Which of the following procedures forms part of the cylinder leakage test?
A) Connecting a compression tester to a spark plug hole
B) Cranking the engine
C) Connecting compressed air to a cylinder leakage tester
D) Cleaning around the cylinder leakage tester
A compression test is performed when the engine is .. - NSC Mechanical Technology Automotive - Question 4 - 2021 - Paper 1
Question 4
Which of the following procedures forms part of the cylinder leakage test?
A) Connecting a compression tester to a spark plug hole
B) Cranking the engine
C) Connecti... show full transcript
Worked Solution & Example Answer:Which of the following procedures forms part of the cylinder leakage test?
A) Connecting a compression tester to a spark plug hole
B) Cranking the engine
C) Connecting compressed air to a cylinder leakage tester
D) Cleaning around the cylinder leakage tester
A compression test is performed when the engine is .. - NSC Mechanical Technology Automotive - Question 4 - 2021 - Paper 1
Step 1
Which of the following procedures forms part of the cylinder leakage test?
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Answer
The correct answer is D) Cleaning around the cylinder leakage tester. This procedure is essential to ensure a proper seal and accuracy during the cylinder leakage test.
Step 2
A compression test is performed when the engine is ...
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Answer
The correct answer is B) at TDC. Performing a compression test at top dead center allows for the most accurate measurement of cylinder pressure.
Step 3
What is the function of a supercharger? To effectively ...
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Answer
The correct answer is C) drive the blower. A supercharger is designed to force more air into the engine, improving performance.
Step 4
Which ONE of the following can determine wear on a crankshaft journal?
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Answer
The correct answer is B) Measure the crankshaft journal for ovality. This measurement helps to assess wear patterns and overall condition.
Step 5
Which ONE of the following will raise the compression ratio of an engine?
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Answer
The correct answer is C) Increase the bore size of the cylinders. This modification will effectively raise the overall compression ratio.
Step 6
The total volume displaced by the piston when it moves from bottom dead center to top dead center is called the ...
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Answer
The correct answer is D) piston volume. This volume is crucial for understanding engine displacement.
Step 7
Brake power is defined as the ...
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Answer
The correct answer is B) usable power measured at the flywheel. This metric effectively represents the engine's performance output.
Step 8
What is the cause of excessive oil pressure in the engine lubricating system?
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Answer
The correct answer is A) Viscosity of the oil is too high. High viscosity can lead to increased pressure throughout the lubricating system.
Step 9
Which ONE of the following is an advantage of fitting an electric submerged fuel pump to a fuel system?
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Answer
The correct answer is D) Pump does not have to turn at high revolutions. This feature provides more flexibility in engine design.
Step 10
Reverse reduction is obtained with a single epicyclic gear system by using the following combination:
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Answer
The correct answer is D) The annulus is locked and the sun gear is the driven component. This setup allows for effective gear reduction.
Step 11
The stator in the torque converter is responsible for the ...
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Answer
The correct answer is A) increase in torque. It plays a key role in enhancing the torque transfer in the system.
Step 12
Which of the following statements best define king pin inclination?
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Answer
The correct answer is B) The angle formed between the perpendicular line and the centre line of the king pin as seen from the side. This definition accurately describes the concept.
Step 13
Which component manages the operation of the injectors in electronic fuel injection systems?
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Answer
The correct answer is D) All of the following. Each component plays a crucial role in managing injector operation.
Step 14
Which of the following methods can be used to increase the output of the engine?
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Answer
Approaches to increase engine output may include improvements in airflow, fuel quality, and tuning adjustments.
