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

The appropriate alloy metal for fittings of hot-water copper pipes is brass. Brass is favored because of its strength, excellent machinability, and resistance to wear, which ensures durability and reliability in plumbing applications.

For hammers used in explosive atmospheres, the suitable alloy metal is bronze. This metal is selected because it does not generate sparks, reducing the risk of igniting flammable materials.

An example of where high-tensile steel is used on a farm is in the manufacturing of tow bars, which are essential for towing equipment and supplies.

Cast iron is commonly used in the production of engine blocks for tractors, providing strength and durability required for heavy-duty applications.

The annealing process of copper involves heating the metal to a temperature range of 500-550°C. After heating, the copper is cooled either in air or by submerging it in sand, which helps relieve internal stresses and enhances its ductility.

The two most important aspects to consider are: (1) Type of material to be joined, ensuring compatibility with the adhesive, and (2) Conditions under which the joint will be used, which affects adhesive performance.

Before applying adhesive, it is crucial to clean the surface area around the crack thoroughly. This involves sanding lightly to remove any dirt or debris, which ensures a better bond when applying the adhesive.

Two methods used to join fibreglass parts include: (1) Pop rivets and (2) Screws.

To add colour to a fibreglass trough, two methods can be employed: (1) Painting and (2) Dying the fibreglass material.

Extreme heat has minimal effect on Bakelite; however, it can become extremely hot and may discolour when exposed.

When subjected to extreme heat, Perspex can easily change shape, burn, or even melt due to its low heat resistance.

Silicon will melt and deform when exposed to extreme heat, impacting its structural integrity and usability.

Vesconite is known for its low static and dynamic friction ability. It exhibits no friction in tough working environments, whether dry or wet, when lightly or heavily loaded, making it an excellent bearing material.

The three design requirements for warning signs on electric fences are: (1) The signs must be at least 100 mm x 200 mm in size, (2) The background color of both sides must be yellow, and (3) The inscription must be black and read 'BE AWARE – ELECTRIC FENCE.'

Two situations where an electrical fence could be utilized on a farm are: (1) For protection against intruders, and (2) As a barrier for dangerous animals, such as lions.

Two alternative energy sources suitable for powering an electrical fence include: (1) Solar energy and (2) Wind energy.

The three components necessary to create a fire are: (1) Material that can burn, (2) Oxygen, and (3) An ignition source (friction, matches, lighter).

Two reasons for using resin casting as an insulating material include: (1) It provides Water-tightness, and (2) It acts as a non-conductor of electricity, thus preventing short circuits.