10.1 Name TWO types of blowers that are used as superchargers in the engine of a motor vehicle - NSC Mechanical Technology Automotive - Question 10 - 2016 - Paper 1
Question 10
10.1 Name TWO types of blowers that are used as superchargers in the engine of a motor vehicle.
10.2 State the main function of superchargers.
10.3 State TWO advan... show full transcript
Worked Solution & Example Answer:10.1 Name TWO types of blowers that are used as superchargers in the engine of a motor vehicle - NSC Mechanical Technology Automotive - Question 10 - 2016 - Paper 1
Step 1
Name TWO types of blowers that are used as superchargers in the engine of a motor vehicle.
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Answer
Two types of blowers used as superchargers are:
Roots supercharger
Twin screw supercharger
Step 2
State the main function of superchargers.
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Answer
The main function of superchargers is to improve the volumetric efficiency of an engine, allowing it to take in more air and produce more power.
Step 3
State TWO advantages of a supercharger when compared to a turbocharger.
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Answer
Two advantages of a supercharger compared to a turbocharger are:
A supercharger has no turbo lag, providing immediate power delivery.
A supercharger is generally less expensive and less complicated to install.
Step 4
How is a turbocharger driven?
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Answer
A turbocharger is driven by the exhaust gases from the engine, which spin the turbine to compress the intake air.
Step 5
Define the run-away speed of a water turbine.
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Answer
The runaway speed of a water turbine is defined as the maximum speed the turbine can reach when it is operating at full flow with no shaft load acting on it.
Step 6
State the operational principles of EACH of the three water turbines shown in FIGURES 10.1, 10.2 and 10.3.
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Answer
For each turbine:
10.6.1 The reaction turbine operates by changing pressure as water flows through it, converting the hydraulic energy into mechanical energy.
10.6.2 The impulse turbine changes the velocity of a water jet which hits the blades, creating a change in momentum that generates rotational force.
10.6.3 The reaction turbine operates on similar principles to the first, also relying on the pressure change as water moves through it, requiring full submersion in water for optimal performance.
Step 7
Label phases A to D and part E.
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