3.1 Give TWO reasons for low fuel pressure - NSC Mechanical Technology Automotive - 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 Automotive - Question 3 - 2017 - Paper 1
Step 1
Give TWO reasons for low fuel pressure.
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Answer
Faulty diaphragm in the fuel pump can prevent adequate pressure from being generated.
Clogged fuel filter may restrict fuel flow, leading to low pressure.
Step 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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Answer
The instrument used to measure the depth of a blind hole is a Depth Micrometer.
Step 3
3.2.2 The pitch diameter of a V-screw thread.
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Answer
The precision measuring instrument for this purpose is a Screw-thread Micrometer.
Step 4
A depth micrometer reading is shown in FIGURE 3.1. Give the complete reading with the unit.
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Answer
The complete depth micrometer reading is 51.99 mm. This includes the initial reading of 50 mm, the additional 1.5 mm from the scale, and 0.49 mm from the vernier scale.
Step 5
Name TWO measurements that can be taken with a multimeter.
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Answer
DC Voltage Measurement: This is used to measure the voltage of direct current circuits.
Ohm Measurement: This is used to measure resistance in a circuit.
Step 6
Explain TWO ways in which you will detect cylinder leakages from an internal combustion engine.
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Answer
Listening at the carburetor for a hissing noise can indicate air leaks, leading to uneven engine performance.
Checking for bubbles in the radiator fluid by removing the filler cap can specify head gasket issues or cracks in the cylinder block.
Step 7
State TWO uses of the cooling system pressure tester.
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Answer
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 leakages in the system.
