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MD six min solutions


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#1 r_mojo1

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Posted 23 March 2012 - 04:00 PM

Is anybody using the six min solutions for MD. I have the fluids and thermal and think is ok. Let me know if you want to trade questions.


#2 Krakosky

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Posted 23 March 2012 - 04:46 PM

I didn't end up getting it bc the reviews for it were so bad. Some people said they found it useful tho. For me, it would be too frustrating working thru problems that were filled with errors and incorrect solutions.

#3 Master slacker

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Posted 28 March 2012 - 11:32 AM

Since this is your signature...

MUST PASS THE PE....

I'd suggest getting it.

#4 r_mojo1

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Posted 28 March 2012 - 02:00 PM

Since this is your signature...

MUST PASS THE PE....

I'd suggest getting it.


Its getting expensive with all the books i already purchased.

#5 Master slacker

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Posted 29 March 2012 - 11:12 AM

And how much does the test cost each time you take it?

#6 navyasw02

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Posted 01 April 2012 - 10:36 AM

MD 6 min solutions sucks. The problems are exponentially harder than the real thing. The best MD problems I think were in the practice exams.

#7 Krakosky

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Posted 02 April 2012 - 12:28 PM

Good to know. I'll concentrate on the NCEES exams. Although I did buy the 6MS for T/F and HVAC to brush up on some more breadth type problems.

#8 Master slacker

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Posted 02 April 2012 - 04:44 PM

MD 6 min solutions sucks. The problems are exponentially harder than the real thing. The best MD problems I think were in the practice exams.


And that's bad becaaauuussseee... :huh:

#9 WV_Boiler

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Posted 04 April 2012 - 02:45 AM

MD 6 min solutions sucks. The problems are exponentially harder than the real thing. The best MD problems I think were in the practice exams.


I disagree, I thought that 6MS was representative, NCEES practice was slightly easier and Lindeburger was a flippin joke.

I couldn't imagine doing all that studying and expense to not buy one more book. Devour all the info you can afford/get your hands on. however, after I passed, I got to expense everything. If you dont get to expense, I am pretty sure you can at least write it off on your taxes.

#10 Relvinim

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Posted 04 April 2012 - 06:14 PM

I thought the MD 6MS was great practice even though the problems were harder and it had all kinds of errors in the solutions. I can say taking that gave me more confidence than any of the other practice exams I took.

#11 ikesdsu

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Posted 04 June 2012 - 08:23 PM

I borrowed these books from a friend and studied them. I think they were way better than the problems in the practice problem books. The problems were more representitive of what is on the test.

#12 Krakosky

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Posted 05 June 2012 - 12:35 AM

Never got the MD 6MS and apparently didn't need it!

#13 StillNotA PE

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Posted 13 February 2014 - 02:29 AM

Anyone working these? If so let me know your answer to problem 19...I definitely do not agree! I mean really? Their answer is just not logical, IMO.

#14 majormajor

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Posted 14 February 2014 - 08:01 AM

I agree with the solution

 

A = 5e-4 m^2

rho = 8602 kg/m^3

M = .0015 kg

 

V = M/rho = 1.744e-7 m^3

depth = V/A = 3.488e-4 m

 

depth/time = 3.488e-4 m/72h = 4.8438 m/hr = 42460 e-6 m/yr



#15 StillNotA PE

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Posted 16 February 2014 - 11:08 PM

I agree with the solution
 
A = 5e-4 m^2
rho = 8602 kg/m^3
M = .0015 kg
 
V = M/rho = 1.744e-7 m^3
depth = V/A = 3.488e-4 m
 
depth/time = 3.488e-4 m/72h = 4.8438 m/hr = 42460 e-6 m/yr


3.488e-4 m/72 hr = 4.844e-6 m/hr....unless I'm calculating wrong.

I originally got A for the answer, which is much more logical than 42,400 micrometers per year. This equates to about 1670 mils per year....and in the industry I work in, corrosion of about 4-6 mils is typical for "real life" corrosion.

#16 StillNotA PE

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Posted 16 February 2014 - 11:32 PM

I did figure out what I was doing wrong...and I agree with the answer, but it's just a crazy amout of corrosion I think.

#17 CRNewsom

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Posted 17 February 2014 - 04:33 PM

If you don't mind to restate the problem (since I don't have the book), I may be able to shed some light on whether the amount of corrosion is reasonable or not.

#18 StillNotA PE

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Posted 18 February 2014 - 01:29 AM

Problem 19 reads: A nickel plate is tested in a corrosive environment. The density of the nickel is 8602 kg/m^3. A 5 cm^2 sample is exposed for 72 hours and loses 1.5 g. The predicted material loss for the nickel plate in use is most nearly ? micrometers/year.

1.67 inches is equal to the answer of 42,400 micrometers. I think I'd pick another material.

#19 NHale

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Posted 18 February 2014 - 04:20 PM

Was tempted to get 6 minute, but Amazon reviews were horrible. I especially didn't like the part about how thin the book was. Guess I'll find out in April how that worked out for me...

 

NHale



#20 CRNewsom

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Posted 18 February 2014 - 08:42 PM

SMott,

Your answer is correct, 42,432 um/yr. It is possible that the purpose of the problem is to be able to determine if the corrosion rate is acceptable or not. Clearly, it is not, but that is not necessarily evident by the test results.

Industry example: I had a customer request a tank designed for 0.5 psig vacuum. This does not seem like an unreasonable request on its own. However, the tank was to be 170 ft in diameter. I am sure that the problem is evident.

#21 StillNotA PE

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Posted 19 February 2014 - 12:16 AM

NHale...I'm of the mindset of working as many sample exam problems as I can get my hands on.

CRNewsom,
Well you know you are bound to have clients/customers wanting things that are challenging/not doable from time to time.

#22 center*ice

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Posted 19 February 2014 - 02:44 PM

NHale...I'm of the mindset of working as many sample exam problems as I can get my hands on.

CRNewsom,
Well you know you are bound to have clients/customers wanting things that are challenging/not doable from time to time.

 

 

Bingo. You can never work too many sample exam problems or practice problems.  Become familiar with those problems inside and out, particularly the ones involving your afternoon module topic. Like that C&W song by Bobby Pinson says, "Don't ask me how I know!" 



#23 Golden Eagle PE

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Posted 24 February 2014 - 01:34 AM

NHale...I'm of the mindset of working as many sample exam problems as I can get my hands on.

CRNewsom,
Well you know you are bound to have clients/customers wanting things that are challenging/not doable from time to time.

I concur....






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