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The pictures below show TWO types of lawnmowers - NSC Agricultural Technology - Question 5 - 2024 - Paper 1

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The pictures below show TWO types of lawnmowers. Answer the questions that follow. 5.1.1 Identify the power sources of mower A and mower B. 5.1.2 State TWO mainten... show full transcript

Worked Solution & Example Answer:The pictures below show TWO types of lawnmowers - NSC Agricultural Technology - Question 5 - 2024 - Paper 1

Step 1

5.1.1 Identify the power sources of mower A and mower B.

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Answer

Mower A is powered by electricity, while mower B is powered by petrol.

Step 2

5.1.2 State TWO maintenance tasks to be performed on mower B.

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Answer

  1. Check and replace the oil regularly to ensure the engine runs smoothly.
  2. Inspect the fuel system for leaks and ensure the fuel is clean.

Step 3

5.1.3 State TWO safety tips when working with lawn mowers.

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Answer

  1. Always wear appropriate personal protective equipment (PPE), like gloves and safety shoes, to ensure personal safety.
  2. Read the operator's manual thoroughly before operating the mower to understand its features and safety protocols.

Step 4

5.2.1 Identify the safety hazards depicted in EACH picture below.

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Answer

A. No safety screen in place. B. Damaged safety screen. C. Worker climbing over PTO-driving shaft/Bystanders that can be injured. D. Hands near moving parts/No safety screens.

Step 5

5.2.2 When setting up a hammer mill, it needs to be on a level surface. Do you agree with this statement? Motivate the answer.

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Answer

Yes, a hammer mill should be set up on a level surface to ensure that the mass of moving parts is distributed evenly across the bearings, reducing vibration and enhancing safety during operation.

Step 6

5.2.3 A PTO drive shaft can reach a rotational speed of up to 2 800 r/min. Determine how many revolutions will occur per second.

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Answer

The number of revolutions per second (r/s) can be calculated using the formula:

extRevolutionspersecond=2800extr/min60extmin/hour=46.66extr/s ext{Revolutions per second} = \frac{2800 ext{ r/min}}{60 ext{ min/hour}} = 46.66 ext{ r/s}

Step 7

5.3 Match EACH device in the table below with a use.

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Answer

5.3.1 - D 5.3.2 - B 5.3.3 - C 5.3.4 - A 5.3.5 - E

Step 8

5.4.1 Write, in tabular form, TWO advantages and TWO disadvantages of EACH type of baler.

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Answer

Bale TypeAdvantagesDisadvantages
Round bales1. Roofed storage not necessary.1. Not easily transported.
2. One-man operation.2. Must be handled mechanically.
3. Packing of bales is less time consuming.3. No automatic packing machines.
4. Relatively vast storage area.4. Easily roll down steep hills.
Rectangular bales1. Bales stored easily.1. Must be stored under roof.
2. Easier to pack onto the trailer.2. Higher labour needs.
3. Storage space optimally utilized.3. Time-consuming during stacking.
4. Easily handled by hand.

Step 9

5.4.2 Name TWO methods that can be used to load large bales onto a trailer.

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Answer

  1. Using a front-end loader or fork loader.
  2. Utilizing mechanical devices such as a conveyor belt.

Step 10

5.4.3 State TWO safety measures that need to be followed when bales are transported to the shed.

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Answer

  1. Only one person should be on the tractor to ensure safety.
  2. Ensure no one is allowed to sit on bales during transport to prevent accidents.

Step 11

5.5.1 Name the part that enables the lifting arms to start moving.

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Answer

The part that enables the lifting arms to start moving is the control lever.

Step 12

5.5.2 Name part A.

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Answer

Part A is the automatic depth control mechanism/sensitivity element spring.

Step 13

5.5.3 Explain what will happen to the plough if the top link, labelled B, is not connected when the tractor starts moving forward.

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Answer

If the top link is not connected, the plough will tend to lift out of the soil, resulting in inefficient operation as it will not penetrate properly.

Step 14

5.6 Identify the types of hydraulic cylinders shown in the pictures.

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Answer

5.6.1 - Single action hydraulic cylinder 5.6.2 - Excavator (double action hydraulic cylinder) 5.6.3 - Hydraulic press (single action hydraulic cylinder)

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