3.1 Explain how a voltmeter and an ammeter are connected to a circuit - NSC Mechanical Technology Automotive - Question 3 - 2017 - Paper 1
Question 3
3.1 Explain how a voltmeter and an ammeter are connected to a circuit.
3.2 State FOUR uses of a multimeter.
3.3 A dry compression test on an internal combustion en... show full transcript
Worked Solution & Example Answer:3.1 Explain how a voltmeter and an ammeter are connected to a circuit - NSC Mechanical Technology Automotive - Question 3 - 2017 - Paper 1
Step 1
Explain how a voltmeter and an ammeter are connected to a circuit.
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Answer
A voltmeter is connected in parallel to the component whose voltage is to be measured, allowing it to measure the potential difference without disrupting the circuit flow. Conversely, an ammeter is connected in series with the circuit to measure the current flowing through it, ensuring that all current in the circuit flows through the ammeter.
Step 2
State FOUR uses of a multimeter.
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Direct current measurement (DC) - Measures DC electrical current.
Voltage measurement - Measures voltage levels in a circuit.
Resistance measurement - Tests the resistance of electrical components.
Diode test - Checks the functionality of diodes.
Step 3
What conclusion can be made regarding these readings?
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The very low reading from the dry compression test suggests that the piston rings may be worn out or that there are worn cylinders. The higher reading from the wet compression test indicates that the increased pressure is likely due to the oil sealing the gaps, confirming wear in the piston assembly or cylinder walls.
Step 4
Describe the purpose of the following tests:
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Step 5
Beam-bending test
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A beam-bending test is conducted to investigate the deflection or bend of beams under load, which helps assess the beam's strength and structural integrity.
Step 6
Cylinder leakage test
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A cylinder leakage test is performed to check whether gases or air leaks from the cylinders through valves or piston rings, which can indicate wear or failure in essential engine components.
