Mechanical Aptitude test

Ok I got a 74% on first try, with no help.
What did you get Shotgun?

I also did not pass, got a f*cking 72 and I was guessing on a whole bunch of them. Good, now I do not feel so bad. There needs to be more electronics….. I will try again

i got 86. probably luck!

I got 62%. I guess i am not qualified to change the oil in my car. Chuck

78% for me, fun test though.

94% first and only time. I think I could argue myself out of the ones I think I got wrong. Really, no lies. I imagine I would have tested quite differently before trade school.

Blaine

Great test. 96

84, but it made me stop and think about a few of them.

82 - pulleys and weights had me guessing.

Larry

I retook the test and reviewed the quiz. I think question 48 is wrong. It states that in a normally aspirated engine what causes the air fuel mixture to enter the cylinder?? The answer was atmospheric pressure causes it to enter the cylinder,???? I always thought the suction caused by the pistons downstroke created a vacum to fill the cylinder???? The test said I was wrong. I passed with a 80 this time! LOL. Larry a couple of the answers for weights and pullies had me wondering they did not make sense to me. Wish I had my machinery hand book at home.
Jeff

quote:

It states that in a normally aspirated engine what causes the air fuel mixture to enter the cylinder?? The answer was atmospheric pressure causes it to enter the cylinder,???? I always thought the suction caused by the pistons downstroke created a vacum to fill the cylinder????

Yeah this one is really a matter of semantics; I always remember my High School Physics teacher, drilling us on there's no such thing as 'suction'. The piston does indeed create a reduced pressure zone (vacuum) but the atmosphere (higher pressure zone) is said to do the work. The easiest way to think of it is if the piston (cylinder vacuum) actually did the work there would be no change in peformance with altitude as it does exactly the same independent of altitiude, however atmospheric pressure changes with altitude that's why there is about a 3% HP drop per 1,000 ft elevation gain.

2nd time.....82 %,,,, pulley's/gear ratios got me, have to break out the books...I'm going to make my wife take it

...You Guys must have been asleep in physics class!! There IS NO SUCH THING AS 'VACUUM'!!!! You can't say Here in this jar I have a Vacuum! Because there is nothing there! Zero! And when You try to 'plug' that into an equation; You come up with Zero! There IS an 'Absence of Atmospheric Pressure'! When the Piston moves down IT creates a SPACE that the Atmospheric Pressure rushes in to FILL...

Just curious Marlin, so whats the trick to making a jar of water boil at room temp??
Jeff

quote:

Originally posted by MARLIN JACK:
...You Guys must have been asleep in physics class!! There IS NO SUCH THING AS 'VACUUM'!!!! You can't say Here in this jar I have a Vacuum! Because there is nothing there! Zero! And when You try to 'plug' that into an equation; You come up with Zero! There IS an 'Absence of Atmospheric Pressure'! When the Piston moves down IT creates a SPACE that the Atmospheric Pressure rushes in to FILL...

So the next time I try to find a "Vacuum" leak in a "vacuum" line, I should first check the component labeled "Absence of atmospheric pressure" line?

Yes. Check for negative (-) atmospheric pressure measured in inches of mercury.

90% for me and I didn't even bring the teacher and apple.

Mark #3461

86 I'm ashamed to say considering I have a mechanical engineering degree from a top 5 engineering institute. I agree with others on 48. Semantics. Also, you'd think I had never seen a pulley before.

84 with 2 dumb errors. the electrical ones got me. I wish they would have given an explanation of the answers.

JEFF6559,
What questions? I'm sure you'd get plenty of input here to provide an explanation.

76 - Got close anyway! Fun Test.

94- How do you tell which one(s) you missed?

74 to late to think

98, always was good at tests, I suck with cars though.

80%.
Just passed.
That got the old brain thinking!

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What questions? I'm sure you'd get plenty of input here to provide an explanation.

I missed 24, 25, 26. I can't recall ever hearing the term series-parallel?

quote:

How do you tell which one(s) you missed?

Click the icon in the bottom left corner.

Im just curious here...So George how did you do??
Jeff

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Originally posted by JeffS:
Just curious Marlin, so whats the trick to making a jar of water boil at room temp??
Jeff

To 'Boil' a jar of water at room temp, put the jar in a 'Bell Jar' and remove the 'Atmospheric Pressure'. The water will 'Look' as if it were Boiling but it is not boiling from being heated-up; it is merely the RELEASE of the air molecules that were compressed into the H2O under the PRESSURE of Our ATMOSPHERE. Those who Do Not Know, Think that the water is Boiling...

quote:

Originally posted by ParaPantera:

quote:

Originally posted by MARLIN JACK:
...You Guys must have been asleep in physics class!! There IS NO SUCH THING AS 'VACUUM'!!!! You can't say Here in this jar I have a Vacuum! Because there is nothing there! Zero! And when You try to 'plug' that into an equation; You come up with Zero! There IS an 'Absence of Atmospheric Pressure'! When the Piston moves down IT creates a SPACE that the Atmospheric Pressure rushes in to FILL...

So the next time I try to find a "Vacuum" leak in a "vacuum" line, I should first check the component labeled "Absence of atmospheric pressure" line?

Yes!! The Hissing You hear as a Leak is Atmospheric Pressure rushing 'IN' to fill the SPACE that has been created when the Pistons Move Down in Their Bores! See! Your 'Getting IT'!!...

quote:

Originally posted by PanteraDoug:
Yes. Check for negative (-) atmospheric pressure measured in inches of mercury.

Doug! You Have it Right-On!! And the Hg is PUSHED up that tube 29 to 31 Inches, Because the Atmospheric Pressure is Pushing DOWN on the RESERVOIR of Murcury! Thank-You...

quote:

Originally posted by MARLIN JACK:
...You Guys must have been asleep in physics class!! There IS NO SUCH THING AS 'VACUUM'!!!! You can't say Here in this jar I have a Vacuum! Because there is nothing there! Zero! And when You try to 'plug' that into an equation; You come up with Zero! There IS an 'Absence of Atmospheric Pressure'! When the Piston moves down IT creates a SPACE that the Atmospheric Pressure rushes in to FILL...

I guess my point being is that there is such a thing as Vacuum. We have the vacuum of space, vacuum lines, and vacuum pumps. What you give in the above statement is the "definition" of what vacuum is.

It is like saying there is no such thing as water, it does not exist, but I do shower with hydrogen and oxygen.

...I guess Your one of those 'Guys' who needs to have a Picture Drawn for them! The Point IS the Term 'Vacuum' Stands for NOTHING! There is Nothing There! A Jar minus Atmospheric Pressure is a Jar Full of Nothing!! And That's the last I have to Say on the Subject...

quote:

Originally posted by MARLIN JACK:
A Jar minus Atmospheric Pressure is a Jar Full of Nothing!! ...

I will be sure to remember that the next time I crack open a brand new jar of strawberry preserves ;-)

[/QUOTE] To 'Boil' a jar of water at room temp, put the jar in a 'Bell Jar' and remove the 'Atmospheric Pressure'. The water will 'Look' as if it were Boiling but it is not boiling from being heated-up; it is merely the RELEASE of the air molecules that were compressed into the H2O under the PRESSURE of Our ATMOSPHERE. Those who Do Not Know, Think that the water is Boiling...[/QUOTE]

Actually, this is not totally accurate. If you lower the pressure enough, the water will actually boil as in change states from a liquid to gas. Here are a few boiling points for water in a vacuum:

212F - 0Hg
72F - 29.12Hg
-70F - 29.9195Hg

So H20 gas will form at -70 degrees F if you lower the pressure enough.

quote:

Actually, this is not totally accurate. If you lower the pressure enough, the water will actually boil as in change states from a liquid to gas. Here are a few boiling points for water in a vacuum:

212F - 0Hg
72F - 29.12Hg
-70F - 29.9195Hg

So H20 gas will form at -70 degrees F if you lower the pressure enough.

Thats why people who live at higher altitudes have to "boil" tea, coffee, etc longer to get it hot.
Jeff