a) Dry Bulb Temperature and Wet bulb Temperature
• Dry bulb Temperature is an indication of the sensible heat content of air-water vapour
mixtures
• Wet bulb Temperature is a measure of total heat content or enthalpy. It is the temperature
approached by the dry bulb and the dew point as saturation occurs.
…………………….2 marks
b) Maximum Demand and Power Factor
• Maximum demand is maximum KVA or KW over one billing cycle
• Power Factor Cos = kW/ KVA or kW = kVA cos
…………………….2 marks
c) Gross Calorific Value & Net calorific Value:
• Gross calorific value assumes all vapour produced during the combustion process is fully
condensed.
• Net calorific value assumes the water leaves with the combustion products without being
fully condensed.
• The difference being the latent heat of condensation of the water vapour produced during
the combustion process.
…………………….2 marks
d) 5S:
Housekeeping. Separate needed items from unneeded items. Keep only what is
immediately necessary item on the shop floor.
Workplace Organization. Organize the workplace so that needed items can be easily and
quickly accessed. A place for everything and everything in its place.
Cleanup. Sweeping, washing, and cleaning everything around working area immediately.
Cleanliness. Keep everything clean in a constant state of readiness.
Discipline. Everyone understands, obeys, and practices the rules when in the plant.
…………………….1 mark( any one of the above is sufficient)
d) Return on Investment:
ROI expresses the annual return from project as % of capital cost.
This is a broad indicator of the annual return expected from initial capital investment