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8.1 Explain the term pour point with regard to oils - English General - 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 - English General - NSC Mechanical Technology: Automotive - Question 8 - 2017 - Paper 1
Step 1
Explain the term pour point with regard to oils.
Answer
The pour point of an oil is defined as the lowest temperature at which the oil will flow. It indicates the fluid's ability to remain in a usable state under cold conditions, determining the temperature at which oil can still function effectively without solidifying.
Step 2
State THREE advantages of the use of cutting fluid on a centre lathe.
Answer
- Cooling of Workpiece: Cutting fluids keep the workpiece and cutting tool cool, reducing overheating and prolonging tool life.
- Improved Finish: They wash away cuttings and swarf, allowing for a better surface finish on the machined component.
- Rust Prevention: Cutting fluids help prevent rust formation on both the workpiece and machine components by providing a protective film.
Step 3
Step 4
Name the THREE main parts of a clutch assembly.
Answer
- Pressure Plate: This component exerts pressure against the clutch disc to engage and disengage the clutch.
- Clutch Plate: Also known as the clutch disc, it is the part that transmits power between the engine and transmission.
- Release Bearing (Thrust Bearing): This bearing allows for the disengagement of the clutch when the pedal is pressed, enabling smooth gear changes.
Step 5
State THREE results of a stretched chain on a chain drive system.
Answer
- Chain Weakness: The chain may weaken over time, affecting its ability to transmit power efficiently.
- Increased Friction: Stretched chains can lead to higher friction between moving parts, causing wear and tear.
- Vibration and Noise: Stretched chains may cause increased vibration and noise during operation, indicating potential failure.
Step 6
State TWO causes of belt slip on a belt drive system.
Answer
- Incorrect Tension: If the belt is not properly tensioned, it can slip off the drive pulley, leading to loss of power transmission.
- Wrong Size: Using belts that are not the correct size can lead to improper fitment, causing slippage during operation.