1.1 Which ONE of the following safety measures applies to a power saw?
A - NSC Mechanical Technology Fitting and Machining - Question 1 - 2017 - Paper 1
Question 1
1.1 Which ONE of the following safety measures applies to a power saw?
A. Make sure that the cutting speed is set at the highest setting for the best performance.
B.... show full transcript
Worked Solution & Example Answer:1.1 Which ONE of the following safety measures applies to a power saw?
A - NSC Mechanical Technology Fitting and Machining - Question 1 - 2017 - Paper 1
Step 1
Which ONE of the following safety measures applies to a power saw?
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Answer
The correct choice is B. Long pieces of material must be supported at the ends. Ensuring proper support prevents the material from bending or breaking during the cutting process, promoting safety.
Step 2
Which ONE of the following safety measures applies to a tensile tester?
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Answer
The correct choice is D. Verify the load indicator. It is crucial to check the load indicator to ensure accurate readings and prevent any potential equipment failure or unsafe conditions.
Step 3
A Rockwell tester is used to test the … of a material.
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Answer
The correct answer is A. hardness. Rockwell testers measure the hardness of materials by using a specified minor load followed by a major load.
Step 4
Which ONE of the following is a reason for a high carbon-monoxide reading on an internal combustion engine?
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Answer
The correct choice is A. High compression. A higher compression can lead to complete combustion, producing more CO due to incomplete burning of fuel.
Step 5
The second arrest temperature (Ac2) for carbon steel is …
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Answer
The correct answer is D. 800 °C. The heat treatment process for carbon steel involves specific temperature thresholds, with Ac2 referring to a critical point.
Step 6
The minimum diameter of a screw thread is measured at the … of the screw thread.
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Answer
The correct answer is A. root. The root of the screw thread is the diameter measured at the bottom of the thread groove.
Step 7
What is the gear ratio of a Cincinnati dividing head used on a milling machine?
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Answer
The correct choice is A. 60 : 1. This ratio refers to the relationship between the rotations of the input and output shafts.
Step 8
Which ONE of the following is a common cause of incomplete penetration into a welded joint?
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Answer
The correct answer is B. Slag not removed from the first weld before the second weld was run. This can prevent proper fusion and integrity of the welded joint.
Step 9
What does the X-ray test on a welded joint detect?
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Answer
The correct choice is B. Internal defects. X-ray testing is a non-destructive method to identify hidden defects within the welded joints.
Step 10
One (1) Pascal can be expressed as…
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Answer
The correct answer is B. 1 N acting on 1 m². Pascal is the SI unit for pressure, defined as one newton per square meter.
Step 11
What is discussed by Young's elasticity modulus?
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Answer
The correct answer is B. The ratio between stress and strain in a material, provided that the limit of elasticity is not exceeded. This defines the material's stiffness.
Step 12
What is represented by point D on the stress-strain graph shown in FIGURE 1.1?
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Answer
The correct answer is D. The maximum stress. Point D typically indicates the ultimate tensile strength of the material.
Step 13
Where is extreme pressure (EP) oil used?
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Answer
The correct answer is B. In the power steering. EP oil is used in power steering systems to withstand high pressures.
Step 14
What will the rotation frequency of pulley B be if pulley A rotates at 2 000 r/min, as shown in FIGURE 1.3 below?
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Answer
The correct answer is D. 1 000 r/min. The frequency ratio will depend on the diameters of the pulleys, which is a common concept in mechanics.
Step 15
The function of a supercharger fitted to an internal combustion engine is to compress air by air… action.
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Answer
The correct answer is B. mechanical. Superchargers utilize mechanical means to compress the intake air.
Step 16
What do you understand by the term boost in regards to turbochargers?
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Answer
The correct answer is A. The pressure that a turbocharger creates in the inlet manifold. This boost increases the engine power output.
