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
A faulty diaphragm in the fuel pump may prevent it from generating adequate pressure.
A clogged fuel filter can restrict the flow of fuel, leading to low 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 measure the depth of a blind hole accurately.
Step 3
Which precision measuring instrument is used to measure the following accurately:
3.2.2 The pitch diameter of a V-screw thread
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Answer
The screw-thread micrometer is the appropriate instrument for accurately measuring 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 is 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.
Resistance measurement.
Step 6
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 or exhaust pipe, which could indicate air or exhaust leaks.
Check the dipstick hole for hissing sounds, which can imply leakage 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.
