QUESTION 4: MULTIPLE-CHOICE QUESTIONS (SPECIFIC)
Various options are provided as possible answers to the following questions - NSC Mechanical Technology Automotive - Question 4 - 2023 - Paper 1
Question 4
QUESTION 4: MULTIPLE-CHOICE QUESTIONS (SPECIFIC)
Various options are provided as possible answers to the following questions. Choose the answer and write only the l... show full transcript
Worked Solution & Example Answer:QUESTION 4: MULTIPLE-CHOICE QUESTIONS (SPECIFIC)
Various options are provided as possible answers to the following questions - NSC Mechanical Technology Automotive - Question 4 - 2023 - Paper 1
Step 1
4.1 Identify the equipment shown in FIGURE 4.1 below.
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Answer
The equipment shown in Figure 4.1 is a Cylinder leakage tester. This device is utilized to check for air leaks in the engine's combustion chamber.
Step 2
4.2 When checking the cylinder leakage test, the piston should be at the top.
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Answer
For an accurate cylinder leakage test, the piston should be positioned at Top Dead Center (TDC) of the compression stroke to prevent any escape of the compressed air.
Step 3
4.4 When balancing the reciprocating mass of an engine, …
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Answer
The correct answer is A: the mass of both the crank pin and the big end of the connecting rod are taken into consideration. This ensures proper balance and reduces vibrations in the engine.
Step 4
4.5 Engine capacity is the measurement of an engine's …
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Answer
The answer is C: volume. Engine capacity is typically measured in liters or cubic centimeters and reflects the total volume of all the cylinders in the engine.
Step 5
4.6 Work is defined as …
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Answer
The answer is C: the rate at which power is generated. Work can be expressed as the product of force and distance, and power is the rate of doing work.
Step 6
4.7 What is measured by the dynamometer on an engine?
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Answer
The correct answer is B: Brake power. A dynamometer measures the engine's output power, specifically the power available at the engine's output shaft.
Step 7
4.8 What will the cause be of a worn oil pump?
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Answer
The answer is A: The pump will work slower. A worn oil pump may not maintain adequate pressure, leading to lower oil flow and performance.
Step 8
4.9 Why should you be careful when removing a radiator cap when the engine is hot?
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Answer
The correct answer is C: You may burn yourself. Hot coolant can spray out if the cap is removed suddenly, causing burns.
Step 9
4.10 Stall speed in a torque converter occurs …
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Answer
The answer is B: when a vehicle drives at the lowest speed before stalling. This is the minimum speed at which the torque converter can function.
Step 10
4.11 The device that controls the functioning of the electronic automatic transmission is the …
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Answer
The correct answer is A: power management system. This system manages the operation of the transmission based on various inputs.
Step 11
4.12 What is the cause of the tyre wear pattern shown in FIGURE 4.12 below?
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Answer
The answer is D: Over-inflated wheel. Over inflation causes uneven wear on the center of the tire, affecting traction.
Step 12
4.13 Which CORRECT combination of components form part of the distributorsless ignition system (DIS)?
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Answer
The correct answer is A: Electronic control unit, crankshaft position sensor and ignition coil. These components work together for effective ignition control.
Step 13
4.14 Why are the calibration values of the diesel injector loaded into the ECM?
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Answer
The answer is D: To increase the injection duration. Calibration ensures optimal performance of the diesel engine by adjusting fuel delivery.
