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A taper ring gauge is used for checking:

  • A.External taper
  • B.Internal taper
  • C.External thread
  • D.Internal thread

Answer: A

A taper ring gauge checks an external taper.

A ring gauge is a hollow gauge that fits over the work, so it is used on outside surfaces. A taper ring gauge has a tapered bore; the tapered shank is pushed in, and the fit, often checked with a light coat of Prussian blue, shows whether the angle and size of the taper are right.

An internal taper is checked with a taper plug gauge, which goes into the hole. Threads are checked with thread ring and thread plug gauges, which have threaded forms rather than a plain taper.

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