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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The two devices that can be used to test the hardness of a metal are the Brinell hardness tester and the Rockwell hardness tester.
Step 2
Give THREE reasons for using a compression tester on an engine.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To check for worn cylinders, which may indicate engine wear over time.
To evaluate the sealing condition of the piston rings, ensuring efficient operation.
To diagnose potential issues with worn valve seats or guides, affecting performance and emissions.
Step 3
State the function of a tensile tester.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A tensile tester measures the resistance of a material to a static or slowly applied tensile axial force, helping to determine the material's tensile strength, elasticity, and ductility.
Step 4
Give TWO reasons for a high CO reading.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A rich mixture setting in the fuel system, leading to incomplete combustion.
An incorrect idle speed, which can cause suboptimal fuel-air ratios, resulting in increased CO emissions.
Step 5
List THREE operating rules when using a multi meter.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Always ensure the measuring leads are inserted into the correct sockets for the measurement being taken.
Set the multi-meter to the desired function before taking any readings.
Start with the highest range if the measurement size is unknown to prevent damage to the meter.
