Brinell Hardness Test — MFDS Part 1 MCQ
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Correct answer: D — Brinell hardness test
The correct answer is D, the Brinell hardness test. A specified load is applied through a spherical tungsten carbide indenter, and the diameter of the permanent circular indentation is measured to calculate the Brinell hardness value. Rockwell testing may also use a ball on some scales, but it determines hardness from the change in indentation depth under minor and major loads, not from the residual indentation diameter. Vickers and Knoop are microindentation tests using diamond pyramidal indenters; Vickers produces an approximately square impression, whereas Knoop produces an elongated rhomboidal impression. Shore testing is principally used for polymers and elastomers and assesses durometer indentation or rebound behaviour, depending on the method.
Reference: Low S, Germak A, Knott A, Machado R, Song J. Developing definitions of conventional hardness tests for use by national metrology institutes. Measurement: Sensors. 2021;18:100096. https://pubmed.ncbi.nlm.nih.gov/38868497/