During which test should the crankshaft be locked to prevent the engine from turning?
A - NSC Mechanical Technology Automotive - Question 4 - 2023 - Paper 1
Question 4
During which test should the crankshaft be locked to prevent the engine from turning?
A. Compression test
B. Exhaust gas analysis
C. Cylinder leakage test
D. Comput... show full transcript
Worked Solution & Example Answer:During which test should the crankshaft be locked to prevent the engine from turning?
A - NSC Mechanical Technology Automotive - Question 4 - 2023 - Paper 1
Step 1
During which test should the crankshaft be locked to prevent the engine from turning?
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Answer
The crankshaft should be locked during the Cylinder leakage test. This is important to prevent the engine from turning over, which could lead to inaccurate tests.
Step 2
Which wheel alignment angles are measured using the bubble gauge?
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Answer
The wheel alignment angle measured using the bubble gauge is Toe. This ensures that the vehicle maintains stability and handling.
Step 3
The combustion chamber volume is also known as the …
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Answer
The combustion chamber volume is also known as the clearance volume. This refers to the space in the combustion chamber, especially when the piston is at the top dead center.
Step 4
The engine capacity of a four-cylinder 1 600 cm³ engine is …
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Answer
The engine capacity of a four-cylinder 1 600 cm³ engine is 1 600 ml. This indicates the total displacement volume of the engine.
Step 5
Which ONE of the following determines brake power using a clamping device with the brake arm?
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Answer
The device that determines brake power using a clamping mechanism is the Prony brake. This equipment measures the power output by applying load to the brake system.
Step 6
Which ONE of the following is a cause of high carbon dioxide readings in the exhaust gas?
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Answer
A cause of high carbon dioxide readings in the exhaust gas is Engine overheating. This condition may lead to incomplete combustion.
Step 7
The coolant of an engine cooling system is a mixture of …
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Answer
The coolant in an engine cooling system is a mixture of antifreeze and water. This mixture prevents freezing and overheating.
Step 8
Which ONE of the following components is part of an automatic gearbox?
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Answer
A component of an automatic gearbox is the Oil pump. It circulates the transmission fluid necessary for lubrication and operation.
Step 9
The hydraulic pistons in an automatic gearbox control the …
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Answer
The hydraulic pistons in an automatic gearbox control the gearshift lever mechanism. This allows for smooth gear transitions.
Step 10
Feathered tyre wear is caused by …
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Answer
Feathered tyre wear is caused by incorrect toe setting. This misalignment can lead to uneven wear on the tyres.
Step 11
Which component of the alternator controls the charging level of the battery?
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Answer
The component of the alternator that controls the charging level of the battery is the Regulator. It maintains the correct voltage output.
Step 12
The amount of fuel injected decreases when the …
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Answer
The amount of fuel injected decreases when the engine speed increases. Higher speeds often lead to a more efficient fuel-to-air ratio.
