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 ... 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
One reason why metals are marked or colour-coded at the ends is to identify the type of metal. This helps prevent misuse and ensures that the correct metal is used for specific applications.
Step 2
State ONE property of metals that can be determined by the Sound test.
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Answer
The sound test can determine the hardness of metals. When struck, different metals produce distinct sounds that indicate their hardness.
Step 3
State ONE property of metals that can be determined by the Bending test.
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The bending test determines the ductility of metals. It assesses how much a metal can bend before it fractures.
Step 4
State ONE property of metals that can be determined by the Machining test.
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Answer
The machining test helps determine the strength of metals. It measures how well the metal maintains its integrity during the machining process.
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 material. This helps achieve a uniform grain structure after cooling the metal.
Step 6
State TWO methods of conducting case hardening.
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Answer
Two methods of conducting case hardening are:
Carburising
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 specific period. After maintaining this temperature, the steel is then slowly cooled back to room temperature, which refines its structure and enhances its ductility.
Step 8
Name TWO quenching mediums that rapidly cool metal after heat-treatment processes.
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Answer
Two quenching mediums are:
Water
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. This process alleviates stresses and reduces brittleness in the hardened metal.
