7.1 Distinguish between the Brinell and Rockwell hardness testers that are used to determine the hardness of a metal. Use neat, labelled drawings to indicate the differences. 7.2 Describe the function of a tensile tester. 7.3 A vernier calliper is used to do precision measuring of an outside diameter, an inside diameter and the depth of a hole. Name THREE other precision measuring instruments that can be used for precision measuring these dimensions. 7.4 State THREE properties of a metal which can be determined by using a tensile tester to conduct a tensile test on a metal. 7.5 Which measuring instrument is used to measure the root diameter of a screw thread?

NSC Mechanical Technology Fitting and Machining Measuring tools: 7.1 Distinguish between the Brin

7.1 Distinguish between the Brinell and Rockwell hardness testers that are used to determine the hardness of a metal - NSC Mechanical Technology Fitting and Machining - Question 7 - 2020 - Paper 1

Question 7

7.1-Distinguish-between-the-Brinell-and-Rockwell-hardness-testers-that-are-used-to-determine-the-hardness-of-a-metal-NSC Mechanical Technology Fitting and Machining-Question 7-2020-Paper 1.png

7.1 Distinguish between the Brinell and Rockwell hardness testers that are used to determine the hardness of a metal. Use neat, labelled drawings to indicate the dif... show full transcript

Worked Solution & Example Answer:7.1 Distinguish between the Brinell and Rockwell hardness testers that are used to determine the hardness of a metal - NSC Mechanical Technology Fitting and Machining - Question 7 - 2020 - Paper 1

Step 1

Distinguish between the Brinell and Rockwell hardness testers

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Answer

The Brinell hardness tester uses a hardened steel ball as an indenter, applying a specified load to create an indentation on the metal surface. The diameter of this indentation is measured to determine hardness. In contrast, the Rockwell hardness tester employs a diamond cone or steel ball to apply a load, and it measures the depth of the indentation directly. The Rockwell method is generally faster while the Brinell method is useful for softer metals. Diagrams should illustrate both testers showing the indentation and components clearly.

Step 2

Describe the function of a tensile tester

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Answer

The tensile tester is designed to evaluate the tensile properties of materials by applying a uniaxial load until failure. It measures stress and strain, providing critical data on how materials behave under tension, which helps in determining their strength, ductility, and other mechanical properties.

Step 3

Name THREE other precision measuring instruments

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Answer

Outside micrometer
Inside micrometer
Depth micrometer

Step 4

State THREE properties of a metal which can be determined by using a tensile tester

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Answer

Tensile strength
Elasticity
Ductility

Step 5

Which measuring instrument is used to measure the root diameter of a screw thread?

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Answer

The screw thread micrometer is used to measure the root diameter of a screw thread.

7.1 Distinguish between the Brinell and Rockwell hardness testers that are used to determine the hardness of a metal - NSC Mechanical Technology Fitting and Machining - Question 7 - 2020 - Paper 1

Worked Solution & Example Answer:7.1 Distinguish between the Brinell and Rockwell hardness testers that are used to determine the hardness of a metal - NSC Mechanical Technology Fitting and Machining - Question 7 - 2020 - Paper 1

Distinguish between the Brinell and Rockwell hardness testers

Describe the function of a tensile tester

Name THREE other precision measuring instruments

State THREE properties of a metal which can be determined by using a tensile tester

Which measuring instrument is used to measure the root diameter of a screw thread?

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