3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends - NSC Mechanical Technology Fitting and Machining - 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 Fitting and Machining - 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
The lengths of metals are typically marked or colour-coded at the ends to identify the type of metal. This helps in quickly recognizing the metal's properties and suitable applications.
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
The sound test can determine the hardness of the metal, as different metals produce distinct sounds when struck.
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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The bending test can determine the ductility of the metal, which shows how much it can be deformed without breaking.
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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The machining test can assess the hardness of the metal, indicating its resistance to machining processes.
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, allowing for proper transformation of its microstructure for enhanced mechanical properties.
Step 6
State TWO methods of conducting case hardening.
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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 its upper critical temperature, holding it at that temperature for a specified time to allow for uniform heat distribution, and then slowly cooling it back to room temperature. This process helps relieve internal stresses and improve ductility.
Step 8
Name TWO quenching mediums that rapidly cool metal after heat-treatment processes.
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Brine/Salt water
Oil
Step 9
Which heat-treatment process follows the hardening process of a metal?
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The heat-treatment process that typically follows hardening is Tempering.
