(a) Name three other equipment that can perform similar functions as specimen F. (b) State five safety precautions to be taken when using specimen F. (c) De...

Specimen F is a knapsack (back-pack) sprayer.

(a) Three other equipment that perform similar functions as specimen F

1. Motorised (power) sprayer.
2. Hand (compression) sprayer.
3. Tractor-mounted or boom sprayer.

(b) Five safety precautions when using specimen F

1. Ensure the sprayer is in good condition and free of leaks before starting.
2. Read and follow the instructions on the chemical container, and mix the chemical at the correct concentration.
3. Wear protective clothing (overall, hand gloves, nose mask, goggles and boots).
4. Spray down-wind, never against the wind, and do not walk into freshly sprayed areas.
5. Do not eat, drink or smoke while spraying, do not clear a blocked nozzle with the mouth, and wash the body thoroughly after use.

(c) How specimen F is used

Pour a measured quantity of water into the tank, add the correct amount of chemical and mix well, then close the tank with its lid. Pump the lever to raise the pressure within the tank, mount the sprayer on the back, and direct the nozzle at the crops while walking steadily away from the sprayed area, pumping occasionally to maintain the pressure. After use, empty, wash and clean the tank.

(d) Three faults that may develop in specimen F when in use

1. Clogging (blockage) of the nozzle by dirt or undissolved chemical.
2. Leakage of chemical from the tank, hose or joints (or a ruptured hose).
3. Loss of pressure from the pressure chamber due to a worn or faulty pump lever/piston.