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Abrasion Resistance

Dorry's abras...

Question

Dorry's abrasion test registered a loss in weight of 27 gm. The respective coefficient of hardness will be ______

A

11

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B

10

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C

9

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D

8

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Solution

The correct option is A 11
In dorry abrasion test,

Coefficient of hardness =
$20 - \frac{loss of weight in gm}{3}$

$= 20 - \frac{27}{3}$

Coefficient of hardness = 11

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