MIT2_007s09_exam01B

# MIT2_007s09_exam01B - 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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2.007 – Design and Manufacturing I Practice Exam on Drawing, CAD, Motors, Pneumatics, and Mechanisms This practice exam is intended for a 1.5 hour period. It has 8 problems and 100 points total. NOTE: These are problems we made up and decided not to use on the exam in this form. We thought maybe they were not as clear as we wanted or didn’t match our objectives perfectly. So, this practice exam is not quite representative, but practicing on imperfect problems is better than not practicing. 1. (20 points) A vehicle is composed of a box shaped structure with permanent magnet DC motors placed at all four corners and driving all four wheels (each through a gear train). All these motors are attached to a 5V NiCad battery pack. The coefficient of static friction between the wheels and the surface is 0.5. The vehicle starts from a stand still on level ground. The stall torque is 0.3Nm and the no load speed os 50rpm. The vehicle weight is 1N and the wheels are fairly hard. a) (5 pts) Draw a torque speed curve for the motor.
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## This note was uploaded on 02/23/2012 for the course MECHANICAL 2.007 taught by Professor Fry during the Spring '11 term at MIT.

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MIT2_007s09_exam01B - MIT OpenCourseWare http:/ocw.mit.edu...

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