NSC Mechanical Technology Automotive OHS Act: Choose the correct answer from t

Question

Choose the correct answer from those indicated by A, B, C or D and write your choice next to the question number IN YOUR ANSWER BOOK.

1.1 Which ONE of the following statements is a basic rule for safe handling of a hydraulic press?
A. Make sure the work piece is sturdy in position
B. Your max exceed the recommended pressure
C. Two-off supports may be used
D. Use a hammer to get the work piece into position

1.2 What safety measure is applicable to the active line in terms of the Occupational Health and Safety Act, 1993 (Act 85 of 1993)?
A. All surfaces of the machine must be tiled.
B. Guards could be removed during maintenance.
C. Do not do any adjustments while the machine is running.
D. Always remember that measuring instruments are active.

1.3 The following apparatus is used on a milling machine to divide a work piece into even divisions:
A. Machine vice
B. Dividing head
C. Compound slide
D. Change gears

1.4 What is a function of a multi-meter?
A. To determine the forces in materials
B. To analyze materials
C. To analyze fuel mixtures.
D. To measure temperature.

1.6 When a metallic specimen is heated at a uniform rate, its temperature rises evenly to 700 °C. The temperature remains constant for a while, then it begins to cool off, whilst the thermal stresses remain constant for a while. 
A. Decreased point.
B. Higher critical point.

1.7 Which ONE of the following is an advantage of down-cut milling?
A. Vibration experienced is less.
B. Coarse feed may be used.
C. The finish obtained is finer.
D. The strain on the cutter and arbor is less.

1.8 Which lathe operation is shown in FIGURE 1.8?
A. Facing
B. Turning
C. Reaming
D. Boring

FIGURE 1.8

1.10 Which ONE of the following tests is a destructive test?
A. X-ray test
B. Dye penetration test
C. Nick-break test
D. Ultrasound test

1.11 Shielding the arc and molten pool from atmospheric gases is the function of the …
A. inert gas.
B. outlet gas.
C. plasma.
D. filler mixture.

1.12 What is understood with the term Young’s modulus of Elasticity?
A. The amount of load required to produce a unit area in a tensile test specimen
B. The elastic limit of a material, provided that the limit of proportionality is not exceeded
C. The ratio of stress to strain
D. The amount of elongation or contraction of material due to the application of an external force

1.13 The unit for strain:
A. Is newton
B. Is pascal
C. Is watt
D. Has no unit

1.14 Which ONE of the following is the purpose of lubrication?
A. To reduce friction
B. To reduce wear
C. To prevent corrosion
D. All the above-mentioned

FIGURE 1.15

SAE 20W50 oil, as illustrated in FIGURE 1.15 above, is used for …
A. engine lubrication.
B. gearbox lubrication.
C. differential lubrication.
D. automatic gearbox lubrication.

1.16 Which ONE of the following is a function of a friction clutch?
A. It supports light radial loads.
B. It transmits power at high speeds.
C. It supports high-pressure loads.
D. It carries a combination of radial and axial thrust loads.

1.17 FIGURE 1.17 shows three gears meshing.

GEAR A (DRIVER)        GEAR B         GEAR C (DRIVEN)

What is Gear B called?
A. Helical gear
B. Rack
C. Idler gear
D. Pinion

1.18 Determine the speed ratio of a racing cycle that uses the chain and sprocket system as shown in FIGURE 1.18 above.
A. 2.5 : 1
B. 25 : 1
C. 25 : 25
D. 1 : 5

1.19 Which ONE of the following classifications of turbines is used for internal combustion engine applications?
A. Turbocharger
B. Roots blower
C. Centrifugal blower
D. All the above-mentioned

1.20 Choose the advantage of a turbocharger over a supercharger from the following options:
A. The turbocharger makes use of diesel to operate.
B. The turbocharger makes use of exhaust gases (waste) to operate.
C. The turbocharger does not require the use of petrol to operate.
D. The turbocharger makes use of an engine to operate.

Choose the correct answer from those indicated by A, B, C or D and write your choice next to the question number IN YOUR ANSWER BOOK - NSC Mechanical Technology Automotive - Question 1 - 2017 - Paper 1

Worked Solution & Example Answer:Choose the correct answer from those indicated by A, B, C or D and write your choice next to the question number IN YOUR ANSWER BOOK - NSC Mechanical Technology Automotive - Question 1 - 2017 - Paper 1

1.1 Which ONE of the following statements is a basic rule for safe handling of a hydraulic press?

1.2 What safety measure is applicable to the active line in terms of the Occupational Health and Safety Act, 1993 (Act 85 of 1993)?

1.3 The following apparatus is used on a milling machine to divide a work piece into even divisions:

1.4 What is a function of a multi-meter?

1.6 When a metallic specimen is heated at a uniform rate, its temperature rises evenly to 700 °C. The temperature remains constant for a while, then it begins to cool off, whilst the thermal stresses remain constant for a while.

1.7 Which ONE of the following is an advantage of down-cut milling?

1.8 Which lathe operation is shown in FIGURE 1.8?

1.10 Which ONE of the following tests is a destructive test?

1.11 Shielding the arc and molten pool from atmospheric gases is the function of the …

1.12 What is understood with the term Young’s modulus of Elasticity?

1.13 The unit for strain:

1.14 Which ONE of the following is the purpose of lubrication?

1.16 Which ONE of the following is a function of a friction clutch?

1.17 What is Gear B called?

1.18 Determine the speed ratio of a racing cycle that uses the chain and sprocket system as shown in FIGURE 1.18 above.

1.19 Which ONE of the following classifications of turbines is used for internal combustion engine applications?

1.20 Choose the advantage of a turbocharger over a supercharger from the following options:

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