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Understanding Hardness Testing in Material Engineering

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Understanding Hardness Testing in Material Engineering

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Questions and Answers

What is hardness defined as?

The strength of a material

Resistance of a material to penetration, indentation, or scratches (correct)

The brittleness of a material

The ability of a material to withstand pressure

What is the typical range of diameter for the impression made on a test piece in Brinell hardness test?

6 to 10 mm

2 to 6 mm (correct)

1 to 3 mm

10 to 15 mm

What is the principle of operation of the Brinell hardness test?

Determining the brittleness of the material

Obtaining Brinell Hardness Number (BHN) by the ratio of calculated load and spherical area of the indentation (correct)

Measuring the depth of the indentation made on the specimen

Calculating the resistance of the material to scratching

What load is used for impressing a standard hardened steel ball on a flat surface of a test specimen in Brinell hardness test for iron and steel?

3000 kg (B) Signup and view all the answers

Which materials are not suitable for hardness measurement using the Brinell hardness test?

'Very hard and brittle' materials (D) Signup and view all the answers

Which branch of metallurgy is mainly concerned with the reduction and oxidation of metals?

Chemical metallurgy (D) Signup and view all the answers

What is the primary focus of physical metallurgy?

Mechanical properties of metals (C) Signup and view all the answers

What is the role of a specialist practitioner in metallurgy known as?

Metallurgist (C) Signup and view all the answers

What distinguishes metallurgy from metalworking?

Metallurgy involves the production and engineering of metal components, while metalworking does not (A) Signup and view all the answers

What are the subjects of study in chemical metallurgy?

Mineral processing, thermodynamics, electrochemistry (C) Signup and view all the answers