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Old 18-10-2007, 16:24   #1
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Mechanical Aptitude Test

Many companies and trade schools will administer aptitude tests to determine if a particular job or career is suitable for you. Mechanical aptitude tests do not measure what you know, but rather your ability to learn about and understand mechanical concepts and how things work. The questions in our test are based on some widely known and understood mechanical and scientific concepts taken from real tests and some designed to reflect things found in the Power Stroke World. This test is presented for fun and not to represent any official measure or analysis. This is a fifty question un-timed test. Depending on your connection speed it may take a little time to load. Are you ready?

Ford Doctors Diesel Technician Society


I got 94%, #26, 44 & 48 wrong! Duh!
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Old 18-10-2007, 17:42   #2
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Was 48 the naturally aspirated engine for you? That was getting pretty semantically picky, which I guess should have been picked up on by the atmospheric pressure pushing the gas in answer.

They got one wrong altogether. It was the brake piston question. They applied a "force" of 50 psi to the 14 sq. inch piston and said the force on the 2 sq. inch piston was 350 psi. Psi is pressure, not force. The pressure in the brake lines is equal everywhere. If you apply 50 lbs of force to a piston with 14 sq. inches of area, you generate 3.57 psi in the line. This pressure pushing on a 2 sq inch piston will generate 7 lbs of force.

I thought that several of the questions were not aptitude questions, but knowledge questions. Anyway I missed 6.

John
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Old 18-10-2007, 17:53   #3
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ACK!!....I failed....72%.....
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Old 18-10-2007, 19:35   #4
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Damn!

76% I wasn't happy with the results. I'm glad I already have the job. Anyone need any work done?
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Old 18-10-2007, 20:45   #5
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Question 31...

Is it just me or are none of the answers to Q31 correct?
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Old 18-10-2007, 21:12   #6
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Is it just me or are none of the answers to Q31 correct?
There's two bars on one side and 6 on the other side on the lever, so a 3:1 ratio. So Box B has to weigh 1/3 of A, or 100 kg. You have to assume all the weight is at the ends of the lever, not centered in the middle of each box, which would give a 5:1 ratio for which there is no right answer. Kind of sloppy after being so picky on some of the others.



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Old 18-10-2007, 21:31   #7
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Never look back. 88 for me. I was an administrator not a mechanic. Maybe I can get a job with Ford? That was fun.
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Old 18-10-2007, 21:40   #8
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Hey, it's the crazy 88's! Me too. Serves me right for trying that at the end of the work day. When I looked back, what I missed were stupid mistakes. Hard to figure out which way gears turn when the ones in you brain are froze up
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Old 18-10-2007, 22:01   #9
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Got an 86... 48 is wacky, what naturally aspirated engine doesn't have some manifold vacuum?

I need to work on my pulley math, and revisit circuits. Series-parallel... huh?
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Old 18-10-2007, 22:14   #10
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I got 94 %. Does that mean I can sleep soundly in my boat and convince myself that I have done everything almost right? And that when I start out in the morning the anchor windlass will turn in the right direction and the anchor will come up, the stars will be in alignment and all will be right with the world. Boy is that a load of my mind.LOL
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Old 18-10-2007, 23:56   #11
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Quote:
Originally Posted by cal40john View Post

They got one wrong altogether. It was the brake piston question. They applied a "force" of 50 psi to the 14 sq. inch piston and said the force on the 2 sq. inch piston was 350 psi. Psi is pressure, not force. The pressure in the brake lines is equal everywhere. If you apply 50 lbs of force to a piston with 14 sq. inches of area, you generate 3.57 psi in the line. This pressure pushing on a 2 sq inch piston will generate 7 lbs of force.
50 pounds per square inch acting on 14 square inches is 700 pounds of pressure. 700 pounds of pressure acting on 2 square inches is 350 pounds per square inch. They are both pressure. One is total and the other is per unit.

There is no force. F = MA. There is no acceleration or mass given in the problem.

I prefer not to say my score.
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Old 19-10-2007, 02:29   #12
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50 pounds per square inch acting on 14 square inches is 700 pounds of pressure. 700 pounds of pressure acting on 2 square inches is 350 pounds per square inch. They are both pressure. One is total and the other is per unit.

There is no force. F = MA. There is no acceleration or mass given in the problem.

I prefer not to say my score.
Sorry, you're wrong about the force, but the math is right. You just multiplied 50 lbs/in sq. times 14 in sq. Using dimensionalysis, (in sq.)/(in sq.) = 1, units left are lbs. There are 700 lbs of force being applied. When you initially push on the piston it moves, when the force on the other other side balances, the motion stops. Net force is zero, but this doesn't mean that all the forces disappear. Look up statics. Also pressure is defined as force per unit area normal to the surface. Once you divide out area, you're left with force.

You did make me see how I looked at the picture wrong though. I made it a 14 sq. in. disk on top and a 2 sq. in. disk on the bottom with a fluid in between, so applying pressure made no sense. I now see that the problem is a 14 sq. in. tube that reduces to a 2 sq. in. tube that has a stepped piston in it. Is that used anywhere in real life?


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Old 19-10-2007, 05:48   #13
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I actually passed this test:

1) Who won World War II, and who finished second?

2) Explain Einstein’s "Theory of relativity", or write your name in capital letters!

3) How many commandments where handed to us by Moses (approximetly!)

4) England had 6 Kings named Georg. The last was George VI. Name the others!

5) Do you understand Newtons "Law of gravitation". Answer with Yes or NO!

6) Which person does not fit the pattern?
a. The Pope
b. Martin Luther
c. Jack the Ripper
d. Jesus

7) Vasco da Gama set sail for 3 journeys. On one of them he died. Which one?
a. the first
b. the second
c. the third

8) Who build the great Pyramid of Giza?
a. Blackwater USA
b. The Pharaos
c. Lego

9) What is the starting time of the 10 óclock news
a. 9́óclock
b. 10 óclock
c. 11 óclock

Extra question to collect additional points if you think you haven`t done well so far!

Here's a list of the countries that the U.S. has bombed since the end of World War II:
China 1945-46
Korea 1950-53
China 1950-53
Guatemala 1954
Indonesia 1958
Cuba 1959-60
Guatemala 1960
Congo 1964
Peru 1965
Laos 1964-73
Vietnam 1961-73
Cambodia 1969-70
Guatemala 1967-69
Grenada 1983
Libya 1986
El Salvador 1980s
Nicaragua 1980s
Panama 1989
Iraq 1991-99
Sudan 1998
Afghanistan 1998
Yugoslavia 1999

In how many of these instances did a democratic government, respectful of human rights, occur as a direct result? Choose one of the following:
(a) 0
(b) zero
(c) none
(d) not a one
(e) zip
(f) a whole number between -1 and +1
(g) zilch
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Old 19-10-2007, 10:08   #14
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Gord, I like your test waaaay better. I assume 50% is passing? I'm still not sure of the answer on the last one. I'm trying to use that pressure vs. force equation and there are just too many variables with China on the list twice.
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Old 19-10-2007, 13:14   #15
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96 percent!
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