SNGCE/EE/CNF/CMELR 110

SREE NARAYANA GURUKULAM COLLEGE OF ENGINEERING

KADAYIRUPPU

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

LAB MANUAL FOR

ELECTRICAL WORKSHOP(CMELR 110)

FOR ALL BRANCHES

SEMESTER: ONE AND TWO

S1.No LIST OF EXPERIMENTS Page No.

1 Godown wiring 1

2 Wiring of one lamp and one plug 3

3 Wiring of mercury vapor lamp and CFL 5

4 Control of two lamps in series and parallel 7

5 Staircase wiring 9

Wiring of fluorescent lamp with magnetic andelectronic lamp

11

7 Hospital wiring 13

8 Wiring of distribution board 15

Measurement of Insulation resistance and Earthresistance

17

10 Identification of electronic components and solderingpractice

20

11 Testing of half wave and full wave rectifier withcapacitor filter

22

GODOWN WIRING

AIMTo prepare an estimate and wire up the circuit to control two lamps from two

switches such that one lamp is ON at a time.

TOOLS REQUIRED

Screwdriver, line tester, cutting plier, hammer, pocker.

PROCEDURE

Draw the layout diagram in wooden board provided for wiring. 20cm PVCwiring pipe is clamped with saddle as per diagram. Junction box is used to connectthe pipes. Wires are drawn through pipes and connections are done as per connectiondiagram. Fix the lamp holder. Check switching operation after connecting to acsupply.

RESULT

An estimate is prepared and wired up the circuit for given switchingoperation.

QUESTION

What are the different systems of wiring?

LAYOUT SWITCHIG OPERATION2

S1 S2 LI L2OFF C-1 DARK DARK

ON C-1 BRIGHT DARKON C-2 DARK BRIGHTOFF C-2 DARK DARK

20 20

2020

20

20

CONNECTION DIAGRAM

L2

Si S2

3

WIRING OF ONE LAMP AND ONE PLUG

AIM

To prepare a wiring such that one lamp is controlled by one switch with oneindependent plug point and to prepare estimate for the same.

TOOLS REQUIRED

Screwdriver, line tester, cutting plier, hammer, pocker.

PROCEDURE

Draw the layout diagram in wooden board . PVC channels are fixed inrespective positions. Tees are used to connect these channels. Wires are drawnthrough the channel and connections are done as per connection diagram. Fix thelamp holder. Channels are closed and tees are fixed at junctions. Verify switchingoperation after connecting to ac supply.

RESULT

A wiring is set up such that one lamp is controlled by one switch with oneindependent plug point and an estimation is prepared for the same.

QUESTION

Draw a neat diagram of a standard wire guage and explain how it is used tomeasure the size of a wire?

2 CI

20

PD S i

Lamp 60W, 250V

N

230V 50Hz IN

2.---1C/><T•

E

S1

LAYOUT

LI)20

CONNECTION DIAGRAM

NI

A

R

- Main Electrode

5

WIRING OF MERCURY VAPOUR LAMP AND CFLAIM

To prepare an estimation and wire up a circuit for mercury vapour lamp and CFL.

TOOLS REQUIRED

Screwdriver, cutting plier, line tester, hammer, pocker.

PROCEDURE

Draw the layout diagram in wooden board. Casing and caping is fixed on theboard. Wires are drawn through it and connections are done as per connectiondiagram. Circuit is verified by connecting to an ac supply.

RESULT

Wiring of mercury vapour lamp and CFL is done and an estimation isprepared for both mercury vapour lamp and CFL.

QUESTION

Explain the working of high pressure mercury vapour lamp?

MERCURY VAPOUR LAMP

Mercury Vapour Lamp

A - Auxiliary Electrode

230V 50Hz

2 0 20

230V 50Hz 20

( 9

Choke

p

Ca)

6MERCURY VAPOUR LAMP

LAYOUT CONNECTION DIAGRAM

Mercury Vapour Lamp

COMPACT FLOURESCENT LAMP

LAYOUT CONNECTION DIAGRAM

20 20N

230V 50Hz

20

C...S )

S1

CONTROL OF TWO LAMPS IN SERIES AND PARALLEL

AIM

To connect two lamps in series and parallel and to prepare the estimate for thesame.

TOOLS REQUIRED

Screwdriver, line tester, cutting plier, hammer, pocker.

PROCEDURE

Draw layout diagram in wooden board provided. 20cm PVC wiring pipe isclamped with saddle as per diagram. Junction box is used to connect these pipes.Wires are drawn through the pipes and connections are done as per connectiondiagram. Fix the lamp holder. Close the junction box. Verify the switching operationafter connecting to ac supply.

RESULT

A wiring is setup to control two lamps in series and parallel and an estimationis prepared for the same.

QUESTION

Why ACSR conductor is used for overhead lines?

7

8

LAYOUT

SWITCHING OPERATION

411020 20 20

20

20 20

Si S2 Ll L2

C-2 C-2 DIM DIM

C-1 C-1 BRIGHT BRIGHT

C-1 C-2 BRIGHT DARK

C-2 C-1 DARK DARK

CONNECTION DIAGRAM

S1

S2

STAIRCASE WIRING

AIM

To connect two switches in order to control one lamp so that it can becontrolled by each one independently. Also prepare the estimate for the same.

TOOLS REQUIRED

Screwdriver, line tester, cutting plier, hammer, pocker.

PROCEDURE

Draw layout diagram in wooden board provided. According to layout casingand caping is fixed on the board. Wires are drawn through it and connections are doneas per connection diagram. Fix the lamp holder. Verify the switching operation afterconnecting to ac supply.

RESULT

A wiring is setup to connect two switches in order to control one lamp so thatit can be controlled by each one independently. Also prepared the estimation for thesame.

QUESTION

What are different types of conductor materials?

9

10

LAYOUT

SWITCHING OPERATION

Si S2 L

C-1 C-1 BRIGHT

C-2 C-2 BRIGHT

C-1 C-2 DARK

C-2 C-1 DARK

CONNECTION DIAGRAM

L

1 2 3 0 V 5 0Hz

Si S2

WIRING OF FLUORESCENT LAMP WITH MAGNETIC ANDELECTRONIC CHOKE

AIM

Set up a wiring of fluorescent lamp with electronic and magnetic choke and toprepare an estimation for the same.

TOOLS REQUIRED

Screwdriver, Line tester, cutting plier.

PROCEDURE

Connections are done as per circuit diagram 1. Supply is given and circuitdiagram is tested. Then second diagram is set up and checked by connecting to acsupply.

RESULT

Wiring of fluorescent lamp with electronic and magnetic choke is done and anestimation is prepared for the same.

QUESTION

Explain the working of fluorescent lamp?

11

FLUORESCENT LAMP WITH MAGNETIC CHOKE

G1 cnvul type start e

23 OV SOHz

FLUORESCENT LAMP WITH ELECTONIC CHOKE

12

230V 50Hz

HOSPITAL WIRING

AIM

To prepare an estimate and wire up the circuit to control two lamps with twoswitches (one way switch and two way switch) so as to get both dim, both bright andonly one bright.

TOOLS REQUIRED

Screwdriver, cutting plier, line tester, hammer, pocker.

PROCEDURE

Draw layout diagram in wooden board provided. 20cm PVC wiring pipe isclamped with saddle as per diagram. Junction box is used to connect these pipes.Wires are drawn through the pipes and connections are done as per connectiondiagram. Fix the lamp holders. Close the junction box. Verify the switching operationafter connecting to ac supply.

RESULT

A circuit is wired up to control two lamps with two switches so as to get bothdim,both bright and only one bright and an estimation is prepared for the same.

QUESTION

Compare AC and DC systems of supply.

13

14

Si S2 Ll L2

C-1 ON BRIGHT BRIGHT

C-2 ON BRIGHT DARK

C-1 OFF DARK DARK

C-2 OFF DIM DIM

0 2 02

L i L-2)

2D 20

2 0 20C:D

14

LAYOUT SWITCHING OPERATION

CONNECTION DIAGRAM

L

1 f b 230v 50 Hz

S2

WIRING OF DISTRIBUTION BOARD

AIM

To perform wiring of distribution board including power plug using isolator,MCB, ELCB and to prepare the estimation for the same.

TOOLS REQUIRED

Screwdriver, line tester, cutting plier, hammer, pocker.

PROCEDURE

Draw layout diagram in wooden board provided. 20cm PVC wiring pipe isclamped with saddle as per diagram. Junction box and elbows are used to connectthese pipes. Wires are drawn through the pipes and connections are done as perconnection diagram. fix the lamp holder. Close the junction box and distributionbox . Verify the switching operation after connecting to ac supply.

RESULT

Wiring of distribution board including power plug using isolator, MCB,ELCB is performed and an estimation is prepared for the same.

QUESTION

Explain general rules for electrical installation in buildings?

15

PN

17

MEASUREMENT OF INSULATION RESISTANCE AND EARTH RESISTANCE

INSULATION MEGGARAIM

To measure the resistance of insulation using insulation meggar.

APPARATUS

Insulation meggar.

PROCEDURE

Terminals of the meggar are connected across the primary winding (A A') of atransformer whose resistance is to be measured. Similarly the secondary winding (BB') resistance is measured. Then the terminals are connected to the winding (B) andthe body of the transformer (C) and resistance is measured. Insulation resistancebetween primary and secondary winding is also measured.

RESULT

Resistance between terminals of primary winding =Resistance between terminals secondary winding =Insulation resistance between the winding and body of the transformer =Insulation resistance between the primary and secondary winding of transformer =

19.

EARTH MEGGARAIM

To measure the resistance of earth using earth meggar.

APPARATUS

Earth meggar, three aluminium rods, connecting wires, hammer.

PROCEDURE

Terminals C1 and P1 are shorted and is connected to earth electrode.10m ismeasured from the earth electrode and a rod is driven there. It is connected to C2.Another rod 2.5m from earth electrode is driven and connected to P2. Reading istaken. Then second rod is shifted to 5m from earth electrode and connected to P2.Reading is taken. The procedure is repeated for 7.5m from earth electrode. Averageof these three readings gives the earth resistance.

RESULT

Earth resistance =

QUESTION

Why switches and fuses are provided in phase line?

18

EarthMegger

EarthElectrode

INSULATION MEGGAR

InsulationMegger

21-A and 2-A' for primary winding resistance C1-B and 2-B' for secondary winding resistance1-B and 2-C for insulation resistance between winding and body1-A and 2-B for insulation resistance between primary and secondary winding

EARTH MEGGAR

19

20

IDENTIFICATION OF ELECTRONIC COMPONENTS ANDSOLDERING PRACTICE

AIM

Identification of electronic components.To practice soldering and to prepare the estimation for the same.To solder an IC base and wires in a PCB.Insert a logic gate in the IC base and verify its function using IC tester.

TOOLS REQUIRED

Soldering iron, lead, desoldering pump, leg strip, printed circuit board, wire,IC, cutting plier.

PROCEDURE

The given electronic components are identified. For soldering of copper wirethe steps are given belowFirst clean the leg strip. The insulation from the end of copper wire is removed andclean it. Then apply soldering paste to end of wire. When soldering iron is heatedplace the copper wire into the hole of the leg strip. Solder it to leg strip usingsoldering lead.To solder the pins of IC base to the PCB the same procedure is used. Insert an IC tothe IC base and truth table is verified using IC tester.Then desoldering is done using desoldering pump. For desoldering first heat thesoldering iron and melt the soldering paste with the desoldering pump. Removeconnection and clean leg strip.

RESULT

The given electronic components are identified and the soldering has beenpracticed and prepared the estimation for the same. Soldered an IC base and wires ina PCB. Inserted logic gate in the IC base and it's function is verified using IC tester.

QUESTIONS

Explain the working of soldering iron?What are the different factors to be considered to get good soldering joint?

nIcc. 4A 4B 41.- 3 A. 3 B_L4 113 r.2 [Li 1.1.0 9 I 8 1

7 4 0 8

5 1A 1E 1V 2A 2 B 2 Ir GIN

NAND

IC

TRUTH TABLE

21

1.1Gc40.. "=ID -•+ -"T 3A 3D 3y14 113 EL2 111 Fa 3 e I

7 4 CI

L 3' 4 I .51A 1_D 1Y ZA ED EY QT•ID

A B Y

0 0 1

0 1 1

1 0 1

1 1 0

AND

IC

TRUTH TABLE

A B Y

0 0 0

0 1 0

1 0 0

1 1 1

22

TESTING OF HALF WAVE AND FULL WAVE RECTIFIERWITH CAPACITOR FILTER

AIM

To prepare an estimate and to setup a half wave and full wave rectifierwith and without capacitor filter.

TOOLS REQUIRED

Diode, resistor,capacitor,transformer,bread board, wires.

PROCEDURE

The primary of transformer is connected to an ac supply. Thesecondary is connected to bread board. The insertion of wires into bread boardis done. Resistor, capacitor and diodes are also inserted into bread board as percircuit diagram. The output is taken across resistor and is connected to cathoderay oscilloscope. The output waveform is displayed on the CRO. Thewaveforms are obtained with and without capacitor filter.

RESULT

Testing of half wave and full wave rectifier with and without capacitorfilter is done.

QUESTION

Explain the working of half wave and full wave rectifier with andwithout filter.

230V 50Hz

•

CONNECTION DIAGRAM

Half Wave Rectifier

6

6

Full Wave Rectifier

1N4007

--+H-

--)

-:-5

C-

L

1

c_____________(-\_0

T

1000pF

To CRO

6-41—

1N4007

23