The following question is one that was provided by designers for
the "A" basic level exam.  It is NOT included in the final
published test and is for reference only.  The topic is Grid
Systems.

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102. Which statements are true about the characteristic of a grid 
system?       

     A.   They are bilateral in nature.
     B.   They are unilateral in nature.
     C.   They are basic in their position.
     D.   Their intersecting locations have no tolerances.
     E.   They are located with respect to board datums.
     F.   They describe diameter of true position.

     Select the three most correct answers

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Previous QOD

101. Why are grid systems used for locating components, PTH's,
conductor patterns and other features on printed boards and printed
board assemblies?

     D.   Because it avoids having to dimension individual
          locations.

Resource:  IPC-D-275 para 5.1.2 and 6.1.2         

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Williams at [log in to unmask]

Dieter Bergman