Metrology and Quality Control - Mechanical Engineering (MCQ) questions and answers for Q. 4808

Q.  Which among the following is a type of direct measuring instrument of roughness?
- Published on 07 Aug 15

a. Micro interferometer
b. Wallace surface dynamometer
c. Profilometer
d. None of the above

ANSWER: Profilometer

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    Discussion

  • Sravanthi   -Posted on 26 Oct 15
    - Different methods are used to measure roughness of a surface. Direct measuring instruments of roughness are profilometers, profilographs, Tomilson surface tester, Taylor-Hobson-Talysurf roughness tester,etc

    - Profilometer is used for quantitative evaluation of surface roughness. The quantity measured may be maximum or C.L.A or RMS value value of roughness is obtained.

    - C.L.A. or RMS value of roughness is directly measured by using a tracer unit on the surface. The tracer unit uses pointed diamond stylus to test the surface and has radius of 0.002 mm to 0.01 mm.

    - Profilometers are calibrated with standard electroformed surface which is called as surface profile. These instruments are suitable to measure surface finish of deep bores.

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