Mechanical Test

**Chaos** · 10-31-2007, 08:29 PM

**Hot Black Trans-Am** · 10-31-2007, 10:09 PM

How many times did you take it?

**Chaos** · 10-31-2007, 11:05 PM

I took it twice, first time I just skimmed through it without much thought and got an 86 I think. Then decided to take it again about an hour later when I saw the thread again, and took my time on it.

BTW, I'm an A.S.E. L1 Master tech, Land Rover Certified Tech, graduated from an Automotive/Diesel Tech school in '94, and been working on cars for a living since I was 18..... So I've taken many various simular tests thoughout the years.

**Chaos** · 10-31-2007, 11:23 PM

the one I missed, and I don't agree with is #48

"In a naturally aspirated, four cycle engine, air enters the cylinder during the intake stroke _______."

A. Because of gravity
B. From the suction caused by the piston going down
C. From atmospheric pressure pushing it in
D. Because of compression

They say the answer is C!???? wtf?

the piston moving down is creating negative air pressure or vacuum. we can't have negative air pressure, so a charge of gas and air comes rushing into the cylinder, By the time the piston arrives at BDC, the air pressure inside the cylinder is equal to the air pressure outside the engine.

so to me, it is a result of both B and C. it's one of those questions that you see on ASE tests sometimes, where 2 answers CAN be correct...but I'm no scientist.

**Hot Black Trans-Am** · 10-31-2007, 11:27 PM

I got that one wrong too. There was a bunch I had to guess sizes of the gears and things on. They looked different than what the really were.

**Hot Black Trans-Am** · 10-31-2007, 11:28 PM

Originally Posted by Chaos

I took it twice, first time I just skimmed through it without much thought and got an 86 I think. Then decided to take it again about an hour later when I saw the thread again, and took my time on it.

BTW, I'm an A.S.E. L1 Master tech, Land Rover Certified Tech, graduated from an Automotive/Diesel Tech school in '94, and been working on cars for a living since I was 18..... So I've taken many various simular tests thoughout the years.

I guess you should have done good then! This is the first time I took a test like that one so I don't think I did to bad.

**Chaos** · 10-31-2007, 11:39 PM

Originally Posted by Hot Black Trans-Am

I got that one wrong too. There was a bunch I had to guess sizes of the gears and things on. They looked different than what the really were.

well, you have to actually count the number of teeth, everything is relative.

**Hot Black Trans-Am** · 10-31-2007, 11:54 PM

ahhh, now you tell me. I thought it was more on the physical size. I guess that makes sense then.

**94z28l** · 11-01-2007, 12:51 AM

Originally Posted by Chaos

well, you have to actually count the number of teeth, everything is relative.

i was doin that, then i realized i'm supposed to be doin homework and online quizes for my actual class and closed out of it

i wanna go back and do it again tho didnt get to finish

**FasstChevys** · 11-01-2007, 07:37 AM

Originally Posted by Chaos

the one I missed, and I don't agree with is #48

"In a naturally aspirated, four cycle engine, air enters the cylinder during the intake stroke _______."

A. Because of gravity
B. From the suction caused by the piston going down
C. From atmospheric pressure pushing it in
D. Because of compression

They say the answer is C!???? wtf?

the piston moving down is creating negative air pressure or vacuum. we can't have negative air pressure, so a charge of gas and air comes rushing into the cylinder, By the time the piston arrives at BDC, the air pressure inside the cylinder is equal to the air pressure outside the engine.

so to me, it is a result of both B and C. it's one of those questions that you see on ASE tests sometimes, where 2 answers CAN be correct...but I'm no scientist.

Yea! No shit! I answered "B"!!!

**FasstChevys** · 11-01-2007, 07:38 AM

Originally Posted by Chaos

well, you have to actually count the number of teeth, everything is relative.

Yep, I was counting teeth.........in some states that's easier than others.

**Tobynine9** · 11-01-2007, 08:20 AM

I got 80%. Pretty sure I botched almost all of the electrical questions. Otherwise, I'm confident.

**Bobby97SS** · 11-01-2007, 02:32 PM

Originally Posted by Chaos

the one I missed, and I don't agree with is #48

"In a naturally aspirated, four cycle engine, air enters the cylinder during the intake stroke _______."

A. Because of gravity
B. From the suction caused by the piston going down
C. From atmospheric pressure pushing it in
D. Because of compression

They say the answer is C!???? wtf?

the piston moving down is creating negative air pressure or vacuum. we can't have negative air pressure, so a charge of gas and air comes rushing into the cylinder, By the time the piston arrives at BDC, the air pressure inside the cylinder is equal to the air pressure outside the engine.

so to me, it is a result of both B and C. it's one of those questions that you see on ASE tests sometimes, where 2 answers CAN be correct...but I'm no scientist.

Sort of a trick question but suction is like dark or cold. It doesnt exist, its the lack of something. (Lack of pressure, abscence of light or heat) Sort of like your gf sucking you, its the lack of something (brains) allowing a higher pressure (yours) to fill the empty space. Simple

**Too Fast** · 11-01-2007, 02:51 PM

82%. I am ok with the passing grade.

**Smkn_TA** · 11-01-2007, 03:58 PM

All the gears were 10 or 20 teeth if I remember correctly...the electrical questions were like beginner beginner beginner questions to. All of it was very simple math. I got worried on that one with the fulcrum and lever where the one weight was far to the left. I got a box afterwards that said, CORRECT!!!, and I thought, hmmm...this is like #31 and I have not got that box all quiz. SHIT!

Seriously though...if you have ever took physics or physical science, you do not even need a calculator for this test.

"In a naturally aspirated, four cycle engine, air enters the cylinder during the intake stroke _______."

A. Because of gravity
B. From the suction caused by the piston going down
C. From atmospheric pressure pushing it in
D. Because of compression

Air moves from areas of high pressure to low pressure...everyone knows that!

**blue02Z** · 11-02-2007, 04:07 AM

i got an 80

**B34M3R** · 11-02-2007, 05:00 AM

The answer was C because, in a standard automotive definition, "suction" does not exsist. There is simply degrees of pressure, the lowest being an absolute vacuum... there is no negitive. So yea, higher pressure equalizes to lower pressure.

But yea, its bullshit, because suction MEANS what happens when a high pressure and a low pressure interact.

**02ultraZ** · 11-02-2007, 05:26 AM

I got an 88% but i would have answered the one question about the 4 cyl. engine wrong but since you guys were talkin about it i picked the right answer...

**Daniel P.** · 11-02-2007, 07:57 AM

Originally Posted by Tobynine9

I got 80%. Pretty sure I botched almost all of the electrical questions. Otherwise, I'm confident.

72% the electrical questions are the only ones that I was sure on, just got out of basic electronics class.

I have never been much of a mechanic just know the basics and physics class kicked my ass in high school

**johnd** · 11-02-2007, 11:04 AM

I got a 90. I think the one with the multiple pulleys did me in. Most of that was just common sense/experience, I think maybe the older you are, the better it might play.