Discussion
‘Go’ side of the plug gauge will have the diameter equal to which of the following dimension of job?
Answer: C
The Go side of a plug gauge equals the minimum size of the job, the smallest acceptable hole.
The Go member must enter every acceptable hole, including the smallest one, so it is made to the lower limit of the hole. The No Go member is made to the upper limit, so it enters only an oversize hole. A hole is good if Go enters and No Go does not.
A Go plug at the maximum size would reject every hole but the very largest. The actual size of a particular job is what the gauge tests, not a size the gauge is made to, so 'actual size' and 'all of the above' are wrong.
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