mech2100_prac_exam_Q_A1

# mech2100_prac_exam_Q_A1 - MECH2100 Practice Final Semester...

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MECH2100 – Practice Final Semester Examination, Semester Two 2007 Page 1 of 7 VENUE: SEAT NUMBER: STUDENT NUMBER: Practice EXAMINATION St Lucia Campus Internal Second Semester, 2007 MECH2100- Machine Element Design PERUSAL TIME 10 Mins. During perusal, write only on this exam paper WRITING TIME 120 Minutes EXAMINER Professor Hal Gurgenci NO. OF PAGES ( include title page and attachments ) 7 Pages - Double-Sided Exam Type: Closed Book - No materials permitted Calculator - Yes - Any type of calculator is permitted Dictionary - Yes - Any unmarked paper dictionary is permitted Other – No electronic aids are permitted (e.g. laptops, phone) Permitted Materials: Answer: Use the computer forms for the multi-choice questions (Questions 1-10). Use the provided booklet for the Design Question (Question 11). Number of Questions: 10 multi-choice questions + 1 design question Weighting/Marks: Marks as indicated - 100 marks total. Special Instructions: Students must comply with the General Award Rules 1A.7 and 1A.8 which outline the responsibilities of students during an examination.

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MECH2100 – Practice Final Semester Examination, Semester Two 2007 Page 2 of 7 MECH2100 2007 Practice Final Exam Q1 (5 marks) A strain gauge is placed on the surface of a solid cantilever steel beam of circular cross section with a diameter of 150-mm at angle of 45 o to the axial direction as shown. Two parallel 100-kN forces are acting at the free end, 200-mm above and below the centre line, respectively. The forces are equal in magnitude but opposite in direction. What is the expected value of strain as microstrains to be measured at the gauge? (Hint: In a biaxial stress field, the principal strains are related to the principal stresses as () 12 1 1 E σ νσ ε = (a) 292 (b) 379 (c) 204 (d) 583 (e) 412 Q2 (5 marks) Which of following is true? I. Using Tresca’s failure criterion, a steel component should be expected to fail when its maximum shear stress exceeds 50% of the yield strength determined by uniaxial tension tests.
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mech2100_prac_exam_Q_A1 - MECH2100 Practice Final Semester...

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