(a) Describe the differences between a disc plough and a disc harrow. (b) (i) State when a farmer would choose a disc plough over a mouldboard plough. (ii) Explain the function of the scraper on a disc.

1. Describe the differences between a disc plough and a disc harrow. (10 mk)
2. State when a farmer would choose a disc plough over a mouldboard plough. (5 mk)
3. Explain the function of the scraper on a disc. (5 mk)

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A pulley with a diameter of 20 centimetres drives another pulley with a diameter of 10 centimetres. If the drive pulley rotates at 1,000 revolutions per minute, calculate the speed of the driven pulley. (b) Define velocity ratio.

1. A pulley with a diameter of 20 centimetres drives another pulley with a diameter of 10 centimetres. If the drive pulley rotates at 1,000 revolutions per minute, calculate the speed of the driven pulley. (15 mk)
2. Define velocity ratio. (5 mk)

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(a) State the safety rules to be observed when using a forge in a workshop. (b) (i) Name two tools used in forging. (ii) Describe the process of tempering steel.

1. State the safety rules to be observed when using a forge in a workshop. (10 mk)
2. Name two tools used in forging. (5 mk)
3. Describe the process of tempering steel. (5 mk)

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(a) Define the term scale as used in surveying. (b) (i) Convert a scale of 1:5,000 into a statement scale. (ii) If a distance on a map is 10 centimetres, calculate the actual ground distance in kilometres.

1. Define the term scale as used in surveying. (5 mk)
2. Convert a scale of 1:5,000 into a statement scale. (5 mk)
3. If a distance on a map is 10 centimetres, calculate the actual ground distance in kilometres. (10 mk)

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(a) Explain the maintenance procedures for a knapsack sprayer. (b) Discuss the importance of calibration before using a sprayer.

1. Explain the maintenance procedures for a knapsack sprayer. (10 mk)
2. Discuss the importance of calibration before using a sprayer. (10 mk)

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