3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends - NSC Mechanical Technology Automotive - Question 3 - 2023 - Paper 1
Question 3
3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends.
3.2 State ONE property of metals that can be determined by EACH of th... show full transcript
Worked Solution & Example Answer:3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends - NSC Mechanical Technology Automotive - Question 3 - 2023 - Paper 1
Step 1
Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends.
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Answer
Metals are typically marked or colour-coded at the ends to identify the type of metal, which is crucial for selecting appropriate applications and ensuring compatibility with other materials.
Step 2
State ONE property of metals that can be determined by EACH of the following tests:
3.2.1 Sound test.
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Answer
One property that can be determined by the sound test is the hardness of the metal.
Step 3
State ONE property of metals that can be determined by EACH of the following tests:
3.2.2 Bending test.
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One property that can be determined by the bending test is the ductility of the metal.
Step 4
State ONE property of metals that can be determined by EACH of the following tests:
3.2.3 Machining test.
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One property that can be determined by the machining test is the strength of the metal.
Step 5
Why is metal soaked in heat when performing heat-treatment processes?
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Metal is soaked in heat during heat-treatment processes to ensure uniform heat distribution throughout the metal and to achieve a uniform grain structure after cooling.
Step 6
State TWO methods of conducting case hardening.
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Two methods of conducting case hardening are Carburising and Nitriding.
Step 7
Explain how steel is annealed during heat-treatment processes.
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Answer
Steel is annealed by heating it slightly above the upper critical temperature (Ac3) for a specified period, then allowing it to cool slowly back to room temperature. This process helps to relieve internal stresses and improves ductility.
Step 8
Name TWO quenching mediums that rapidly cool metal after heat-treatment processes.
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Two quenching mediums are brine/salt water and oil.
Step 9
Which heat-treatment process follows the hardening process of a metal?
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The heat-treatment process that follows hardening is tempering.
