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6.1 Name FOUR components of a motor vehicle that are driven by the crankshaft - NSC Mechanical Technology Automotive - Question 6 - 2022 - Paper 1
Question 6
6.1 Name FOUR components of a motor vehicle that are driven by the crankshaft. 6.2 Explain the following terms with regard to an internal combustion engine: 6.2.1 ... show full transcript
Worked Solution & Example Answer:6.1 Name FOUR components of a motor vehicle that are driven by the crankshaft - NSC Mechanical Technology Automotive - Question 6 - 2022 - Paper 1
Step 1
Step 2
Explain the following terms with regard to an internal combustion engine: 6.2.1 Rotating mass
Answer
Rotating mass refers to the components that rotate within the engine and require energy to keep spinning. This includes parts such as the crankshaft, flywheel, and connecting rods. The design and weight of these components significantly impact the engine's performance and stability.
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State TWO advantages of a six-cylinder V-engine over a six-cylinder straight engine.
Answer
- The V-engine configuration allows for a more compact design, making it suitable for smaller engine compartments.
- A V-engine often has a better power-to-weight ratio, resulting in improved performance.
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6.4.2 Explain how the vanes in a variable geometry turbocharger help to speed up the rotation of the turbocharger at low speed.
Answer
At low speeds, the variable nozzle vanes are almost closed, creating a narrow path for exhaust gases to exit. This design increases the velocity of the exhaust gases directed at the turbine blades, causing the turbocharger to spin faster and improve power delivery at low RPM.
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State THREE disadvantages of superchargers compared to turbochargers.
Answer
- Superchargers are generally less effective at increasing engine power at higher RPMs compared to turbochargers.
- They consume engine power directly (parasitic loss), which can affect overall efficiency.
- Superchargers typically require more space in the engine bay, while turbochargers can be placed more flexibly relative to the engine.
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What is the difference between twin-turbocharging and twin-charging?
Answer
Twin-turbocharging uses two turbochargers to enhance engine performance by providing boost at different RPM ranges. In contrast, twin-charging combines both a supercharger and a turbocharger, allowing for immediate power delivery at low RPMs while maintaining high power efficiency at higher RPMs.