Which ONE of the following safety procedures relates to the cylinder leakage tester?
A - NSC Mechanical Technology Automotive - Question 4 - 2019 - Paper 1
Question 4
Which ONE of the following safety procedures relates to the cylinder leakage tester?
A. Use water to remove dust around the spark-plug area.
B. Clean the oil-fil... show full transcript
Worked Solution & Example Answer:Which ONE of the following safety procedures relates to the cylinder leakage tester?
A - NSC Mechanical Technology Automotive - Question 4 - 2019 - Paper 1
Step 1
Which ONE of the following safety procedures relates to the cylinder leakage tester?
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Answer
The safety procedure that relates to the cylinder leakage tester is to ensure that the tester must be well tightened until no hissing sounds can be heard. Therefore, the correct option is D.
Step 2
Which ONE of the following tests indicates the condition of an engine's piston rings?
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Answer
The cylinder leakage test indicates the condition of an engine's piston rings, ensuring no leaks are present. Thus, the correct choice is A.
Step 3
The supercharger is the most efficient and common of all forced-induction systems.
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Answer
The most common and efficient supercharger among forced-induction systems is the centrifugal type, making the answer C.
Step 4
What do you understand by the term boost with regard to turbochargers?
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Answer
In the context of turbochargers, boost refers to the increase in manifold pressure that is generated in the inlet manifold. This corresponds to option C.
Step 5
What is the unit for turning moment?
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Answer
The unit for turning moment is represented as Newton-meters (N.m), hence the answer is B.
Step 6
Which ONE of the following methods is used to raise the compression ratio of an internal combustion engine?
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Answer
To raise the compression ratio of an internal combustion engine, one method is to adjust the valve timing on the belt, making A the correct choice.
Step 7
Which ONE of the following safety measures must be considered while setting up the oil pressure tester? Make sure that …
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Answer
It is crucial to ensure that the adapter fitted to the exhaust system fits well to maintain an accurate reading, thus the answer is B.
Step 8
What will be the mechanical efficiency of an engine, if the brake power of the engine is 66 kW and the indicated power is 75 kW?
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Answer
The mechanical efficiency can be calculated as: ext{Efficiency} = rac{ ext{Brake Power}}{ ext{Indicated Power}} imes 100 = rac{66 ext{ kW}}{75 ext{ kW}} imes 100 \ ext{Efficiency} hickapprox 88 ext{%}
Thus, the answer is C.
Step 9
What will be the gear ratio of a gear system, if the driver gear has 25 teeth and the driven gear 100?
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Answer
The gear ratio can be obtained by dividing the number of teeth on the driven gear by the number of teeth on the driver gear: ext{Gear Ratio} = rac{100}{25} = 4:1
Hence, the answer is B.
Step 10
What do you understand by the term torsional vibration in relation to …
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Answer
Torsional vibration refers to oscillations about an axis of a rotating system. More context would assist in a more specific explanation.
Step 11
Which ONE of the following methods is used to increase the output frequency of the alternator?
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Answer
To increase the output frequency of the alternator, the method is to increase the number of turns of the wire on the rotating coil, making B the correct answer.
Step 12
What does it mean if a fuel pump is referred to as a wet pump? It means …
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Answer
If a fuel pump is referred to as a wet pump, it signifies that the pump feeds the fuel from the fuel tank at predetermined pressure, indicating option A.
