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 a variety of acids and alkalis.

Copper is not suitable for manufacturing pipe fittings because it is too soft, which could lead to deformation under pressure or structural failure over time.

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

The three properties of brass include:

1. Strength - Brass has a good balance of strength and ductility.
2. Corrosion resistance - It provides excellent resistance to corrosion, particularly in marine environments.
3. Ductility - Brass can be easily shaped and molded without breaking.

Two important aspects to consider when selecting an adhesive are:

1. Type of material to be joined - The adhesive should be compatible with the materials being repaired.
2. Conditions under which this joint will be used - It is crucial to consider environmental factors, including temperature, moisture, and potential exposure to chemicals.

Heat resistance is an essential property of an adhesive, as it determines the adhesive's ability to maintain its integrity and bond strength under high temperatures. An adhesive with good heat resistance will not distort, melt, or lose its adhesive properties when subjected to elevated temperatures. This is particularly important in applications where the repaired item may be exposed to heat sources.

Duration of usability refers to the period of time during which the mixed adhesive remains usable before it sets. This is the window during which the adhesive can be applied to the surfaces.

Duration of cohesion, on the other hand, pertains to the time an adhesive will continue to bond after it has set. This includes how long the adhesive holds the materials together effectively under typical usage conditions.

The four characteristics that make fibreglass suitable for boat manufacturing include:

1. Lightness - Fibreglass is lightweight, enhancing the speed and maneuverability of small boats.
2. Watertightness - It does not absorb water, preventing deterioration.
3. Malleability - Fibreglass can be molded into various shapes easily during the manufacturing process.
4. Toughness - It possesses a high level of toughness and can endure impacts, making it ideal for marine environments.

Four precautionary measures include:

1. Store catalysts and accelerators safely - Always keep chemicals in a secure place to avoid accidents.
2. Wear gloves - Protect skin by wearing appropriate gloves, especially if sensitivity is a concern.
3. Use protective eyewear - To avoid irritation from resin splashes or fibreglass particles.
4. Work in a well-ventilated area - This helps mitigate the inhalation of harmful fumes released during work.

Part A is identified as the 'Earth spike.'

The device shown in the illustration is called an 'Energiser.'

Part B functions as the 'Insulator,' designed to fasten electrified wire to fence posts without losing energy through the posts.

Part B is typically made from ceramic or plastic.