2.1 Indicate the alloy metal that is specifically used to manufacture the following products and give TWO reasons why the metal is used: 2.1.1 Milk tanks 2.1.2 Fittings for hot-water copper pipes 2.1.3 Hammering tools that can be used in explosive atmospheres 2.2 Name TWO hot-working processes that can be used to change the structural properties of brass - NSC Agricultural Technology - Question 2 - 2018 - Paper 1

For fittings used in hot-water copper pipes, brass is the preferred alloy. Brass is known for its strength and machinability, which allows for ease of installation. Its wear resistance and hardness ensure that the fittings maintain functionality over time, while its corrosion resistance ensures durability in hot-water applications.

Bronze (specifically Beryllium Copper) is preferred for hammering tools used in explosive atmospheres. This metal does not generate sparks, is low friction, and resists corrosion, ensuring both safety and effectiveness when used in sensitive environments.

1. Annealing: This process involves heating brass to a specific temperature and then allowing it to cool slowly to relieve stresses and improve malleability.

2. Tempering: This process is applied to provide toughness and reduce brittleness by reheating the metal after it has been hardened.

1. Lightweight: Fiberglass troughs are easier to move around compared to heavy concrete troughs, making them more convenient for farmers.

2. Easy to fix/repair: They can be easily repaired or replaced if damaged, offering flexibility that concrete does not.

The resin used in fiberglass production is characterized as low viscosity fluids that can be transformed into durable, flexible solids by adding a hardening agent. This transformation allows for various applications in manufacturing and construction.

1. Pop rivet: A method where a metal riving is used to join fiberglass panels effectively.

2. Bolts and nuts: A mechanical fastening method that can secure fiberglass parts together.

1. Marine applications: Vesconite is ideal for many marine environments due to its resilience.
2. Non-seizing: It does not swell or seize, ensuring smooth operation.
3. Low friction: It has a low coefficient of friction, enhancing performance.
4. No asbestos: Vesconite does not contain harmful materials such as asbestos, making it safer for users.
5. Easy to machine: Its properties allow it to be easily fitted and machined for various applications.

To ensure effective adhesion:

1. Clean the surface: Ensure the surfaces are free from dust and grease.

2. Roughen the surface: If the surface is too smooth, it can be sanded slightly to provide better grip for the adhesive.

3. Thin application: Apply a thin layer of adhesive; a thick layer may not bond effectively.

4. Reciprocation: Apply adhesive to both surfaces to ensure complete bonding.

1. Short out the live fence line to the ground: This ensures that there is no voltage in the system while testing.

2. Switch the energizer ON: Activate the electric fence energizer to gather readings.

3. Measure voltage: Use a voltmeter to measure the voltage between the ground and the earth spike.

4. Check efficiency: If the voltage measured is above 200 volts, the installation of the electric fence may need improvement.

1. Farm security: Electric fences are commonly used to secure perimeters against intruders.

2. Temporary fences: They can be employed as temporary fencing for livestock management.

1. Wind energy: Harnessed through wind turbines to generate electricity.

2. Solar energy: Captured through solar panels to power electric fencing systems.

3. Water energy: Utilized through hydroelectric systems to contribute to power supply.