NSC Mechanical Technology Fitting and Machining Safe and hazardous conditions: Various options are provided as

Question

Various options are provided as possible answers to the following questions. Write down the question number (1.1-1.20), choose the answer and make a cross (X) over the letter (A-D) of your choice in the ANSWER BOOK.

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. Long pieces of material must be supported at the ends.
C. Make sure the blade is properly oiled.
D. Tighten the blade while the machine is in motion.

1.2 Which ONE of the following safety measures applies to a tensile tester?
A. Apply excessive pressure on the tester.
B. Use a hammer to reverse the tester.
C. Lower the fluid level of the tester.
D. Keep your fingers clear of the moving parts.

1.3 A Rockwell tester is used to test the ... of a material.
A. hardness
B. elasticity
C. toughness
D. yield strength

1.4 Which ONE of the following is a reason for a high carbon-monoxide reading on an internal combustion engine?
A. High compression
B. Worn valves
C. A faulty air filter
D. Surface defects

1.5 The second arrest temperature (Ac1) for carbon steel is ...
A. 1 000 °C
B. 120 °C
C. 320 °C
D. 800 °C

1.6 The minimum diameter of a screw thread is measured at the ... of the screw thread.
A. root
B. axis
C. flank
D. lead

1.7 What is the gear ratio of a Cincinnati dividing head used on a milling machine?
A. 60 : 1
B. 50 : 1
C. 5 : 1
D. 30 : 1

1.8 Which ONE of the following is a common cause of incomplete penetration into a welded joint?
A. The welding current was too low
B. Slag not removed from the first weld before the second weld was run
C. Faulty restart by not restarting at the top of the previous weld run
D. Dirty or wet electrodes used when arc welding

1.9 What does the X-ray test on a welded joint detect?
A. External defects
B. Internal defects
C. Surface defects
D. Visual defects

1.10 One (1) Pascal can be expressed as...
A. 1 kg acting on 1 m².
B. 1 kg acting on 1.7 m².
C. 1 kg acting on 1 cm².
D. 1 kg acting on 1 mm².

1.11 What is discussed by Young’s elasticity modulus?
A. The force value required to produce a unit area in a tensile test specimen
B. The ratio between stress and strain in a material, provided that the limit of elasticity is not exceeded
C. The measurement of the extension or contraction of a rod under the load
D. The ratio of the deformation because of the application of an external force

1.12 What is represented by point D on the stress-strain graph shown in FIGURE 1.1?
A. The limit of proportionality
B. The limit of elasticity
C. The minimum stress
D. The maximum stress

1.13 Where is extreme pressure (EP) oil used?
A. In the engine
B. In power steering
C. In gearboxes
D. In hydraulic systems

1.14 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?
A. 5 000 r/min
B. 2 500 r/min
C. 2 000 r/min
D. 1 000 r/min

1.15 The function of a supercharger fitted to an internal combustion engine is to compress air by a... action.
A. electronic
B. mechanical
C. electrical
D. analogue

1.16 What do you understand by the term boost in respect of turbochargers?
A. The pressure that a turbocharger creates in the inlet manifold
B. Where the blower is placed before the carburetor
C. The centrifugal force to create decompression of the inlet force
D. Where the blower is placed after the carburetor

Various options are provided as possible answers to the following questions - NSC Mechanical Technology Fitting and Machining - Question 1 - 2017 - Paper 1

Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Mechanical Technology Fitting and Machining - Question 1 - 2017 - Paper 1

Which ONE of the following safety measures applies to a power saw?

Which ONE of the following safety measures applies to a tensile tester?

A Rockwell tester is used to test the ... of a material.

Which ONE of the following is a reason for a high carbon-monoxide reading on an internal combustion engine?

The second arrest temperature (Ac1) for carbon steel is ...

The minimum diameter of a screw thread is measured at the ... of the screw thread.

What is the gear ratio of a Cincinnati dividing head used on a milling machine?

Which ONE of the following is a common cause of incomplete penetration into a welded joint?

What does the X-ray test on a welded joint detect?

One (1) Pascal can be expressed as...

What is discussed by Young’s elasticity modulus?

What is represented by point D on the stress-strain graph shown in FIGURE 1.1?

Where is extreme pressure (EP) oil used?

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?

The function of a supercharger fitted to an internal combustion engine is to compress air by a... action.

What do you understand by the term boost in respect of turbochargers?

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