2.1 Name the alloy metal that is specifically used to manufacture EACH of the following products and give a reason why the metal is used: 2.1.1 Wine tanks 2.1.2 Fitting for hot-water copper pipes 2.1.3 Hammers that can be used in an explosive atmosphere 2.2 Give ONE example of where the following materials are used on a farm - NSC Agricultural Technology - Question 2 - 2022 - Paper 1

Brass is the alloy metal used for fittings in hot-water copper pipes. It is chosen for its strength, good machinability, and resistance to wear. Brass fittings maintain their structural integrity under high temperatures, making them suitable for this application.

Bronze is the alloy used for hammers in potentially explosive atmospheres. It does not generate sparks upon impact, which is critical for safety in such environments. Its low friction characteristic also contributes to its suitability.

An example of where high-tensile steel is used on a farm is in the construction of tow bars.

Cast iron is found in engine blocks, such as those used in tractors.

The annealing process of copper involves heating the metal to a temperature between 500°C and 550°C, followed by cooling it gradually in either the air or sand. This process softens the copper, making it more workable and relieving internal stresses.

The two most important aspects to consider are the type of material that needs to be joined and the conditions under which that joint will be used. These factors ensure that the adhesive chosen is suitable for the specific repair requirement.

To prepare the fibreglass water trough, first clean the surface area around the crack thoroughly. This involves sanding it lightly to remove any dirt and ensure that the surface is completely clean before applying the adhesive.

Two methods used to join fibreglass parts are pop rivets and bolts with nuts.

Two methods to add colour to a fibreglass trough include painting and dyeing.

Extreme heat will cause Bakelite to become extremely hot, and it will burn and discolor, but will not undergo any significant physical change.

When subjected to extreme heat, Perspex will easily change shape because it is not heat resistant. It will also melt as temperatures rise.

Silicon will melt and deform under extreme heat, losing its structural integrity.

Vesconite has low static and dynamic friction, making it suitable for various applications. There is no friction in tough working environments, whether dry or wet, lightly or heavily loaded, which enhances its performance.

1. The signs must be at least 100 mm x 200 mm.
2. The background color of both sides must be yellow.
3. The inscription must be black and should read 'BE AWARE—ELECTRIC FENCE.'

1. For protection against dangerous animals, such as lions.
2. To create temporary fences for crop areas.

1. Solar energy
2. Wind energy

1. Material that can burn
2. Oxygen
3. A heat source such as friction or matches.

1. Resin casting provides waterproofing, which protects electrical connections from moisture.
2. It prevents corrosion and rust, enhancing the durability and safety of the electrical joint.