### Answers to ME Review Questions in Strength of Materials

Answers to the questions on Strength of Materials.
1. In the cross section of a shaft subjected to torsion, the stress is maximum at what location?
C. At the surface of the shaft
- The shear stress increases from the center (zero stress) to the outer(maximum stress).
- Application: Hollow shaft is a good replacement for solid shaft since only the less stressed portion (the center) is removed.

2. The stress experienced by a body under torsion is…
A. Shear stress

3. The stress experienced by a pressurized vessel is…
C. Tensile stress
-pressure tends to pull (tension) the shell of the vessel

4. The “Maximum Shear Theory”, one of the known theories of failure is also known as…
B. Guest’s theory

5. In the stress-strain curve, it is the point at which there is an appreciable elongation without corresponding increase in load.

D. Yield point

6. What will happen to the stress in a shaft under torsion if the diameter was decreased to half the original?
C. The stress will be increased eightfold
-stress, s=16T/pi(D^3), when you decrease the diameter to half the stress will be multiplied by eight (2^3=8)

7. What will happen to the stress of a body under compression if the force applied to it was doubled?
A. The stress will increase to twice the original
-stress, s = F/A, when, force F is doubled, the stress is also doubled.

8. Bending is actually a combination of two types of stresses…
C. Compression and tension

9. The Mises yield theory of failure is best applied to what type of materials?
B. Ductile materials

10. The slope of the line before the proportional limit in a stress-strain curve is also known as…
C. Modulus of elasticity

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### PAST MECHANICAL BOARD EXAM QUESTION: Machine Design Set-1 (solutions and answers)

The following are the solutions and answers to MODIFIED PAST MECHANICAL BOARD EXAM QUESTION: Machine Design Set-1 posted on this blog last Saturday, November 14, 2009. Again, I want to stress out that most of the questions here are modified from its original form for the purpose of improving the question. Past Mechanical Engineering Board Exam Question Number 1 A 4 inches diameter short shaft carrying 2 pulleys close to the bearings transmits how much horsepower if the shaft makes 120 rpm. A.200HP               B. 199 HP C.198 HP               D. 202 HP P = (D3N )/38 -- for mula for short shafts from PSME code P = (4)3(120)/38 P= 202 HP Past Mechanical Engineering Board Exam Question Number 2 An instrument that measures the hardness of the work piece in terms of elasticity. a. Durometer b. Scleroscope c. Mohs's Scale d. Brinell Tester Source: Machinery’s Handbook

### SOLUTION TO MECHANICAL BOARD EXAM PROBLEMS: Power Set-1

Here are the solutions to board problems given at Power Subject Set-1. If you do not understand anything, feel free to write a comment voicing out your concern. I'm still looking for better ways to present my solution. I still don't know how to present equations and mathematical symbols with blogger. Please bear with me. 1. An automobile tire is inflated to 32psig pressure at 50 degree F. After being driven, the temperature rises to 75 degree F. Determine the final gage pressure assuming the volume remains constant. (Electrical Engineering Board Exam Problem) Solution: Since volume is constant, use Charles’ Law on constant volume processes. P1/T1=P2/T2 Note: P and T should be absolute. (32+14.7)/ (50+460) =P2/ (75+460) P2=48.99 psia Converting back to gage pressure, P2g=48.99-14.7 P2g=34.29 psig 2. Four hundred cubic centimeters of gas at a pressure of 740 mmHg absolute and temperature of 18 degree C undergoes a process until the pressure and temperature be

### BOARD EXAM TIP: Which Review Center?

First of all, I would like to apologize for a long time I haven't posted anything but introduction. The reason for that is I'm busy optimizing the design of this site. I'm hoping that the make over is good. Anyway, I would like to dedicate this article to those who are going to take/retake the board exam this coming October. My sincere wish that you bring out the best among yourselves and may the deserving ones pass the exam. Going back to the One-Million-Peso worth question: "Which review center should I enroll?" , I would like to answer that in the most unbiased way I can. Of course, I'm only human and I had also my preferences but I will try my best to hide it. To start with I will enumerate some of the prominent review centers that offer board exam reviews for mechanical engineering in the Philippines. 1. Alcorcon (Cebu & Manila) 2. Excel (Cebu & Manila) 3. Linx Engineering (Manila) 4. MERIT (Manila) 5. PRIME (Cebu) 6. RLB's