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Certified AC-DC Motors Rewinding Mechanic

How It Works

  1. 1. Select Certification & Register
  2. 2. Receive a.) Online e Learning Access (LMS)    b.) Hard copy - study material
  3. 3. Take exam online anywhere, anytime
  4. 4. Get certified & Increase Employability

Test Details

  • Duration: 60 minutes
  • No. of questions: 50
  • Maximum marks: 50, Passing marks: 25 (50%).
  • There is NO negative marking in this module.
  • Online exam.

Benefits of Certification

Rs.3,499 /-

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

Practice Test

Companies that hire AC/DC Motors Rewinding Mechanic

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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Fundamental terms used in AC winding

  • Coil
  • Turn
  • Active side of a coil
  • Inactive side of a coil
  • Leads of a coil
  • Pole pitch
  • Coil pitch/span and coil throw
  • Pitch factors
  • Coil group
  • Coil connections
  • Pole connection
  • Whole-coil winding
  • Half coil winding
  • Single layer winding
  • Double layer winding
  • Balanced winding
  • Unbalanced winding
  • Concentrated winding
  • Distributed winding
  • Partially distributed winding
  • Fully distributed winding


  • Basket winding
  • Concentric winding
  • Skein winding
  • Flat loop Noon-overlapped winding
  • Flat loop overlapped or chain winding
  • Skew winding
  • Diamond coil winding
  • Involute coil winding
  • Electrical degrees
  • Phase displacement    

Table fan- terms- types of motors- winding details – data to be collected

  • Terminology pertaining to table fan as per I.S. 555-1979
  • Table type fan
  • Rated voltage
  • Rated speed
  • Blade sweep
  • Winding Shaded pole type table fan
  • Capacitor motor
  • Grouping of coils in table van
  • Procedure of preparing winding table for capacitor type table van
  • Determine the winding table for the arrangement of coils
  • Winding capacitor type table van
  • Data

Testing of windings

  • Continuity test/resistance test
  • Short circuit test/growler test
  • Internal growler method
  • Voltage drop method
  • Ohmmeter method
  • Polarity test
  • Magnetic compass method
  • Two screwdrivers method
  • Polarity test by search coil method
  • Unbalanced current test
  • No-load test

Insulating and varnishing process in electric machines

  • Air drying varnish
  • Baking varnishes
  • Thermosetting varnishes
  • Solvent less varnishes
  • Varnish thinners
  • Preheating
  • Impregnation process
  • Varnish stripping
  • End connections
  • Method of coil connections
  • Method of lead connections
  • Shaping and binding the overhangs

Rewind a ceiling van

  • Terminology used in ceiling fans
  • Capacitors
  • Suspensions system
  • Earthing
  • Insulation resistance
  • Method of stripping the winding of the ceiling van
  • Preparing the winding table for Ac single phase permanent capacitor type ceiling van
  • Whole coil connection
  • Winding calculations
  • Determine the coil group
  • Winding calculations
  • Determine the coil groups
  • Method of preparing former and winding coils
  • Method if winding van motor
  • Classification of insulation according to thermal class
  • Cuffing
  • Coil separator
  • Wedge separator/paking strip
  • Wedge
  • Overhang inter-phase insulation
  • Connections
  • Slot liner Cuffing
  • Coil separator
  • Wedge separator/paking strip
  • Wedge
  • Overhang inter-phase insulation
  • Connections

Single phase, split phase type motor winding (concentric coil winding)

  • Split phase type
  • Winding calculation and diagrams for concentric type winding

Winding a three phase induction motor – single layer distributed winding

  • Distributed type winding
  • Single layer winding
  • Calculation for single layer distributed winding
  • Method of overlapping
  • Overhang Insulation
  • End connections

Winding a three-phase induction motor – single layer concentric type – half coil connection

  • 3-phase concentric winding
  • Merits
  • Demerits
  • Grouping
  • Grouping of coils

Winding a 3 phase induction motor- double layer distributed type winding

  • Grouping
  • Coil throw
  • Winding sequence
  • End connections
  • Coil connections
  • Placing of the coils in double layer winding

Starter for 3-phase induction motor, its necessity – basic contactor circuit- its parts and their functions.

  • Necessity of starter
  • Selection of starter
  • Contactors
  • Power circuit
  • Control circuits
  • Push-button actuation from one operating location
  • Push-button actuation from two operating location
  • Purpose of overload relays
  • Magnetic overload relay
  • Bimetallic overload relay
  • Relay setting
  • Tripping of starters
  • No-volt coil
  • Coil voltages
  • Troubleshooting in contactor

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