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 test requires the engine to be stationary to accurately measure the air pressure loss in the cylinders.
Step 2
Which wheel alignment angles are measured using the bubble gauge?
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Answer
The angles measured using a bubble gauge are known as swiped volume. This measurement indicates the correct alignment of the wheels.
Step 3
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 is equivalent to 1.6 liters.
Step 4
Which ONE of the following determines brake power using a clamping device with the brake arm?
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Answer
The Prony brake determines brake power using a clamping device with the brake arm, providing accurate measurements of the power output.
Step 5
Which ONE of the following is a cause of high carbon dioxide readings in the exhaust gas?
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Answer
High carbon dioxide readings in the exhaust gas can be caused by engine overheating. This can indicate an inefficient combustion process.
Step 6
The coolant of an engine cooling system is a mixture of ...
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Answer
The coolant of an engine cooling system is a mixture of antifreeze and water, which helps in maintaining optimal engine temperature.
Step 7
Which ONE of the following components is part of an automatic gearbox?
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Answer
The component part of an automatic gearbox is the oil pump, which circulates oil to lubricate various components.
Step 8
The hydraulic pistons in an automatic gearbox control the ...
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Answer
The hydraulic pistons in an automatic gearbox control the valve body, which directs fluid flow and engages the appropriate gears.
Step 9
Feathered tyre wear is caused by ...
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Answer
Feathered tyre wear is caused by incorrect toe setting, which leads to uneven wear patterns on the tyres.
Step 10
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, ensuring the battery receives the correct voltage.
Step 11
The amount of fuel injected decreases when the ...
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Answer
The amount of fuel injected decreases when the engine speed increases, due to changes in the fuel delivery requirements.
