8.1 State THREE exhaust gas analyser readings that indicate a lean fuel mixture - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1
Question 8
8.1 State THREE exhaust gas analyser readings that indicate a lean fuel mixture.
8.2 State THREE possible causes of high levels of hydrocarbon (HC) readings in the ... show full transcript
Worked Solution & Example Answer:8.1 State THREE exhaust gas analyser readings that indicate a lean fuel mixture - NSC Mechanical Technology Automotive - Question 8 - 2022 - Paper 1
Step 1
State THREE exhaust gas analyser readings that indicate a lean fuel mixture.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
High Oxygen (O2) levels.
Low Carbon Dioxide (CO2) levels.
High Nitrogen Oxide (NOx) levels.
Step 2
State THREE possible causes of high levels of hydrocarbon (HC) readings in the exhaust gas of an internal combustion engine.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Incomplete combustion.
Improper valve timing.
Faulty air management system.
Step 3
Tabulate TWO possible causes and their corrective measures when two adjacent cylinders have very low but similar readings when doing a compression test on a four-stroke internal combustion engine.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Causes
Corrective Measures
Blown cylinder head gasket
Replace with new gasket
Cracked cylinder head
Replace/repair cylinder head
Step 4
State TWO causes of bubbles in the radiator water when a cylinder leakage test is conducted on an internal combustion engine.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Oil pressure at idling speed.
Oil pressure at high revolutions.
Step 5
Name THREE manufacturer's specifications that must be obtained before conducting an oil pressure test.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Oil pressure when engine is cold.
Oil pressure when engine is hot.
Oil pressure when engine is not running.
Step 6
State FOUR precautions that must be adhered to while setting up the fuel pressure tester.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Ensure correct PPE is worn.
Clean the area around the sender unit before removal.
Ensure the tester is in good working condition.
Position the tester at a safe distance from the running engine.
Step 7
The pressure dropped during a radiator pressure test. State FOUR measures to correct the pressure drop.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
