3.1 Give TWO reasons for low fuel pressure - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2017 - Paper 1
Question 3
3.1 Give TWO reasons for low fuel pressure.
3.2 Which precision measuring instrument is used to measure the following accurately:
3.2.1 The depth of a blind hole.
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Worked Solution & Example Answer:3.1 Give TWO reasons for low fuel pressure - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2017 - Paper 1
Step 1
3.1 Give TWO reasons for low fuel pressure.
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Answer
Faulty diaphragm in the fuel pump can cause a drop in fuel pressure as it may not effectively maintain the required seal.
Clogged fuel filter can restrict fuel flow, resulting in insufficient pressure reaching the engine.
Step 2
3.2.1 The depth of a blind hole.
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Answer
The suitable precision measuring instrument for this task is a depth micrometer.
Step 3
3.2.2 The pitch diameter of a V-screw thread.
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Answer
The appropriate instrument to measure this is a screw-thread micrometer.
Step 4
3.3 A depth micrometer reading is shown in FIGURE 3.1.
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The reading of the micrometer is 50+1.5+0.49=51.99 mm.
Step 5
3.4 Name TWO measurements that can be taken with a multimeter.
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DC voltage measurement to assess voltage in direct current circuits.
Resistance measurement to check the resistance across components.
Step 6
3.5 Explain TWO ways in which you will detect cylinder leakages from an internal combustion engine.
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Answer
Listen to the carburetor for a hissing noise which may indicate a vacuum leak.
Listen at the exhaust pipe for hissing noises, suggesting possible leaks in the exhaust system.
Step 7
3.6 State TWO uses of the cooling system pressure tester.
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To test if the pressure cap on the cooling system operates according to the prescribed pressure of the system.
To pump compressed air into the cooling system to determine whether there are any water leakage in the system.
