Vskills has developed a new strategic framework for Skill Development for early school leavers and existing workers, especially in the unorganized sector to improve their employability called Trade Employable Skills (TES).

Trade Employable Skills does effective assessment and certification of candidates in different trade disciplines like Electrical, Electronics, Agriculture, Chemical, Automobile, IT, etc to make them job ready.

Why should one take this certification?

To demonstrate clear understanding and practical aspects and to get a visible recognition for this knowledge.

Table of Content

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

Practice Test

https://www.vskills.in/test/

Companies that hire Refrigeration and Air-conditioning Electro Mechanics Technician

All small and medium companies need certified employees who have the requisite skills. There are more jobs opening up in the economy on a regular basis with the fast growth of the country.

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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
“Exam scheduling to be done through user account” / “Exam once scheduled cannot be cancelled”
Date of Examination
07-Oct-2017
08-Oct-2017
21-Oct-2017
22-Oct-2017
05-Nov-2017
18-Nov-2017
02-Dec-2017
03-Dec-2017
16-Dec-2017
17-Dec-2017
Examination Time
01:00 PM - 02:00 PM
02:30 PM - 03:30 PM
04:00 PM - 05:00 PM
05:30 PM - 06:30 PM
10:00 AM - 11:00 AM
11:30 AM - 12:30 PM

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Tags: refrigeration, air conditioner, technician, air conditioner technican, refrigerator technician, repair