>I've got the unfair advantage over some of you of being trained here on the
>job... But never had schooling in most of this so...
>
>Share your score with us... No shame or bragging rights, just a fun test.
490. I'd like to know which question I missed....
HDRDTD <[email protected]> wrote:
: If you look at it as each box sites on two segments, and count that way, or
: in other words if each segment was shown as the width of a box, the the
: ratio appears as 3:1 which provides the correct solution.
No, then the ratio is 2.5 : 0.5, or 5:1, because the center of one
weight is halfway through the 3rd double segment, and the center of
the other weight is halfway through the first double segment.
I think it's clearer if you use circles or triangles to represent the
weights, so it's more obvious where the weight "is".
Or, think of each side as having two weights, each one segment wide
and half the total weight. You can treat the total weight as being at
the midpoint between the two weights, but you clearly can't ignore the
position of one weight and treat the total as being at the end of the
other weight.
--- Chip
Robert Bonomi wrote:
> In article <[email protected]>,
> Doug Miller <[email protected]> wrote:
>> In article <[email protected]>, "HDRDTD"
>> <[email protected]> wrote:
>>> This one triped up every engineer here that has taken the test so far.
>>>
>>> I was thinking along the same lines at first, noting that if you measure
>> >from the center of each box to the fulcrum, the the distance ratio appears
>>> to be 5:1
>> Not "appears to be". Is.
>
> HUH???
>
> I see two triangles point down.
...
They changed the pictures from boxes from the time the initial takers in
the thread visited the quiz so you're looking at a different problem
than the one under discussion...
--
Robert Bonomi <[email protected]> wrote:
: In article <[email protected]>,
: Doug Miller <[email protected]> wrote:
: I see two triangles point down.
: center of mass _is_ the same as the point of contact with the lever.
: The lever is already marked in uniform segments.
: The one on the left is _two_ segments out from the fulcrum
: The one on the right is _six_ segments out from the fulcrum.
: How in name of {something} do you come up with anything other than 3:1??
Aha! They got my message and fixed the question!
It used to be two squares, and the answer they wanted was based on the
*outer* edge of each square, not the center. I suggested that using
triangles or circles would make it easier to see where the center of
mass was; you wouldn't have to decide between the inner edge, the
center, or the outer edge.
--- Chip
Robert Bonomi wrote:
> In article <[email protected]>,
> Robatoy <[email protected]> wrote:
>> On Oct 23, 8:04 pm, [email protected] (Doug Miller) wrote:
>>> In article <[email protected]>, Tom
>>> Veatch
>>> wrote:
>>>
>>>> missed the planetary gear direction, matching up the description
>>>> (reverse, reduction, etc.) with the gear pictures, and the fan
>>>> blowing on the fan.
>>>
>>> The fan blowing on the fan is an ambiguous question. They're
>>> facing
>>> each other, and spinning the "same" direction, in the sense that
>>> when viewed from the side, they're both spinning down on the edge
>>> facing you (or up, depending on which side you're on). But when
>>> each one is viewed from *its*own* front, one is spinning
>>> clockwise,
>>> and the other counterclockwise.
>>>
>>> So is that the same direction? Or the opposite direction?
>>>
>>> --
>>> Regards,
>>> Doug Miller (alphageek at milmac dot com)
>>>
>>> It's time to throw all their damned tea in the harbor again.
>>
>> Both blades rotate in the same direction regardless of vantage
>> point.
>> You stand behind one fan, and both blades turn clockwise. You stand
>> behind the other, both blades turn anti-clockwise. What on earth is
>> so hard about that, oh wise one?
>>
>
> It's a matter of viewpoint. the question is BADLY worded.
>
> If both fans were turning in the 'same' direction,, both would be
> pushing air from back-to-front of the fan.
>
> one fan is turning 'forwards' the air is travelling from back to
> front of that fan.
>
> The other fan is turning 'backwards' the air is traelling from
> front
> to back of thhat fan.
>
> Considered from a single external viewpoint, both are rotati in the
> same diretion.
>
> Considered from the view point of the motor on each fan, for
> _that_
> fan, they are rotatig in different diretion.
>
> The issue is whether the fan 'reverses diretion of rotation' just
> beause you point it in a different diretion.
>
> *GENERALLY* shaft rotation is measured relative to the motor,
> indepedant of absolut orientation in space.
They really should have just done the same thing they did with their
first rotation question--have two arrows and you pick which one points
the direction of rotation.
--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
On Wed, 24 Oct 2007 07:40:54 -0500, "Charlie M. 1958"
<[email protected]> wrote:
>You could look at it this way: The fan that is running is turning in its
>normal direction, and the fan that is not running is turning opposite of
>its normal direction. Therefore, they are turning in opposite
>directions. This reasoning makes the most sense to me, because it takes
>point of view totally out of the equation.
That's exactly the way I looked at it - in terms of each fan - which
is why I "missed" the question. Too ambiguous and ill-defined. I think
I'll award myself another 10 points because I had the
physics/aerodynamics right, but flunked the "mind-reading" part of the
question.
OK, now I'm up to 480.
Tom Veatch
Wichita, KS
USA
> Without knowing what frame of reference is intended by the testmaker, it's
> not
> possible to determine which answer is "correct".
The test is probably written buy guys who can score a 100% on tests like
that... Which means they are engineers who didn't think through the process
as beta testers. :)
--
Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
V8013-R
> Such as the intake stroke bringing air in. Air pressure is the correct
> answer but 'suction' should also be correct, by definition.
Someone said that suction can't exist without air in the first place. :)
Fun little time waster though, eh?
Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
V8013-R
On 23 Oct 2007 20:19:34 GMT, Puckdropper <[email protected]>
wrote:
>I'm not sure about the question with the three lights and switch
>bypassing one. They're going off a common misconception that electricity
>follows the path of least resistance, but that cannot be true. Parallel
>circuits would NOT work if it was. If I remember, I'll test it on a
>breadboard later.
>
>Puckdropper
The current in each branch of the parallel paths will be inversely
related to the resistance of the branch and directly related to the
resistance of the parallel branch. You can use Ohm's law (E=IR) to
derive the mathematical relationship.
If you assume the path through the switch has zero resistance (an OK
first approximation) then the current through the lamp would be zero.
As the resistance of the path through the switch increases, the amount
of current through the lamp would increase.
If you breadboard it, insert a variable resistor in series with the
switch. I predict that as you increase the resistance of the path
through the switch, the brightness of the lamp will also increase.
Tom Veatch
Wichita, KS
USA
In article <[email protected]>, [email protected] (Robert Bonomi) wrote:
>In article <[email protected]>,
>Doug Miller <[email protected]> wrote:
>>In article <[email protected]>, "HDRDTD"
>><[email protected]> wrote:
>>>This one triped up every engineer here that has taken the test so far.
>>>
>>>I was thinking along the same lines at first, noting that if you measure
>>>from the center of each box to the fulcrum, the the distance ratio appears
>>>to be 5:1
>>
>>Not "appears to be". Is.
>
>HUH???
>
>I see two triangles point down.
>center of mass _is_ the same as the point of contact with the lever.
>The lever is already marked in uniform segments.
>
>The one on the left is _two_ segments out from the fulcrum
>The one on the right is _six_ segments out from the fulcrum.
>
>How in name of {something} do you come up with anything other than 3:1??
Simple: they changed the picture between then and now, presumably in response
to numerous complaints that their answer was wrong. At the time HDRDTD and I
posted, the picture looked something like this (view in a fixed-space font):
___ ___
| | | |
|___| |___|
-- -- -- -- -- -- -- --
/\
/__\
As illustrated, the centers of mass are at 1 unit, and 5 units, distant from
the fulcrum.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.
In article <[email protected]>, "Charlie M. 1958" <[email protected]> wrote:
>Phisherman wrote:
>> On Wed, 24 Oct 2007 00:12:15 -0000, Robatoy <[email protected]>
>> wrote:
>>
>>> On Oct 23, 8:04 pm, [email protected] (Doug Miller) wrote:
>>>> In article <[email protected]>, Tom Veatch wrote:
>>>>
>>>>> missed the planetary gear direction, matching up the description
>>>>> (reverse, reduction, etc.) with the gear pictures, and the fan blowing
>>>>> on the fan.
>>>> The fan blowing on the fan is an ambiguous question. They're facing each
>>>> other, and spinning the "same" direction, in the sense that when viewed from
>>>> the side, they're both spinning down on the edge facing you (or up, depending
>>>> on which side you're on). But when each one is viewed from *its*own* front,
>>>> one is spinning clockwise, and the other counterclockwise.
>>>>
>>>> So is that the same direction? Or the opposite direction?
>>> Both blades rotate in the same direction regardless of vantage point.
>>> You stand behind one fan, and both blades turn clockwise. You stand
>>> behind the other, both blades turn anti-clockwise. What on earth is so
>>> hard about that, oh wise one?
>>
>>
>> The confusion is "same direction" and where the observer stands when
>> evaluating the direction of each fan. Part of this test is
>> understanding the question. I should have got a perfect score with my
>> background and education, but did not. I excel at engineering and
>> math, but English comprehension is another story.
>
>You could look at it this way: The fan that is running is turning in its
>normal direction, and the fan that is not running is turning opposite of
>its normal direction. Therefore, they are turning in opposite
>directions. This reasoning makes the most sense to me, because it takes
>point of view totally out of the equation.
But according to the testmakers, that's the "wrong" answer. :-)
Without knowing what frame of reference is intended by the testmaker, it's not
possible to determine which answer is "correct".
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.
On Wed, 24 Oct 2007 00:12:15 -0000, Robatoy <[email protected]>
wrote:
>On Oct 23, 8:04 pm, [email protected] (Doug Miller) wrote:
>> In article <[email protected]>, Tom Veatch wrote:
>>
>> >missed the planetary gear direction, matching up the description
>> >(reverse, reduction, etc.) with the gear pictures, and the fan blowing
>> >on the fan.
>>
>> The fan blowing on the fan is an ambiguous question. They're facing each
>> other, and spinning the "same" direction, in the sense that when viewed from
>> the side, they're both spinning down on the edge facing you (or up, depending
>> on which side you're on). But when each one is viewed from *its*own* front,
>> one is spinning clockwise, and the other counterclockwise.
>>
>> So is that the same direction? Or the opposite direction?
>>
>> --
>> Regards,
>> Doug Miller (alphageek at milmac dot com)
>>
>> It's time to throw all their damned tea in the harbor again.
>
>Both blades rotate in the same direction regardless of vantage point.
>You stand behind one fan, and both blades turn clockwise. You stand
>behind the other, both blades turn anti-clockwise. What on earth is so
>hard about that, oh wise one?
The confusion is "same direction" and where the observer stands when
evaluating the direction of each fan. Part of this test is
understanding the question. I should have got a perfect score with my
background and education, but did not. I excel at engineering and
math, but English comprehension is another story.
Not bad for an "Old Mechanic" who learned from the school of hard
knocks, and my Dad. I started pulling wrenchs at the age of 5 in my
Dad's shop.
Score of 460 %92
Joe AutoDrill wrote:
> Was posted in alt.machines.cnc... But doesn't seem to have migrated over
> here yet...
>
> http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> I scored a 430...
>
> I've got the unfair advantage over some of you of being trained here on the
> job... But never had schooling in most of this so...
>
> Share your score with us... No shame or bragging rights, just a fun test.
>
> Regards,
> Joe Agro, Jr.
> (800) 871-5022
> 01.908.542.0244
> Automatic / Pneumatic Drills: http://www.AutoDrill.com
> Multiple Spindle Drills: http://www.Multi-Drill.com
>
> V8013-R
>
>
>
On Tue, 23 Oct 2007 16:59:45 -0400, "HDRDTD" <[email protected]> wrote:
>Again, this one is debatable as both 'Suction' and 'Atmospheric Pressue' are
>valid answers.
I think this one's reasonable - it's multi-choice, you do know that it's
one of the answers, and _only_ one of the answers. With that extra
axiom, the answer is clearly "atmospheric pressure" rather than
"cylinder suction".
Given what I learned from the balloons question, I think it's actually
local variations in non-constant air pressure between cylinders...
--
Cats have nine lives, which is why they rarely post to Usenet.
This one triped up every engineer here that has taken the test so far.
I was thinking along the same lines at first, noting that if you measure
from the center of each box to the fulcrum, the the distance ratio appears
to be 5:1 but that results in an answer of 60kg, and that ain't an option
given.
However....
If you look at it as each box sites on two segments, and count that way, or
in other words if each segment was shown as the width of a box, the the
ratio appears as 3:1 which provides the correct solution.
"Chip Buchholtz" <[email protected]> wrote in message
news:[email protected]...
> Joe AutoDrill <[email protected]> wrote:
> : Was posted in alt.machines.cnc... But doesn't seem to have migrated
> over
> : here yet...
>
> : http://www.forddoctorsdts.com/quizzes/MechanicalAptitude.php
>
> : I scored a 430...
>
> I scored a 420, and I think their answer for question 31 is wrong. I
> measured from the center of gravity of the load to the fulcrum, and
> they measured from the outer edge of the load to the fulcrum.
>
> I emailed them about it, so I'll probably find out that I screwed up.
>
> It's a fun quiz, thanks!
>
> --- Chip
Hoosierpopi <[email protected]> writes:
> Please, if we can't see the answer sheet, don't recommend the test.
You can see the answer sheet. Read the past posts; there are at least
two ways to do so. Of course, finding them is part of the test ;-)
Andy Dingley <[email protected]> writes:
> Anyone found the full set of correct answers yet? I'm too busy just at
> the minute, but it would be interesting to see them.
After you're done, you can review the results and see the right
answers, and which you got wrong. Use the poorly-labeled magnifying
glass icon.
"Chip Buchholtz" <[email protected]> writes:
> : I scored a 430...
I got a 480.
> I scored a 420, and I think their answer for question 31 is wrong.
> I measured from the center of gravity of the load to the fulcrum,
> and they measured from the outer edge of the load to the fulcrum.
Right, the correct answer is 60. Not seeing that as an option, I
figured out how they measured it and chose their answer.
Also the question about naturally aspirated pistons was ambiguous.
There were two correct answers, depending on your point of view. The
retreating piston creates a lower pressure inside the cylinder, but
one could argue that both the retracting piston *and* the natural
atmospheric pressure work together to force air into the cylinder.
They marked that one wrong, but I knew I had a 50/50 chance.
I got the balloon one wrong, but I think they're wrong, or at least
ambiguous. For the baloons to be different sizes in the same air
space (as shown), they have to be of different composition, so they
all are in the "same air" and thus atmospheric pressure (PSI) is the
same (14psi at sea level, for example) but the balloons themselves
exert varying pressures on the gasses therein. Had they asked which
had the highest pressure INSIDE the balloon, I would have gotten their
answer. Unless they meant TOTAL pressure exerted by the atmosphere,
in which case they should have asked for that (and in which case, the
contents of the balloons is irrelevent). Or if they assume the
balloons have not yet reached steady state, but that wasn't mentioned
in the problem either.
Or maybe I was just over-analyzing it. The picture does show them in
common air, though. Had they drawn lines between the balloons, to
show them possibly in different air pressures, I would have gotten it
right.
Puckdropper <[email protected]> writes:
> That makes a LOT more sense. I'll have to breadboard it to see what
> actually happens...
Even if the switch has a non-zero resistance, the voltage across it
and the light will be so low that the bulb won't have enough power to
produce any visible light.
But to simplify...
Consider each bulb has a 10 ohm resistance, and it's a 10 volt
battery. One light = one amp. Two lights in series = 20 ohms = 0.5
amps, which each light sees. Two lights in parallel = 5 ohms = 2
amps, split between the lights = 1 amp each. Assume the switch is
0.01 ohms (they're usually much less).
So with one bulb in parallel with the switch, and a second in series
with those two, the MOST current you'll get is 1 amp (just the second
light alone limits it to that). If the switch is closed, 1 amp
through it is 0.01 volts. That's the most voltage that will be across
the switch/light combo. 0.01 volts divided by 10 ohms (the first
light) gives 0.001 amps (1 milliamp), far less than the 1 amp it's
expecting.
To figure exact values, consider:
V1 V2
*---\/\/\/\----+-----\/\/\/\/----+ 0v
--> R1 | R2 |
I +-----\/\/\/\/----+
R3 |
---
R2 and R3 in parallel give 1/(1/R2+1/R3) ohms. Let's call this R23.
V1 V2
*---\/\/\/\----+-----\/\/\/\/----+ 0v
--> R1 R23 |
I |
|
---
Total resistance between V1 and 0v (ground) is thus R1+R23.
Current is V1/(R1+R23). Call this I.
Voltage at V2 (relative to 0v) is I*R23
Current through R2 is V2/R2.
Current through R3 is V2/R3.
For our simplified example, rounded to three sig digits...
V=10 R1=10 R2=10 R3=0.01
R23 = 1/(1/10 + 1/0.01) = 0.00999 ohms
I = 10/(10+0.00999) = 0.999 amps
V2 = 0.999 * 0.00999 = 0.00998 volts
Current through R2 = 0.00998 / 10 = 0.000998 amps
Current through R3 = 0.00998 / 0.01 = 0.998 amps
In article <[email protected]>, Tom Veatch wrote:
>
>missed the planetary gear direction, matching up the description
>(reverse, reduction, etc.) with the gear pictures, and the fan blowing
>on the fan.
The fan blowing on the fan is an ambiguous question. They're facing each
other, and spinning the "same" direction, in the sense that when viewed from
the side, they're both spinning down on the edge facing you (or up, depending
on which side you're on). But when each one is viewed from *its*own* front,
one is spinning clockwise, and the other counterclockwise.
So is that the same direction? Or the opposite direction?
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.