10.1 Name TWO types of impulse turbines - NSC Mechanical Technology Automotive - Question 10 - 2017 - Paper 1
Question 10
10.1 Name TWO types of impulse turbines.
10.2 FIGURE 10.1 shows a water turbine driving a generator. Answer the questions that follow.
10.2.1 Identify the type of t... show full transcript
Worked Solution & Example Answer:10.1 Name TWO types of impulse turbines - NSC Mechanical Technology Automotive - Question 10 - 2017 - Paper 1
Step 1
10.1 Name TWO types of impulse turbines.
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Answer
Two types of impulse turbines are Waterwheel and Pelton.
Step 2
10.2.1 Identify the type of turbine shown in FIGURE 10.1 above.
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Answer
The type of turbine shown in FIGURE 10.1 is a water turbine.
Step 3
10.2.2 Label A–F.
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A – Wicked gate
B – Rotor
C – Stator
D – Shaft
E – Water-flow
F – Blades
Step 4
10.2.3 State TWO advantages of the turbine shown in FIGURE 10.1 above.
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Low maintenance - Water turbines typically require less maintenance compared to other types due to fewer moving parts.
Cost effective - They are often more economical to operate and maintain.
Step 5
10.3.1 Supercharger.
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Increases the output power of the engine - A supercharger allows a smaller engine to deliver the same power output as a larger one.
Increases the volumetric efficiency of the engine - This helps improve overall performance and efficiency.
Step 6
10.3.2 Steam turbine.
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It is compact - Steam turbines take up less space compared to other turbine types.
No lubrication is required - This reduces the operational complexity and maintenance needs.
Step 7
10.3.3 Gas turbine.
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Very high power to weight ratio - This makes gas turbines highly efficient for their size.
Lower operating speeds - Gas turbines can operate effectively at lower speeds, providing flexibility in various applications.
Step 8
10.4 Explain the term turbo lag in terms of a turbocharger.
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Turbo lag refers to the delay experienced between pressing the accelerator and the point at which boost pressure from the turbocharger begins to increase. This delay occurs because it takes time for the exhaust gases to spin the turbine sufficiently to generate the necessary boost.
