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 combustion engine when performing a cylinder leakage test. 8.3 The following readings were taken during a compression test: Cylinder 1: 11 bar Cylinder 2: 9 bar Cylinder 3: 8.2 bar Cylinder 4: 9.8 bar 8.3.1 What is the allowable variation, in percentage (%), between the compression readings? 8.3.2 Calculate the maximum variation between the given readings. 8.3.3 State TWO possible causes of the low reading in cylinder 3. 8.3.4 Explain TWO corrective measures after a wet test is done and the reading in cylinder 3 remains the same. 8.4 State TWO possible causes of a low oil pressure reading on an internal combustion engine. 8.5 The condition of the oil caused high oil pressure in an internal combustion engine. State TWO corrective measures. 8.6 Name THREE checks that must be done on a fuel pressure tester before connecting it to a vehicle's fuel system. 8.7 During a cooling system pressure test on an internal combustion engine, the pressure dropped. Name THREE corrective measures to the cooling system.

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8.1 State THREE gas analyser readings that are caused by a faulty catalytic converter - English General - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1

Question 8

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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 - English General - 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:
$ext{Variation} = 11 - 8.2 = 2.8 ext{ bar}$

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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Answer

Renew the faulty water hose.
Renew the radiator.
Replace the heater tap.

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8.1 State THREE gas analyser readings that are caused by a faulty catalytic converter - English General - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1

Worked Solution & Example Answer:8.1 State THREE gas analyser readings that are caused by a faulty catalytic converter - English General - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1

State THREE gas analyser readings that are caused by a faulty catalytic converter.

State THREE methods to determine the causes of leakages on an internal combustion engine when performing a cylinder leakage test.

What is the allowable variation, in percentage (%), between the compression readings?

Calculate the maximum variation between the given readings.

State TWO possible causes of the low reading in cylinder 3.

Explain TWO corrective measures after a wet test is done and the reading in cylinder 3 remains the same.

State TWO possible causes of a low oil pressure reading on an internal combustion engine.

State TWO corrective measures.

Name THREE checks that must be done on a fuel pressure tester before connecting it to a vehicle's fuel system.

Name THREE corrective measures to the cooling system.

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