FIGURE 6.1 below shows a component of a four-cylinder in-line (straight) engine - NSC Mechanical Technology Automotive - Question 6 - 2023 - Paper 1
Question 6
FIGURE 6.1 below shows a component of a four-cylinder in-line (straight) engine. Answer the questions that follow.
6.1.1 Identify the component.
6.1.2 What is the... show full transcript
Worked Solution & Example Answer:FIGURE 6.1 below shows a component of a four-cylinder in-line (straight) engine - NSC Mechanical Technology Automotive - Question 6 - 2023 - Paper 1
Step 1
Identify the component.
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Answer
The component is the crankshaft.
Step 2
What is the main function of the component?
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Answer
The main function of the crankshaft is to convert the reciprocating motion of the pistons into rotary motion, allowing for the engine output to be utilized effectively.
Step 3
Which part of the component is drilled to balance it?
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Answer
The part of the crankshaft that is drilled to balance it is the crank web.
Step 4
Explain static balance of this component.
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Answer
Static balance in the context of the crankshaft refers to a condition where the mass is equal in all directions from the center of rotation. This is crucial because it minimizes vibrations when the engine is at rest, ensuring stability and smooth operation during rotation.
Step 5
Where on an engine is a vibration damper normally mounted?
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A vibration damper is normally mounted on the crankshaft of the engine.
Step 6
What is the function of a vibration damper?
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The function of a vibration damper is to smooth out and dampen the engine vibrations that occur during operation, which enhances the longevity of the engine components and improves comfort.
Step 7
Name THREE different types of engine cylinder configurations.
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Answer
Inline / Straight
V
Flat / Horizontal
Step 8
Give TWO reasons why the power strokes of an engine are often spaced at equal intervals.
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To reduce engine vibrations.
To ensure smooth running of the engine.
Step 9
State THREE methods to determine the firing order of an engine.
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Answer
Read from the vehicle specifications.
Check the order in which the valves rock.
Inspect the order in which the sparks are distributed from the distributor.
Step 10
Explain the term boost.
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Boost refers to the increasing of manifold pressure above the normal atmospheric pressure, allowing more air to enter the combustion chamber for more power.
Step 11
Name the TWO types of turbochargers.
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Variable Geometry Turbocharger (VGT)
Non-variable Turbocharger
Step 12
Give TWO reasons why superchargers are fitted to engines.
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To increase cylinder pressure/compression pressure.
To increase the volumetric efficiency of the engine.
Step 13
Name TWO mechanical drive systems used to turn superchargers.
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Belt
Gears
Step 14
What does a twin-charging forced induction system consist of?
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A twin-charging forced induction system consists of both a turbocharger and a supercharger working together to increase engine power and efficiency.
Step 15
State TWO advantages of using a twin-charging forced induction system on an engine.
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Outstanding fuel economy.
Reduces/eliminates lag at low revolutions by providing immediate power response.
