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8.1 Explain the term pour point with regard to oils - NSC Mechanical Technology Automotive - Question 8 - 2017 - Paper 1
Question 8
8.1 Explain the term pour point with regard to oils. 8.2 State THREE advantages of the use of cutting fluid on a centre lathe. 8.3 What does the abbreviation ATF s... show full transcript
Worked Solution & Example Answer:8.1 Explain the term pour point with regard to oils - NSC Mechanical Technology Automotive - Question 8 - 2017 - Paper 1
Step 1
Explain the term pour point with regard to oils.
Answer
The term 'pour point' refers to the lowest temperature at which a liquid, such as an oil, will flow. This property is critical for assessing the performance of oils in cold conditions, ensuring that machinery and engines can start and operate correctly even in low temperatures.
Step 2
State THREE advantages of the use of cutting fluid on a centre lathe.
Answer
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Cooling: The cutting fluid helps keep the workpiece and cutting tool cool, preventing overheating and reducing wear on the tools.
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Improved Finish: It washes away the cuttings and swarf, leading to a better surface finish on machined parts.
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Rust Prevention: Cutting fluids can protect the machine and workpiece from rust, prolonging their life and ensuring better performance.
Step 3
Step 4
Name the THREE main parts of a clutch assembly.
Answer
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Pressure Plate: This component applies pressure to the clutch disc to engage or disengage power transmission.
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Clutch Plate: The clutch plate, or disc, is the part that interacts with the pressure plate and the flywheel to transfer power.
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Release Bearing (Thrust Bearing): This bearing helps disengage the clutch when the pedal is pressed, allowing for smooth gear shifting.
Step 5
State THREE results of a stretched chain on a chain drive system.
Answer
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Chain Weakness: A stretched chain results in reduced tension, causing it to weaken and function poorly.
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Increased Friction: This can lead to increased friction between the chain and the sprockets, leading to accelerated wear.
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Noise and Vibration: A stretched chain can generate noise and vibrations, indicating that the system may be on the verge of failure.
Step 6
State TWO causes of belt slip on a belt drive system.
Answer
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Incorrect Tension: If the belt is not tensioned correctly, it may slip, leading to inefficient operation.
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Oil on the Belt Surface: Contamination of the belt surface with oil can decrease friction, causing the belt to slip and fail to drive the system effectively.