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
3... show full transcript
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 lead to inconsistent fuel delivery, resulting in low pressure.
A clogged fuel filter can restrict the flow of fuel, causing a decrease in fuel 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 depth micrometer is used to accurately measure the depth of a blind hole.
Step 3
3.2.2 The pitch diameter of a V-screw thread
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Answer
The screw-thread micrometer is used to accurately measure the pitch diameter of a V-screw thread.
Step 4
Give the complete reading with the unit.
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Answer
The depth micrometer reading from FIGURE 3.1 is calculated as:
Reading = 50 + 1.5 + 0.49 = 51.99 mm.
Step 5
Name TWO measurements that can be taken with a multimeter.
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Answer
DC voltage measurement, which allows for assessing the voltage in a DC circuit.
Resistance measurement, which helps in determining the resistance of a component.
Step 6
Explain TWO ways in which you will detect cylinder leakages from an internal combustion engine.
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Answer
Listen at the carburetor for a hissing noise, which may indicate air leakage.
Check for hissing noise in the dipstick hole, as this may suggest pressure escaping from the cylinder.
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.
