Electrician Second year Syllabus

DC machines

Practical

107. Identify terminals, parts and connections of different types of DC machines.

108. Measure field and armature resistance of DC machines.

109. Determine build up voltage of DC shunt generator with varying field excitation and performance analysis on load.

110. Test for continuity and insulation resistance of DC machine.

111. Start, run and reverse direction of rotation of DC series, shunt and compound motors.

Theory

General concept of rotating electrical machines.

Principle of DC generator. Use of Armature, Field Coil, Polarity, Yoke, Cooling Fan, Commutator, slip ring and Brushes, Laminated core etc.

E.M.F. equation

Separately excited and self- excited generators.

Series, shunt and compound generators.

testing and maintenance of DC machines and motor starters

Practical

112. Perform no load and load test and determine characteristics of series and shunt generators.

113. Perform no load and load test and determine characteristics of compound generators (cumulative and differential).

114. Practice dismantling and assembling in DC shunt motor.

115. Practice dismantling and assembling in DC compound generator.

116. Conduct performance analysis of DC series, shunt and compound motors.

117. Dismantle and identify parts of three point and four-point DC motor starters.

118. Assemble, Service and repair three point and four-point DC motor starters.

119. Practice maintenance of carbon brushes, brush holders, Commutator and sliprings.

Theory

Armature reaction, Commutation, inter poles and connection of inter poles.

Parallel Operation of DC Generators.

Load characteristics of DC generators.

Application, losses & efficiency of DC Generators.

Routine & maintenance.

Principle and types of DC motor. Relation between applied voltage back e.m.f., armature voltage drop, speed and flux of DC motor.

DC motor Starters, relation between torque, flux and armature current.

Changing the direction of rotation.

Characteristics, Losses & Efficiency of DC motors. Routine and maintenance.

DC Motor Winding

Practical

120. Perform speed control of DC motors - field and armature control method.

121. Carry out overhauling of DC machines.

122. Perform DC machine winding by developing connection diagram, test on growler and assemble.

Theory

Methods of speed control of DC motors.

Lap and wave winding and related terms.

AC Three Phase Motor

Practical

123. Identify parts and terminals of three phase AC motors.

124. Make an internal connection of automatic star-delta starter with three contactors.

125. Connect, start and run three phase induction motors by using DOL, star- delta and auto-transformer starters.

126. Connect, start, run and reverse direction of rotation of slip-ring motor through rotor resistance starter and determine performance characteristic.

127. Determine the efficiency of squirrel cage induction motor by brake test.

128. Determine the efficiency of three phase squirrel cage induction motor by no load test and blocked rotor test.

129. Measure slip and power factor to draw speed- torque (slip/torque) characteristics.

130. Test for continuity and insulation resistance of three phase induction motors.

131. Perform speed control of three phase induction motors by various methods like rheostatic control, autotransformer etc.

Theory

Working principle of three phase induction motor.

Squirrel Cage Induction motor, Slip-ring induction motor; construction, characteristics, Slip and Torque.

Different types of starters for three phase induction motors, its necessity, basic contactor circuit, parts and their functions.

Single phasing prevention.

No load test and blocked rotor test of induction motor.

Losses & efficiency. Various methods of speed control.

Braking system of motor. Maintenance and repair.

AC Three Phase Motor Winding

Practical

132. Perform winding of three phase AC motor by developing connection diagram, test and assemble.

133. Maintain, service and troubleshoot the AC motor starter.

Theory

Concentric/ distributed, single/ double layer winding and related terms.

AC Single Phase Motor

Practical

134. Identify parts and terminals of different types of single-phase AC motors.

135. Install, connect and determine performance of single-phase AC motors.

136. Start, run and reverse the direction of rotation of single-phase AC motors.

137. Practice on speed control of single-phase AC motors.

138. Compare starting and running winding currents of a capacitor run motor at various loads and measure the speed.

Theory

Working principle, different method of starting and running of various single-phase AC motors.

Domestic and industrial applications of different single- phase AC motors.

Characteristics, losses and efficiency.

AC Single Phase Motor Winding

Practical

139. Carry out maintenance, service and repair of single-phase AC motors.

140. Practice on single/double layer and concentric winding for AC motors, testing and assembling.

141. Connect, start, run and reverse the direction of rotation of universal motor.

142. Carry out maintenance and servicing of universal motor.

Theory

Concentric/ distributed, single/ double layer winding and related terms.

Troubleshooting of single-phase AC induction motors and universal motor.

Alternator, Synchronous Motor and MG Set

Practical

143. Install an alternator, identify parts and terminals of alternator.

144. Test for continuity and insulation resistance of alternator.

145. Connect, start and run an alternator and build up the voltage.

146. Determine the load performance and voltage regulation of three phase alternator.

147. Parallel operation and synchronization of three phase alternators.

148. Install a synchronous motor, identify its parts and terminals.

149. Connect, start and plot V- curves for synchronous motor under different excitation and load conditions.

150. Identify parts and terminals of MG set.

151. Start and load MG set with 3 phase induction motor coupled to DC shunt generator.

Theory

Principle of alternator, e.m.f. equation, relation between poles, speed and frequency. Types and construction.

Efficiency, characteristics, regulation, phase sequence and parallel operation.

Effect of changing the field excitation and power factor correction.

Working principle of synchronous motor.

Effect of change of excitation and load.

V and anti V curve.

Power factor improvement.

Rotary Converter, MG Set description and Maintenance.

Electronics Practice

Practical

152. Determine the value of resistance by colour code and identify types.

153. Test active and passive electronic components and its applications.

154. Determine V-I characteristics of semiconductor diode.

155. Construct half wave, full wave and bridge rectifiers using semiconductor diode.

156. Check transistors for their functioning by identifying its type and terminals.

157. Bias the transistor and determine its characteristics.

158. Use transistor as an electronic switch and series voltage regulator.

159. Operate and set the required frequency using function generator.

160. Make a printed circuit board for power supply.

161. Construct simple circuits containing UJT for triggering and FET as an amplifier.

162. Troubleshoot defects in simple power supplies.

163. Construct power control circuit by SCR, Diac, Triac and IGBT.

164. Construct variable DC stabilized power supply using IC.

165. Practice on various logics by use of logic gates and circuits.

166. Generate and demonstrate wave shapes for voltage and current of rectifier, single stage amplifier and oscillator using CRO.

Theory

Resistors – colour code, types and characteristics.

Active and passive components. Atomic structure and semiconductor theory.

P-N junction, classification, specifications, biasing and characteristics of diodes.

Rectifier circuit - half wave, full wave, bridge rectifiers and filters. Principle of operation, types, characteristics and various configuration of transistor.

Application of transistor as a switch, voltage regulator and amplifier.

Basic concept of power electronics devices.

IC voltage regulators Digital Electronics - Binary numbers, logic gates and combinational circuits.

Working principle and uses of oscilloscope.

Construction and working of SCR, DIAC, TRIAC and IGBT.

Control Panel Wiring

Practical

167. Design layout of control cabinet, assemble control elements and wiring accessories for:

(i) Local and remote control of induction motor.

(ii) Forward and reverse operation of induction motor.

(iii) Automatic star-delta starter with change of direction of rotation.

(iv) Sequential control of three motors.

168. Carry out wiring of control cabinet as per wiring diagram, bunching of XLPE cables, channeling, tying and checking etc.

169. Mount various control elements e.g. circuit breakers, relays, contactors and timers etc.

170. Identify and install required measuring instruments and sensors in control panel.

171. Test the control panel for its performance.

Theory

Study and understand Layout drawing of control cabinet, power and control circuits.

Various control elements: Isolators, pushbuttons, switches, indicators, MCB, fuses, relays, timers and limit switches etc.

Wiring accessories: Race ways/ cable channel, DIN rail, terminal connectors, thimbles, lugs, ferrules, cable binding strap, buttons, cable ties, sleeves, gromats and clips etc.

Testing of various control elements and circuits.

AC-DC Motor Drives

Practical

172. Perform speed control of DC motor using thyristors / DC drive.

173. Perform speed control and reversing the direction of rotation of AC motors by using thyristors / AC drive.

174. Construct and test a universal motor speed controller using SCR.

Theory

Working, parameters and applications of AC / DC drive. Speed control of 3 phase induction motor by using VVVF/AC Drive.

Voltage Stabilizer, Invertor and UPS

Practical

175. Assemble circuits of voltage stabilizer and UPS.

176. Prepare an emergency light.

177. Assemble circuits of battery charger and inverter.

178. Test, analyze defects and repair voltage stabilizer, emergency light and UPS.

179. Maintain, service and troubleshoot battery charger and inverter.

180. Install an Inverter with battery and connect it in domestic wiring for operation.

Theory

Basic concept, block diagram and working of voltage stabilizer, battery charger, emergency light, inverter and UPS.

Preventive and breakdown maintenance.

Power Generation and Substations

Practical

181. Draw layout of thermal power plant and identify function of different layout elements.

182. Draw layout of hydel power plant and identify functions of different layout elements.

183. Visit to transmission / distribution substation.

184. Draw actual circuit diagram of substation visited and indicate various components.

Theory

Conventional and non- conventional sources of energy and their comparison.

Power generation by thermal and hydel power plants.

Solar Panel

Practical

185. Prepare layout plan and Identify different elements of solar power system.

186. Prepare layout plan and Identify different elements of wind power system.

187. Assemble and connect solar panel for illumination.

Theory

Various ways of electrical power generation by non-conventional methods.

Power generation by solar and wind energy.

Principle and operation of solar panel.

Transmission and Distribution

Practical

188. Practice installation of insulators used in HT/LT line for a given voltage range.

189. Draw single line diagram of transmission and distribution system.

190. Measure current carrying capacity of conductor for given power supply.

191. Fasten jumper in pin, shackle and suspension type insulators.

192. Erect an overhead service line pole for single phase 230V distribution system in open space.

193. Practice on laying of domestic service line.

194. Install bus bar and bus coupler on LT line.

Theory

Transmission and distribution networks.

Line insulators, overhead poles and method of joining aluminum conductors.

Safety precautions and IE rules pertaining to domestic service connections.

Various substations.

Various terms like – maximum demand, average demand, load factor, diversity factor, plant utility factor etc.

Circuit Breakers and Relays

Practical

195. Identify various parts of relay and ascertain the operation.

196. Practice setting of pick up current and time setting multiplier for relay operation.

197. Identify the parts of circuit breaker, check its operation.

198. Test tripping characteristic of circuit breaker for over current and short circuit current.

199. Practice on repair and maintenance of circuit breaker.

Theory

Types of relays and its operation. Types of circuit breakers, their applications and functioning.

Production of arc and quenching.

Electrical Vehical

Practical

200. Demonstrate different charger specifications.

201. Perform installation of EV charging Station for Public places.

202. Perform installation of Home EV charging stations.

Theory

EV scenario in India and EV Charging basic theory.

EV Charging safety requirements.

ENGINEERING DRAWING

Reading of Electrical Sign and Symbols.

Sketches of Electrical components.

Reading of Electrical wiring diagram and Layout diagram. Reading of Electrical earthing diagram. Drawing the schematic diagram of plate and pipe earthing.

Drawing of Electrical circuit diagram.

Drawing of Block diagram of Instruments & equipment of trades.

WORKSHOP CALCULATION & SCIENCE

Friction

Friction - Lubrication

Algebra

Algebra - Addition, subtraction, multiplication & division

Algebra - Theory of indices, algebraic formula, related problems

Elasticity

Elasticity - Elastic, plastic materials, stress, strain and their units and young’s modulus

Profit and Loss

Profit and loss - Simple problems on profit & loss

Profit and loss - Simple and compound interest

Estimation and Costing

Estimation and costing - Simple estimation of the requirement of material etc., as applicable to the trade.

Estimation and costing - Problems on estimation and costing

Project work / Industrial visit

a) Battery charger/Emergency light

b) Control of motor pump with tank level

c) DC voltage converter using SCRs

d) Logic control circuits using relays

e) Alarm/indicator circuits using sensors