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 may cause inconsistent pressure readings.
A clogged fuel filter can restrict fuel flow, leading to low pressure.
Step 2
3.2.1 The depth of a blind hole.
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Answer
The appropriate measuring instrument for this purpose is a Depth Micrometer.
Step 3
3.2.2 The pitch diameter of a V-screw thread.
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For measuring the pitch diameter of a V-screw thread, a Screw-thread Micro-meter is used.
Step 4
3.3 Give the complete reading with the unit.
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Answer
The depth micrometer reading indicated in FIGURE 3.1 is:
Reading = 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 current measurement for reading direct current.
AC voltage measurement for assessing alternating current voltage.
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 for hissing noises at the carburetor, which may indicate a leak.
Check for hissing in the dipstick hole, which suggests internal leaks.
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 is any water leakage in the system.
