Table of Content
 

Electrical safety
  • Safety practice – first aid
  • Electric shock
  • Effects of electric shock
  • Treatment of electric shock
  • Electric burns
  • Burns and scalds
  • Severe bleeding
  • Immediate action
  • To control severe bleeding
  • Large wound

Basic hand tools – screwdrivers, pliers and tweezers

  • Basic hand tools
  • Screwdrivers
  • Length of blade L and width of tip W
  • Straight wings and tapered wings
  • Instrument screwdrivers
  • Impact screwdrivers
  • Special types of screwdrivers
  • Using a screwdrivers
  • Pliers
  • Diagonal cutter plier
  • End cutting plier
  • Flat nose pliers
  • Round nose pliers
  • Long nose pliers
  • Combination pliers
  • Circlip pliers for external circlip
  • Circlip pliers for internal circlips
  • Pliers used by electrician
  • Tweezers

Joints in electrical conductors

  • Definition of joints
  • Types of joints
  • Pig-tail/rat p tail/twisted joint
  • tee joint
  • Britannia joint
  • Britannia tee joint
  • Western union joint
  • scarfed joint
  • Plain tap joint
  • Aerial tap joint
  • Knotted tap joint
  • Duplex cross-tap joint
  • Double-cross tap joint

Electrical soldering practice

  • what is soldering?
  • Necessity of soldering
  • Solder used for copper
  • Factors influencing the choice of a solder
  • Flux
  • General Properties of flux
  • Soldering methods
  • Soldering with a soldering iron
  • Soldering with a soldering gun
  • Soldering with a flame
  • Dip soldering
  • Techniques of soldering
  • Soldering with electric soldering iron
  • The electric soldering iron
  • The bit
  • Selecting the bit
  • Care of the bit
  • Dressing the bit
  • Cleaning the bit
  • Wetting (soldering)
  • Techniques of soldering
  • Tinning the soldering iron
  • Cleaning the surface to be soldered
  • Applying the flux
  • Applying the solder
  • Safety
  • Soldering with pot and ladle
  • Reconditioning of solder which is subjected to repeated melting
  • Soldering Aluminium cables
  • Soldiering od Aluminium cables
  • Solder
  • Flux
  • Procedure Of soldering Aluminium
  • Precaution to be followed while soldering Aluminium
  • Safety

Types of current

  • Types of electric supply
  • DC supply
  • Types of current
  • AC supply
  • Alternating voltage
  • Identification of instrument from the data given on the dial
  • Data contained on the measuring instrument dial
  • Measuring range and measuring units
  • Types of current
  • Testing potential
  • Using position
  • Accuracy class
  • Measuring instrument types
  • Indication error
  • Terminal markings
  • Reading instrument scales
  • Classification of instrument as per accuracy
  • Readingaccuracy
  • Indicators
  • Mirror scales
  • Zero adjustment
  • Types of scales
  • Coarse and coarse-fine scale
  • Fine scale
  • Extended scale
  • Linear scale
  • Non-linear scale
  • Sources of errors when measuring
  • Device errors
  • Influence errors
  • Switching errors
  • Human errors
  • Reading the scales
  • Precaution to be observed while using an instrument
  • Introduction of electricity – Ohm’s Law
  • Introduction
  • Simple electric circuit
  • Open circuit
  • Short circuit
  • Electric current
  • Si unit of electric charge
  • Electromotive force
  • Potential difference
  • Resistance
  • Ohm’s law
  • Application of ohm’s law
  • Ohm’s law verification
  • Power and energy in simple electrical circuit

Multimeter

  • Types of multimeters
  • Multimeter as a DC voltmeter
  • Multimeter as a DC ammeter
  • Multimeter as an ohmmeter
  • Multimeter as a AC voltmeter
  • Methods of measuring DC voltages
  • Method of measuring AC voltages
  • Method of measuring direct current
  • Method of measuring resistance
  • Method of use
  • Application of a multimeter
  • Types of a multimeter
  • Analogue types
  • Digital types
  • Comparison of analogue and digital multimeter
  • DMM functions
  • DMM displays
  • Multimeter- safety precautions

Measuring voltage and current using multimeter

  • Multi-range meters
  • Meter scales of multi-range meter
  • Identifying the scale tro take readings
  • Multimeter as DC VOLTMETER
  • Multimeter as DC AMMETER
  • Multimeter as AC VOLTMETER
  • Multimeter as AC AMMETER
  • Multi-meter as OHMMETER
  • Resistance zero setting

Dynamically induced EMF

  • Generator
  • Principle of the generator
  • Faraday’s laws of electromagnetic induction
  • Types of emf
  • Dynamically induced emf
  • Statically induced emf
  • Production of dynamically induced emf
  • Systems of connection in 3-phase AC
  • Methods of 3-phase connection
  • Star connection
  • Delta connection

Parts of a DC generator and their functions

  • DC motor – principle and types
  • Introduction
  • Principles of a DC motor

Applications of a DC series motor, shunt motor, compound motor

  • Uses of a DC series motor
  • Application of DC shunt motor
  • DC compound motor
  • Application of DC differential compound motor

Single phase motors – types – resistance/induction-start, induction-run motor

  • Working of split-phase motor
  • Application of resistance-start, induction-run motor
  • Induction-start, induction-run motor
  • Capacitor-start, induction-run motor
  • Application
  • Capacitors used in single phase capacitor motors
  • Capacitor-start, capacitor-run motor
  • Permanent capacitor motor
  • Capacitor-start, capacitor-run motors
  • Application

Transformers

  • Two- winding transformers
  • Auto transformers
  • Principle
  • Application

Secondary cell (lead acid)

  • Secondary cell
  • Terms and definitions
  • Electrolyte
  • Electrodes
  • Anode
  • Electrolysis
  • Electrochemical equivalent
  • Coulomb
  • Faraday’s laws of electrolysis
  • First law
  • Second law
  • Types of secondary cells
  • Lead acid cell
  • Charging secondary battery
  • Necessity of charging
  • Batterycharger
  • Charging current
  • Secondary cell/battery – care & maintenance
  • Care and maintenance of batteries
  • Precautions

Identifying, checking, finding value of fixed resistor

  • Resistors
  • Units of resistance
  • Classification of resistors
  • Fixed value resistors
  • Construction
  • Power rating
  • Resistors values- coding schemes
  • Colour band coding of resistors
  • Tolerance
  • Typo graphical coding of resistors
  • Application
  • Measuring ohmic value of resistors
  • Wire-wound resistors
  • Construction
  • Resistor values
  • Applications
  • Other types of resistors
  • Special types of fixed value wound resistors
  • Resistors lead bending
  • Types of resistor leads
  • Identifying, checking and finding value capacitors
  • Capacitor action of storing charge
  • Unit of Capacitance
  • SOLUTION
  • Factors that determine the value of capacitance
  • Working voltage or voltage rating of capacitor
  • Function of a dielectric in a capacitor
  • Types of capacitors
  • 1 Fixed value capacitors
  • 2 Variable capacitors
  • Specifications of capacitors
  • Types of capacitor
  • Capacitance Value
  • DC working voltage rating (DCWV)
  • Tolerance
  • Temperature coefficient

Testing of Capacitors

  • CONSTRUTIN OF CAPACITORS
  • COMMON DEFECTS IN ACITORS
  • Short circuited capacitors
  • Open capacitors
  • Leaky capacitors/ leakage resistance
  • Checking capacitors
  • Capacitor action – normal  resistance test
  • Charging – holding test on capacitors

Identification of  Rectifier Diodes

  • SEMICONDUCTORS
  • Semiconductor theory
  • Intrinisc semiconductors
  • Extrinisc semiconductor
  • N- type semiconductor
  • P- type semiconductor
  • P- type material
  • P- N junction
  • Type of diodes
  • Classification of Diodes
  • Point contact diodes
  • Junction diodes
  • Type of Diodes packaging
  • Testing rectifier diodes using ohmmeter
  • Polarity marking on the diodes
  • Type number or diode code number

Construct and test a bridge Rectifier

  • Important specification of a diodes
  • The JEDEC type code
  • The PRO- ELECTRON type code
  • The JIS type code
  • Diode equivalents
  • AC- to – DC conversion using diode – Half wave rectifier
  • RECTIFICATION
  • Calculation output DC level in half – wave rectifiers
  • Ripple frequency
  • Peak inverse voltage voltage
  • Full wave rectifiers
  • OutputDClevel in a two – diode full wave rectifier
  • Ripple frequency in a full wave rectifier
  • Peak inverse voltage
  • Current rating of diode in a full wave rectifier
  • Disadvantages of TWO DIODE full wave rectifier
  • The Bridge Rectifier
  • Output Dc level in a bridge rectifier
  • Ripple  frequency – Bridge rectifier
  • Peak inverse  voltage – Bridge  rectifier
  • Current rating of diodes  in bridge rectifier
  • Encapsulated bridge rectifier module

Identification and checking Transistors

  • INTRODCTION TO TRANSISTORS
  • CLASSIFICATION OF  TRANSISTORS
  • 1   Based on the semiconductor  used
  • 2   Based on the P and N junctions are  organized as shown in Fig 5
  • 3   Based on the power handling capacity of transis  - tors as shown in Table below (Fig 6 )
  • 4   Based on the frequency of application
  • 5   Based on the manufacturing method
  • 6    Based on the type of final packaging
  • 1 Junction test
  • 2 Quick turn-ON test

Temperature and pressure controls

  • Types of pressure controls
  • Purpose of the bellow type low pressure switch
  • Liquid line solenoid valve
  • The use, installation and  set  point of electronic thermostat ( Controller)
  • Indicators leads
  • Programming
  • Parameter Programming
  • Resistance temperature detector (RTD)
  • Description of the parameters

Electrical components

  • Deforst Timer
  • Clocks or timer
  • Defrost Heater
  • PTC relay
  • Staring Relay
  • Current ( magnetic ) relay
  • Solid state relay

Apply for Certification

https://www.vskills.in/certification/Vskills-Certified-Refrigeration-and-Air-conditioning-Electro-Mechanics-Technician