DC Motor Replace and Regulate, Adapter maintenance, Compressor, Cooling Chamber, Hot Chamber, Pressure Tank, High Pressure Switch, Low Pressure Switch, Solinoid,Bottom Air Charge Pressure, W.T.P, S.T.P, I.R.F, Z.L.D, E.T.P, D.M, Water Fitering by using P.P/ sediment  Filter, Box/Gac/UTF Carbon, CTO/Net Carbon, RO Membrane, Test & Order, Mineral,  Alkaline. Manupulate Mechanical Elements such as Flush Bulbs, Flow Bulbs, Flots Switch, Volve bulbs, Albo,  Plastic Tank, Metal Tank, Fiber/Plastic Tank.

Current Electricity, Resistor, Combination of Cell, Magnetic effects of Current and Magnetism, AC, DC current and Circuit Diagram, Geometrical Optics, Physical optics, Modern Physics, Mass and Energy, Atomic Model and Nuclear Physics, Semiconductor and Electronics, Electrostatics, Thermodynamics, Dynamics, Vector, Newtonian Mechanics, Idea of Force, Field Intensity. Work, Energy and Power, Gravitation and Gravity, Structural Properties of Matter, Periodic Motion, Wave and Energy, Ideal Gas and Kinetic Energy, Electrical Applances, Generation of Electrical Power, Testing and maintannance, of Electrical Equipments, Switch Gear and Protection.