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Hi, I took the Mechanical (MD) PE exam last October 2010 and passed first time (scored 81). I am selling all my books: - MERM 12th Edition including tabs $120 - Practice problems for the mechanical engineering PE exam, twelfth edition $45 - Dictionary of Mechanical Engineering by GHF Nayler...

We know Delta P friction = rho * f * V^2 / 2 D.gc , the solution says that Delta P friction is proportional to the square of the velocity, but this assumes that the coefficient of friction is independant of the velocity, which is not true. in laminar flows f=64/Re and Re=V.D/kinematic viscisity...

Does anyone knows where the formulas in the solution came from? Thanks, Lily

Does anyone knows what does the box with + 0.005 A B C means? I thought the smallest diameter of the hole is 0.265 and the largest is 0.275. apparently not... Thanks, Lily

When treating welds as lines, I use the outside radius as shown int Appendix 51A in the MERM. Lindeburg uses in his solution of problem 21 of the PE sample exam the inside radius of the weld in the calculation of the area and section modulus. I found 4268 lbf and he finds 3385 lbf. what do you...

In general, how would you recognize which side of a pulley has Fmax or which has Fmin. NCEES 2001 problem 516, I got the wrong answer because I considered the F=100 lb as Fmax. Any quick way to avoid this kind of mistake? Thanks! Lily

To calculate the axial load in a friction drive, this formula was used: F=P*Pi^2/4*(D^2-d^4) , D and d are the major and the minor diameter nad P is the pressure. Anyone knows where this formula came from? Thanks!

Hi everyone, The problem is: Design requierements specify that a cell phone's plastic shell must survive a 6ft fall onto concrete. Static compression tests indicate shell fracture at F=1250 lbf and 0.005 deflection. If a factor of safety 6 is used what is most nearly the maximum allowable phone...

We can take problem 115 in the 2001 sample PE exam as example, we have a pulley that is located at the end of a shaft, the shaft is hold by 2 bearings, and the pulley is not between these bearings. the question is what is the maximum bending stress in the shaft. the answer given in the NCEES is...

I did the Lindeburg PE sample exam (which I found very hard). and on problem 92, afternoon session asks for the minimum diameter of a shaft subject to both a bending moment and a Torque. I arrived to equivalent normal stress=r/J*(M^2+T^2)^0.5. and the solution arrived to...

Hi everyone, I realized that I almost never used Appendix 24F (Properties of low pressure air) while preparing for the MD PE. What kind of problems are we supposed to used this appendix for and what pressure is considered a low pressure for air? Thanks and good luck for your preparation.