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
Lengths of metals are often marked or colour-coded to identify the type of metal, ensuring proper usage and preventing mixing different metals during fabrication.
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 based on the sound produced when they are struck.
Step 3
State ONE property of metals that can be determined by the Bending test.
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Answer
The bending test can determine the ductility of a metal, indicating how much it can be deformed before breaking.
Step 4
State ONE property of metals that can be determined by the Machining test.
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Answer
The machining test can determine the hardness of the metal by observing the ease or difficulty with which it can be cut or shaped.
Step 5
Why is metal soaked in heat when performing heat-treatment processes?
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Answer
Metal is soaked in heat during heat-treatment to ensure uniform heat distribution throughout the metal, which aids in achieving a consistent grain structure as it cools.
Step 6
State TWO methods of conducting case hardening.
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Answer
Two methods of conducting case hardening include:
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 and holding it at that temperature for a specified period. This is followed by slow cooling, which helps to relieve internal stresses and improve ductility.
Step 8
Name TWO quenching mediums that rapidly cool metal after heat-treatment processes.
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Answer
Two quenching mediums that can rapidly cool metal include:
Brine or salt water
Oil
Step 9
Which heat-treatment process follows the hardening process of a metal?
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Answer
The heat-treatment process that typically follows the hardening process of a metal is tempering.
