In today’s engineering environment “scales” (the triangular plastic or wood instruments) are rarely used. however setting proper units of measurement and plotting to scale has not changed since computer aided drafting has come on the scene. list examples of how to set units and dimension variables for imperial and metric drawings, precision, text height, arrow sizes, etc.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Burgers vector is generally parallel to the dislocation line. a)-true b)-false