- Workshop & Personal Safety - Introduction to basic workshop tools & operations like measuring, marking, hacksawing & cutting. Tools used, their identification & classification, use care & maintenance, direct & indirect measurements,
- marking media.
| - Introduction to files, their types and uses, care & maintenance, Bench & pipe vice, their constructional details & uses. Sprit levels & their uses, straight and angular measurements, Bevel Protractors.
- Introduction to precision measuring & least count. Micrometers, Venires & Height gauges.
| - Constructional details, applications, care & maintenance.
- Dial gauge Vernier& indicator.
- Drilling, tapping & reaming, types of drills & reamers, different drilling operations, dies & die stocks.
- Drilling machines, their types & uses, holding devices & fixtures.
- Types of fasteners, threads.
- Adhesives & their
- applications.
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- Introduction to sheet metal work & its applications, materials used for sheet metal work.
- Hand tools, measuring tools & gauges used in sheet metal work.
- Different sheet metal operations, their necessity & applications.
| - Sheet metal joining processes, Sheet metal machinery, shears, forming & folding machines, bending & shearing machines seaming & nibbling machines.
- Development of surfaces for simple objects like boxes, cylinders, cones, prism & pyramids.
- Riveting practice, practice on removing dents on spherical &
- hemi spherical articles.
| - Timber, its classification &sources, seasoning of timber.
- Plywood & alternative materials. Carpentry tools, their uses, care & maintenance, simple carpentry operations & commonly used joints. Glues & adhesives, polishing & varnishing.
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- Workshop & personal safety - Metal joining processes.
- Introduction to gas & arc welding, advantages & disadvantages.
- Different hand tools are used in welding.
- Oxy- Acetylene gas welding plant.
- Welding accessories like regulators, nozzles cylinders, etc.
- Handling, setting of pressure.
| - Welding machines & welding transformers, welding processes & positions, welded joints, welding symbols, weld depositions, & electrodes, their types & selection, care & maintenance.
- Distortion in welding, welding defects, their causes & remedial measures.
| - Importance of brazing joint in R&A/C sector Selection of nozzle, Setting of line pressure. Importance of Right temperature of Brazing.
- PPE is required when brazing.
- Preparation before brazing, Swaging method, Flaring method filler rods, Fluxes, types & application.
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- Safety - in electrical shops. Introduction of AC, DC Current Static & current Electricity, Description, specification, general care & maintenance of common electrical hand tools.
- Wires & cables - conductors, Insulators & semiconductors, their shapes, and sizes with respect to low, medium & high voltage.
- Different fluxes for different purposes on metals, Crimping equipment -Single & Multistranded conductors joining.
- Selected letters symbols and sign as per I. S. I. Rules for medium voltage.
| - Resistance, Voltage, Current, open circuit and short circuits- Ohm's law - Voltage drop in series & parallel circuits, Power & energy relations, Electrical measuring Instruments, Multimeters, Insulation Testers.
- Common electrical accessories used in Industries, Bus-bars, Relays, Contactors, Circuit Breakers, etc.
- Fuses and their ratings, materials used.
- Earthing & its importance.
- Preventive maintenance, routine & periodical tests.
| - Induction principles - Electro- magnetism- Faraday's Laws.
- Single phase & Poly phase system 3 phase star-delta connections, Impedance & power factor - Principles & Applications of DC Motors, Series, Shunt & compound motor - AC Motors.
- Transformers their types and applications.
- Chemical effect of electric current - Rechargeable batteries - Care & maintenance of cells.
- AC Motor starting with DOL Starter and Star - Delta Starter.
- Panel boards & their design.
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- Use of electrical Control Instruments.
- Joints on single and stranded conductors and soldering.
- Care & maintenance and running of A. C.
- Single and poly phase motor, starters, and transformer.
- Single phase motor starting methods like RSIR, PSC, CSIR & CSCR and the use of Current and Potential relays.
- Measurement of current, voltage, power, and energy by voltmeter, Ammeter, wattmeter & energy meter.
- Measurement
- of resistance with Ohm Meters Formation of simple electrical circuit, series circuit, and parallel circuit, measuring insulation resistance & earth resistance.
- Verification of Ohm's law in D.C Circuit, Fixing and connecting electrical switches, holders fuses, plug sockets on T.
- W. Board and testing.
| - ELECTRONICS
- Introduction to Electronics. Basic Principles of semiconductors, Principles, and application of Diodes.
- Identification of resistance value as colour code.
- Tools & Equipment used in Electronic trade.
- Fundamentals of electron theory -passive components semiconductor devices -Symbols - specifications - Diodes, Transistors, Uni-junction Transistor, Field effect Transistor Silicon Controlled Rectifier & ICs.
- Half wave, full wave & Bridge rectifier with filters, DC Power supply.
- Rectification and Rectifiers, zener diode as voltage regulator, Transistor parameters-CB, CC, CE configuration, amplification, photo diodes, transistors, multi vibrations CR & LR circuits, SCRs, UJTs &ICs.
- Multi-vibrator circuits and RC wave shaping
- Circuits.
- Wiring of SCR, UJT for power control circuits, applications of OP -AMP, Applications of photo transistor.
- Thermistor, RTDs, Electronic thermostat, principle of remote control & controllers.
- Use & specifications of contactors, starter & crankcase heater, etc.,Introduction to
- Microprocessors.
| - Introduction to basic refrigeration, job opportunities, Safety precautions, and first aids, Applications and History of Refrigeration, and Air conditioning principle & need.
- Fundamentals of Refrigeration, units and measurements, Pressure & its Measurements Introduction to refrigeration Tools & equipment, Heat and temperature.
- Types of heat and its measurement.
- Thermometers & thermometric conversions.
- Atmosphere, air & its constituents.
- Properties of gases & gas laws. Measurement of pressure. Pressure gauges.
- Humidity, relative humidity & due point temperature.
- Constructional details of a refrigerator.
- Functions of
refrigeration system components i.e., condensers, evaporators and capillary tube. - Compressor, its types & working principle.
Reciprocating compressors. - Comparative study of sealed & open type compressors, Internal construction of a sealed compressor, its part & their functions.
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- Electrically & mechanical testing of refrigerator components. i.e. condensers, evaporators, capillary tube, Relay, OLP, Compressor Terminal find out, defective compressor identification & remedy.
| - Difference types of joint Procedure for temporary, Semi, and permanent Brazing Processes.
- Defects & remedial measures.
- Introduction to soldering & brazing, and their applications. Brazing Vs welding.
- Advantages & disadvantages. Maintenance of tools, instruments, and equipment.
| - Compressor lubrication method. Lubricants & their properties.
- Selecting of lubricant for the refrigerant sector.
- Cleaning & flushing of the system with chemical cleaning & flushing.
- Special about safety.
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- Environmental effect of refrigerant, Action taken, Alternative refrigerant.
| - Status & states of the refrigerant in every spot of the cycle, Recovery, recycling of refrigerant & their procedure.
| - Types of Refrigeration systems, Study the construction and working of the vapor compression cycle, low side & high side components of vapor compression system like, compressor, condenser, expansion valve and evaporator, functions and applications of
above components. |
- Electrical circuit diagram of refrigeration cycle Refrigerator, Freezer, Bottle cooler.
| - Repairing rewiring & servicing of a refrigerator. Carrying with R-134a Leak testing in the system Evacuation & gas charging of a refrigerator.
- Trouble shooting of
electrical & mechanical faults - Study of Frost Free Refrigerators, Refrigeration system of Frost Free Refrigerators, components & their functions, electrical components, wiring, automatic defrost.
| - Working on soft copper tubing like cutting, bending, flaring, swaging, pinching & preparing flare joints.
- Brazing of tube joints (Cu to Cu, Cu to Steel, Cu to Brass) using (i)Air-LPG (ii) 02- LPG (iii) 02-C2 H2 set up & use of the above gases with the right torches, Brazing Filler Rods.
- Distinguishing good joints from bad joints.
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- Cleaning, Flushing, replacing capillary and drier, fault rectification, Advantage of proper evacuation, leak testing, gas charging in window A/C Refrigerant charging.
| - Air cleaning: Filters, their types, and specifications. Air flow measurements Use of velocity meters. Performance Testing criterion.
- Scope and methodology of retrofitting HFC appliances with HC blend refrigerants, study of
- refrigerator components using
HC refrigerants. - Comparative study of the performance of refrigerators using different refrigerants.
- Comparative study of appliances available in the market.
| - Split type, its past, present & Introduction to Air conditioning future.
- Air conditioning
Fundamentals. - Constructional details and functioning of room air conditioner.
- Air circulation system. Psychrometric & psychrometric charts, construction & use of sling psychrometer.
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- Components of Split A.C. Role Study of mechanical & electrical of each part.
- Split A.C. its constructional details,
comparison with window air conditioner advantages & Disadvantages. - Air cooled condensers: Constructional details & selection.
| - Principles of pipe sizing & study of services valves for charging at the site.
- Principle of working of infra red remote control, study of electronic circuits.
| - Testing all weather air conditioners.
- Trouble shooting electrical & mechanical faults.
- VRV/VRF system, Frost Free Refrigerator.
- (Double and Three doors) Identify faults; rectify defects, installation method, study wiring circuit, evacuation, leak testing & gas charging, and installation.
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- Proper Installation procedure of Window A/C, Normal Split A/C Customer orientation service report preparation, Dealing with customers Proper Installation procedure of Duct able A/C, Cassette A/C.
| - Types of insulation U-Value EER calculation as star rated calculation Checking and servicing Preventive maintenance and Trouble Shooting.
- Retrofitting with Hydrocarbons and HFC134a
- a) Water storage, distribution, and drainage
- b) Refrigeration system using R-
- 22 and components in lieu of R-
- 12, Retrofitting with HFC-134a & HCs
- c) Electrical and control system working and control, soldering of copper tubes with stainless steel, Trouble shooting of commonly faced problems like condenser Fan Failure, corrosion, etc.
| - Deep Freezers description, Construction, and function, Low temperature thermostat, different types of deep freezer construction.
- Substituting R-22 with R-134a or Hydrocarbon (Montreal protocol)
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