MEC410 Midterm 1_Version 1 Answers Spring 2018.docx

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Semester: Spring 2018 Class: MEC 410 Class Name: Design of Machine Elements Class Text: R. L. Mott, “Machine Elements in Mechanical Design”, 6 th edition Instructor: Jay Mendelson Midterm Exam #1 Covering: Chapters 5, 7, 8 and 9 VERSION 1 Section 1: 5 points for each question, short or numerical answers. You must get the entire answer correct to score the 5 points for each question. You must show the calculations for numerical answers. Simply writing an answer into the answer box is not acceptable. (A) A motor is attached to the driving pulley of a V-Belt drive. The motor is rotating at 1725 rpm and the V-belt is moving at 3,500 feet/minute. What is the diameter in inches of the driving pulley? Answer Box: See the calculation below. (B) The available V-belt sizes are given in Table 7-2 from the textbook, shown below. You have determined from the power requirements that you need one 5V belt. If the small V-belt pulley has a diameter of 7 inches, and you need a 3:1 speed ratio between the driving and driven pulley, and your machine needs a pulley center distance of roughly 40 inches, which belt length should you select? Note: Select a belt length that is closest to the one you calculated. Answer Box: Page 1 7.75 inches 125 inches
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See the calculation below.
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