8.1 State THREE gas analyser readings that are caused by a faulty catalytic converter - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1
Question 8
8.1 State THREE gas analyser readings that are caused by a faulty catalytic converter.
8.2 State THREE methods to determine the causes of leakages on an internal co... show full transcript
Worked Solution & Example Answer:8.1 State THREE gas analyser readings that are caused by a faulty catalytic converter - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1
Step 1
State THREE gas analyser readings that are caused by a faulty catalytic converter.
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Answer
High carbon monoxide (CO).
High nitrogen oxides (NOx).
High hydrocarbons (HC).
Step 2
State THREE methods to determine the causes of leakages on an internal combustion engine when performing a cylinder leakage test.
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Answer
Listen for hissing sounds at the air intake.
Listen for hissing sounds at the exhaust pipe.
Look for bubbles in the radiator water.
Step 3
What is the allowable variation, in percentage (%), between the compression readings?
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Answer
The allowable variation is calculated as: ext{Variation} = rac{11 - 8.2}{11} imes 100 = 25.5 ext{%}
Step 4
Calculate the maximum variation between the given readings.
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Answer
The maximum variation is found by taking the highest reading and subtracting the lowest reading: extVariation=11−8.2=2.8extbar
Step 5
State TWO possible causes of the low reading in cylinder 3.
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Answer
Worn compression rings.
Leaking valves.
Step 6
Explain TWO corrective measures after a wet test is done and the reading in cylinder 3 remains the same.
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Answer
Repair or replace the cracked cylinder head.
Replace the piston rings.
Step 7
State TWO possible causes of a low oil pressure reading on an internal combustion engine.
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Answer
Worn oil pump.
Dirty or contaminated oil.
Step 8
State TWO corrective measures.
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Answer
Use the correct oil grade.
Change the oil with clean oil.
Step 9
Name THREE checks that must be done on a fuel pressure tester before connecting it to a vehicle's fuel system.
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Answer
Ensure the tester can read the pressure of the engine.
Use the right adaptor for the engine.
Ensure that the pressure relieve valve is working properly.
Step 10
Name THREE corrective measures to the cooling system.
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