1. Name the metal used to manufacture the coiled spring below - NSC Agricultural Technology - Question 2 - 2021 - Paper 1
Question 2
1. Name the metal used to manufacture the coiled spring below.
2. List THREE properties of Vesconite that makes it possible for use in marine applications.
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Worked Solution & Example Answer:1. Name the metal used to manufacture the coiled spring below - NSC Agricultural Technology - Question 2 - 2021 - Paper 1
Step 1
Name the metal used to manufacture the coiled spring below.
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Answer
The metal used to manufacture the coiled spring is typically medium carbon steel.
Step 2
List THREE properties of Vesconite that makes it possible for use in marine applications.
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Answer
Vesconite gives long life with low maintenance and low friction.
It is corrosion resistant and does not swell or seize when wet.
It remains hard in water, ensuring its durability.
Step 3
List THREE commercial uses of Teflon.
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All-weather clothing
Eyeglass lenses coating
Non-stick cookware
Step 4
What is the critical melting point of Teflon?
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The critical melting point of Teflon is approximately 327 °C.
Step 5
Name FOUR properties of copper that make it ideal for the manufacturing of electrical wires.
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Excellent conductor of electricity.
High ductility, allowing for easy shaping.
Flexibility, making it easy to install.
Resistance to corrosion, enhancing its durability.
Step 6
Name FOUR properties of brass products that make it more suitable for use than steel products.
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Higher resistance to corrosion.
Lower friction properties, reducing wear.
Better electrical conductivity.
Malleability, allowing for complex shapes.
Step 7
Give TWO circumstances where bronze hammers are used instead of hammers made of steel.
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In explosive atmospheres to prevent sparks.
When working with sensitive materials that may dent or scratch.
Step 8
Type of adhesive use of product
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Silicon - 2.7.1 Sealant/joining.
PVC Weld - 2.7.2 Joining PVC pipes/products.
Resorcinol - 2.7.3 Joining or sealing of wood products.
No more nails - 2.7.4 Alternative adhesive.
Step 9
Describe the resin that is used in the making of glass fibre products.
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Answer
The resin used in glass fibre products is typically a thermosetting resin, which hardens when cured. It’s known for its strong adhesive properties and is often comprised of epoxy or polyester.
Step 10
Give THREE reasons why glass fibre is preferred as a construction material for the manufacturing of small boats.
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Lightness, making boats easier to handle and faster.
High strength-to-weight ratio, which improves overall performance.
Resistance to corrosion, ensuring durability over time.
Step 11
Describe the working of the earth return system of an electric fence.
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Answer
The earth return system of an electric fence relies on grounding the electrical circuit. It sends a pulse down the live wire, which travels through the animal that touches it and returns to the grounding system, completing the circuit.
Step 12
State TWO possible causes of a voltage drop in the electric fence circuit.
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Damaged or corroded fence wire that increases resistance.
Poor connections at insulators or joints within the circuit.
Step 13
Discuss the procedure that must be followed when testing the earth system of an electric fence.
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To test the earth system, ensure safety first by turning off the power. Next, use an earth tester to check the voltage level of the earth ground. If the reading is below 500 ohms, the ground is acceptable; if not, improve ground connections and retest.
