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.
![Image of a coiled spring]
2. List THREE properties of Vesconite that makes it possible for use ... show full transcript
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 can be medium carbon steel, spring steel, or bronze.
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 soften when subjected to wet conditions.
It remains hard in water, ensuring dimensional stability.
Step 3
List THREE commercial uses of Teflon.
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Teflon is used in all-weather clothing for its non-stick properties.
It is commonly used in cookware, particularly non-stick pans.
Teflon is also utilized in various electrical applications for insulation.
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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Answer
Copper is an excellent conductor of heat and electricity.
It is malleable, allowing easy shaping into wires.
Copper resists corrosion and does not rust easily.
It is flexible, which aids in installation.
Step 6
Name FOUR properties of brass products that make it more suitable for use than steel products.
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Answer
Brass has lower friction properties, reducing wear.
It resists corrosion when exposed to seawater.
Brass is more durable than steel in certain applications.
It is non-magnetic, making it suitable for specific uses.
Step 7
Give TWO circumstances where bronze hammers are used instead of hammers made of steel.
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Answer
Bronze hammers are preferred in explosive atmospheres to prevent sparks.
They are used in the presence of flammable vapours to minimize fire risks.
Step 8
Describe the resin that is used in the making of glass fibre products.
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The resin used in glass fibre products is typically a thermosetting polymer, which hardens upon curing, providing structural integrity while maintaining flexibility.
Step 9
Give THREE reasons why glass fibre is preferred as a construction material for the manufacturing of small boats.
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Answer
Glass fibre is lightweight, leading to better speed and efficiency.
It is easily repaired when broken, allowing for maintenance.
The material is resistant to water, enhancing durability.
Step 10
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 operates by using the earth as a return path for the electric current. When an animal makes contact with the live wire, a circuit is completed, allowing current to flow from the wire to the ground, delivering a shock.
Step 11
State TWO possible causes of a voltage drop in the electric fence circuit.
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Answer
A poor connection in the circuit can cause a significant voltage drop.
High vegetation touching the wire can also result in reduced voltage due to grounding.
Step 12
Discuss the procedure that must be followed when testing the earth system of an electric fence.
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Answer
To test the earth system, first ensure the fence is powered. Use an earth tester to measure the voltage between the earth stake and the ground. Ensure it meets recommended levels, and if not, check for proper connections and stake placement, adjusting as necessary.
