2.1 The picture below shows a stainless-steel milk tank used for storing fresh milk in the milking parlour - NSC Agricultural Technology - Question 2 - 2024 - Paper 1

Nickel can be added to stainless steel to enhance its resistance to air, water, and many acids and alkalis.

Copper is not a suitable material for the manufacturing of pipe fittings because it is too soft and can be easily deformed under pressure, which compromises the integrity of the fittings.

Zinc is the alloy element that is used with copper to create durable brass pipe fittings.

Three properties of brass include:

1. Strength – it has a good tensile strength.
2. Ductility – it can be easily shaped without breaking.
3. Corrosion resistance – it is resistant to rust and deterioration.

Three common uses of tin include:

1. Coating for other metals to prevent corrosion, such as tin cans.
2. Alloys, notably in solder and bronze.
3. A component in toothpaste as stannous fluoride.

Two important aspects to consider are:

1. The type of material to be joined – this affects the choice of adhesive.
2. The conditions under which the joint will be used – such as temperature and moisture levels.

Heat resistance is crucial for an adhesive as it determines the adhesive's ability to maintain its bond strength under elevated temperatures. An adhesive that can resist heat without distorting, burning, or losing effectiveness ensures longevity and reliability in applications exposed to high temperatures.

The duration of usability refers to the time period during which the mixed adhesive can be applied and still function effectively before it sets. In contrast, the duration of cohesion refers to the period after the adhesive has set, during which it continues to provide a strong bond between the materials it joins.

Four characteristics of fiberglass that make it suitable for boat manufacturing include:

1. Lightness – it enables easier handling and transportation.
2. Watertightness – it prevents water ingress, ensuring buoyancy.
3. Versatility – it can be molded into complex shapes.
4. Toughness – it can withstand impacts and rough handling.

Four precautionary measures include:

1. Store catalysts and accelerators properly to avoid accidental reactions.
2. Remove all resin and catalyst from the skin immediately to prevent irritation.
3. Wear gloves and suitable protective gear to minimize skin exposure.
4. Ensure adequate ventilation in the workspace to avoid inhaling any harmful particles.

Part A is the earth spike.

The device is known as an energizer.

Part B functions as an insulator, which is used to fasten electrified wire to fence posts, preventing the loss of electricity and maintaining the circuit.

Part B is manufactured from ceramic.