3.1 Name TWO devices that are used to test the hardness of a metal - NSC Mechanical Technology Automotive - Question 3 - 2017 - Paper 1
Question 3
3.1 Name TWO devices that are used to test the hardness of a metal.
3.2 Give THREE reasons for using a compression tester on an engine.
3.3 State the function of a... show full transcript
Worked Solution & Example Answer:3.1 Name TWO devices that are used to test the hardness of a metal - NSC Mechanical Technology Automotive - Question 3 - 2017 - Paper 1
Step 1
Name TWO devices that are used to test the hardness of a metal.
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Answer
Brinell hardness tester
Rockwell hardness tester
Step 2
Give THREE reasons for using a compression tester on an engine.
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Answer
To check for worn cylinders, which can affect engine performance.
To assess the condition of piston rings; worn rings can lead to reduced compression and efficiency.
To diagnose issues with valve leakage, which can indicate a need for repairs.
Step 3
State the function of a tensile tester.
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Answer
A tensile tester measures the resistance of a material to a static or slowly applied tensile axial force. It evaluates the material's strength and ductility.
Step 4
Give TWO reasons for a high CO reading.
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Answer
A rich mixture setting can lead to incomplete combustion, resulting in higher carbon monoxide emissions.
An incorrect idle speed can also affect the combustion process, potentially increasing CO output.
Step 5
List THREE operating rules when using a multi meter.
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Answer
Ensure the measuring leads are inserted in the correct sockets for the measurement being taken.
Set the meter to the correct function before taking a reading to avoid damage.
If unsure of the expected reading, start with the highest range to prevent meter overload.
