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MIME Practice Exam Fall

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MIME Practice Exam Fall Powered By Docstoc
					MIME 3300                      Exam 1                            Spring 2008
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1) (35 points) Using an algebraic approach find the angle of the crank
   relative to the horizontal, 2, and the distance d. Show all your
   derivations. All angles are in degrees and the lengths are in inches.



                               A
                                         Connecting
                                         rod, b=3               Slider
               Crank,
                                                                    3 = 1500
               a=2
                          2                                             O4
                 O2

                                          d


2) (30 points) Solve problem 1 using a graphic approach. Draw the
   mechanism and explain all steps.


3) (35 points) Answer to the following questions briefly (up to 100 words).
Do not justify your answers to true-false questions (Marked T-F). However,
you can do so if a true-false question is vague or ambiguous in your
opinion.

   a. Grashof condition is satisfied for the following 4-bar linkage. (T-F)

                               link 3, 90 mm

                                                  3
                                                            link 4, 40 mm
          link 2, 30 mm


                          2                                   4




                                   link 1 (ground), 70 mm


   b. A full joint constrains two degrees of freedom. (T-F)
   c. A structure has zero degrees of freedom. (T-F)
   d. We are performing position analysis of a four-bar linkage. There are
      two solutions; an open and a crossed solution. The solution shown
      below is the crossed solution. (T-F)
e. We want to construct a mechanism consisting of a single link to
   move a link thought two positions A1B1 and A2B2 as shown below.
   The center of rotation of the link is the intersection of the normal
   bisectors of A1B1 and A2B2. (T-F)
                  B1


                                     B2
       A1
                       A2




f. In question e, the center of rotation of the link is the intersection of
   the normal bisectors of A1A2 and B1B2. (T-F)
g. In question e, there is a unique four-bar mechanism that can
   accomplish the task of moving the link through the two positions
   shown. (T-F)
h. Consider a crank-slider mechanism. The crank rotates
   counterclockwise. The time ratio is equal to one. (T-F)


                  A
                            Connecting
                            rod                Slider
       Crank                                        3
                       2



                            d



i. The crank-slider mechanism above has one degree of freedom. (T-F)
j. The stroke of the crank-slider mechanism above is equal to two times
   the crank length. (T-F)

				
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