1.1 Various options are provided as possible answers to the following questions - NSC Agricultural Technology - Question 1 - 2016 - Paper 1
Question 1
1.1 Various options are provided as possible answers to the following questions. Write down the question number (1.1.1–1.1.10), choose the answer and make a cross (X... show full transcript
Worked Solution & Example Answer:1.1 Various options are provided as possible answers to the following questions - NSC Agricultural Technology - Question 1 - 2016 - Paper 1
Step 1
1.1.1 The plasma cutting machine cuts the metal with a/an ...
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Answer
The correct answer is C: electric arc. This is because plasma cutting uses an electric arc to convert gas into plasma, which is capable of cutting metals.
Step 2
1.1.2 The best gas mixture for cutting thick steel with a plasma cutting machine is ...
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Answer
The correct answer is A: argon and hydrogen. This gas mixture is optimal for achieving high temperatures needed for cutting thick steel finely.
Step 3
1.1.3 Oxyacetylene cannot be used to cut ...
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Answer
The correct answer is C: stainless steel. Oxyacetylene cutting is generally not effective for stainless steel due to its unique properties.
Step 4
1.1.4 ... does not cause undercutting when doing MIG welding.
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Answer
The correct answer is C: a root gap that is too small. A root gap that is proper ensures penetration, minimizing the risk of undercutting.
Step 5
1.1.5 If you see black smoke emitting from the exhaust pipe of a compression ignition engine, it indicates a/an ...
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Answer
The correct answer is B: rich air fuel mixture. Black smoke typically signifies incomplete combustion due to excessive fuel in the mixture.
