2.1 Explain why a copper hammer should be used, and not a steel hammer, when hammer work is done where flammable vapours are present - NSC Agricultural Technology - Question 2 - 2016 - Paper 1

1. Increases resistance to corrosion: Copper enhances the overall durability of the metal, making it more resistant to environmental factors.
2. Improves electrical conductivity: Alloys containing copper can carry electric current more efficiently, which is valuable in electrical applications.
3. Easy to alloy: Copper easily mixes with other metals, allowing for versatile alloy compositions that can be tailored to specific needs.

The process used to soften tempered brass products is called annealing.

Metal cans must be coated with a thin tin layer primarily to prevent corrosion of the metal surface and to protect the contents from contamination, ensuring that the food remains safe for consumption.

1. Silvery-white appearance: Tin has a shiny, silvery surface that makes it visually appealing.
2. Malleability: Tin is soft and can be easily shaped or rolled into thin sheets.
3. Resistance to rust: Tin resists oxidation, protecting metals from corrosion when used as a coating.

1. Chromium: Improves corrosion resistance and enhances hardness.
2. Nickel: Enhances formability and toughness at both high and low temperatures.
3. Manganese: Contributes to strength and protects against oxidation.

1. Surface cleanliness: Ensure that surfaces to be bonded are free from dust, oils, and contaminants that can weaken adhesion.
2. Surface roughness: Increasing surface area through roughening can enhance adhesive grip.
3. Application thickness: Optimal thickness of adhesive should be maintained to ensure effective bonding without compromising strength.

The substance added to resin to harden it when performing fibreglass repairs is called a hardener.

Vesconite is suitable for marine applications because it is resistant to water, does not corrode when exposed to salty environments, making it ideal for both submerged and exposed applications.

1. No hazardous fibres: Vesconite does not contain asbestos or other harmful fibres.
2. Non-toxic material: It does not release toxic elements during machining.
3. No poisonous fumes: Machining Vesconite does not produce any harmful gases.

1. Higher design load limit: Vesconite can support larger loads than white metal bushings.
2. Greater fatigue resistance: It lasts two to three times longer under fatigue conditions compared to white metal.
3. Dimensional stability: Vesconite does not shrink or expand like white metal, ensuring consistent performance.

1. Install lightning protectors: Use devices specifically designed to divert lightning strikes away from the energiser.
2. Disconnect the battery: Ensure the energiser is turned off and its battery is disconnected during thunderstorms.

1. Install it high: Position the energiser out of reach to deter theft.
2. Use a lockable casing: Encase the energiser in a secure metal or concrete structure to prevent unauthorized access.

1. Minimum dimensions: Signs must measure at least 100 mm x 200 mm.
2. Visibility: The color scheme should ensure visibility, with black inscriptions on a bright background.
3. Clear inscriptions: Signs should clearly read 'TAKE CARE - ELECTRIC FENCE!' on both sides.

1. Increase earth spikes: Use more spikes to enhance electrical grounding.
2. Regular connections: Connect the wire at regular intervals to ensure effective grounding.

1. Mounting height: Electric wires must be buried or erected at a height that prevents accidental contact by pedestrians.
2. Clear warning signs: Display visible signs around the fence indicating the presence of an electric fence to inform and protect the public.