Explanation

(a) Advantages of using specimen A include:

• Tractor is used in drawing farm implements like ploughs, harrows, ridgers, planters,
• It can also be a stationary power source for equipment like shellers, threshers, grinders etc.
• It has hydraulic control system which aids the lifting of coupled implements.
• It is used to carry farm inputs like chemicals, fertilizers, seeds etc. from one section of the farm to another.
• It can also be used to carry harvested crops or other products from the farm to the market.
• It can also be used to transport farm workers within the farm.
• lt is used to clear bush, cultivate land, plant crops, weed and apply pesticides.
• It can contribute to improved profitability by reducing labour costs, improving quality and quantity of produce 
• Allow an increase in the size on the farm.

(b) Maintenance practices that can be carried out daily on specimen A include:

• Keep the tractor clean by removing all trashes or mud from it at the start or at the end of operations.
• Check water levels daily and top it when necessary.
• Check oil level daily and top it when necessary.
• Check tyre pressure daily before operation.
• Inspect the tractor before starting every day.
• Check electrolyte of battery every day and top when necessary 
• Adhere strictly to manual or manufacturer's instructions.
• Do not overload the tractor i.e operate at appropriate speed for farm operations.

(c) Maintenance practices that should be carried out periodically on specimen A include:

• The tractor should be serviced at regular intervals.
• Worn-out tyres Should be replaced.
• Ensure that nuts, screws or shield are checked and tightened at regular intervals.
• Replace worn-out parts of the tractors
• Employ a competent and experienced tractor operator.

(d)(i)The type of fuel used by specimen A is diesel
(ii) No, ie. it does not require spark plug.

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