Virtual Labs

What is the diameter of the Rockwell ball indentor?

a: 1/16 inch Explanation

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b: 1/3 inch Explanation

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c: 1/7 inch Explanation

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d: 1/5 inch Explanation

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Load applied for Rockwell C test is more than Rockwell B test

a: False Explanation

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b: True Explanation

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What is the unit of Rockwell hardness number?

a: Dimensionless number Explanation

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b: Pascal Explanation

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c: Newton Explanation

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d: Kilograms Explanation

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Match the following for Rockwell hardness test

a: a-2,b-1,c-3 Explanation

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b: a-1,b-3,c-2 Explanation

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c: a-3,b-1,c-2 Explanation

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d: a-1,b-2,c-3 Explanation

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What is the value of minor load applied in the experiment?

a: 12 Kg Explanation

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b: 8 Kg Explanation

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c: 10 Kg Explanation

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d: 5 Kg Explanation

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Why minor load is initially applied in Rockwell hardness test?

a: specimen cannot bear the major load Explanation

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b: to distribute the load acting on the specimen Explanation

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c: to firmly seat the penetrator in to position for major load Explanation

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d: none of these Explanation

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Rockwell hardness number is obtained by

a: By Rockwell hardness formula Explanation

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b: Direct reading from the gauge Explanation

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c: Both a and b Explanation

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d: None of these Explanation

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Diamond indentor can be used for metals having hardness

a: Below 20HRC Explanation

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b: Above 20HRC Explanation

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c: For any values Explanation

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d: None of the above Explanation

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In C-scale of Rockwell hardness testing, the shape of indenter used is

a: Diamond cone Explanation

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b: Steel ball Explanation

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c: Steel prism Explanation

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d: Any of the above Explanation

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Rockwell Hardness Test