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MIT2_007s09_exam02A

# MIT2_007s09_exam02A - MIT OpenCourseWare http/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 2.007 Design and Manufacturing I Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Page 1 of 10 2.007 Design and Manufacturing I Draft Exam on Gears, Springs, Mechanisms, and Drawing This is a practice exam. On the real exam, you ’ll have 1.5 hours to answer about 7 questions. This exam is somewhat longer and would take about 2.5 hours by my reckoning. Point allocations (out of 100 total) are listed for each question based on what they’d be worth on the real exam . So, this practice exam adds up to about 160 points. 1. (10 points) Define the term “hysteresis . Explain its significance for se nsors and for energy storage elements (e.g. rubber bands). 2. (10 points) You fill a one liter container with air at 60 psi gauge pressure and plan to use it as a source of power for a machine. The air in the bottle is at thermal equilibrium with the air in the room at 20 degree Centigrade. Estimate the force applied if a valve is opened connecting the reservoir of air to a piston with a three inch internal diameter and a four inch throw.
Page 2 of 10 3. (20 points) Sketch the mechanism in a position that places it in static equilibrium. Assume the joints have negligable friction. The drawing is scaled properly in all dimensions so you can estimate any dimensions you need from the figure.

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