This document presents 10 electrical and electronics laboratory circuits explored and researched by Mohammed Imran, Assistant Professor of Electrical and Electronics Engineering, along with contributions from 4 mechanical engineering students. The circuits include brake tests on DC compound, shunt, and series motors; speed control of a DC shunt motor; load characteristics of a DC shunt generator; load testing of a 3-phase induction motor; open and short circuit tests on a transformer; measurement of power using the two-wattmeter method; magnetization characteristics of a DC separately excited generator; and applications of Thevenin's and Norton's theorems. Diagrams and notes are provided for each circuit.

1. E.C.M LAB CIRCUITS
(ANIMATED)
RESEARCHED AND PRESENTED BY-
Mohammed Imran
( ASSISTANT PROFESSOR)
DEPARTMENT OF ELECTRICAL AND ELECRONICS ENGINEERING
CONTRIBUTIONS BY-
-Abrar Rafat (MECHANICAL 2nd year)
-Syed Ateeq (MECHANICAL 2nd year)
-Zia Ul Haq (MECHANICAL 2nd year)
-Mohammed Maqsood (MECHANICAL 2nd year)

2. 1.BRAKE TEST ON DC COMPOUND MOTOR
220 V,
D.C.
SUPPLY
BRAKE DRUM
S1
S2
DPST
DPST
FUSE
FUSE
V
A
Z
ZZ
YY
Y
M
AA
A
4 POINT STARTER
L Z
0-300V,M.C.
0-20A,M.C.
L
-
A
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD

3. 2.SPEED CONTROL OF DC SHUNT MOTOR
220 V,
D.C.
SUPPLY
DPST
DPST
FUSE
FUSE
A
M
3 POINT STARTER
L Z A
515 Ω
min
V
A
AA
Z
100 Ω
Max.
0-300V,M.C.
0-5A,M.C.
ZZ
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD

4. 3.BRAKE TEST ON DC SERIES MOTOR
220 V,
D.C.
SUPPLY
BRAKE DRUM
S1
S2
FUSE
FUSE
V
A
YY
Y
M
AA
A
2 POINT STARTER
L A
0-300V,M.C.
0-20A,M.C.
+
-
DPST
DPST
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD

5. 4.BRAKE TEST ON DC SHUNT MOTOR
220 V,
D.C.
SUPPLY
DPST
DPST
FUSE
FUSE
A
M
3 POINT STARTER
L Z A
ZZ
V
0-300V,M.C.
S1
S2
BRAKE DRUM
0-15A,M.C.
A
Z
AA
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD
100ohms min

6. 5.LOAD CHARCTERISTIC OF DC SHUNT
GENERATOR
220 V,
D.C.
SUPPLY
FUSE
FUSE
M
3 POINT STARTER
L Z A
ZZ A
AA
G
A
AA
A
ZZ
A
V
Z
Z
L
O
A
D
0-2A,M.C.
0-20A,M.C.
0-300V
M.C.
DPST
DPST
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD
100Ω MAX

7. 6.LOAD TEST ON 3-PHASE
INDUCTION MOTOR
3 phase
415 v
supply
R
Y
B
N
STAR/DELTA STARTER
R
Y
B
A
V
0-10,M.I
5/10 A,300/600 upf
fuse
fuse
fuse
TPST
TPST
TPST Brake drum
S1 S2
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD
0-600v,M.I

8. 7.OPEN AND SHORT CIRCUIT TEST ON A
TRANSFORMER
A
V OPEN CIRCUIT
M L
C V
1- phase A.C
supply
A
V
SHORTCIRCUIT
M L
C V
1- phase A.C
supply
fuse
fuse
fuse
fuse
0-300v, MI
0-1A, MI
0-15A,MI
0-75V, MI
AUTO TRANSFORMER
HIGH VOLTAGE RATED
AUTO TRANSFORMER
HIGH CURRENT RATED
PH
DPST
DPST
DPST
DPST
N
PH
N
L1
L2 H1
H2
L1
L2
H1
H2
2.5/5A,150/300V lpf
15/30A,75/150V upf
Red Common mistakes

9. 8.MEASUREMENT OF POWER BY TWO
WATTMETER METHOD
3 phase
415 v
supply
R
Y
B
STAR/DELTA STARTER
R
Y
B
A
V
0-10,M.I
5/10 A,300/600 upf
fuse
fuse
fuse
TPST
TPST
TPST Brake drum
S1 S2
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD
0-600v,M.I
M
C
V
L
L
5/10 A,300/600 upf
V
M
C
600
600

10. 9.MAGNETISATION CHARACTERISTICS Of
DC SPEARATELY EXCITED GENERATOR
V
220v
Dc
supply
FUSE
FUSE
FUSE
FUSE
DPST
DPSTDPST
DPST
3 POINT STARTER
L Z A
M G
A
SPST
220v
Dc
supply
0-1 A,M.C
0-300V,M.C
ZZ
Z
ZZ
Z
A
AA
A
AA
1000 Ω /A
Max.
NOTE:- 1. RED common mistakes
2. FUSE RATING WILL BE 125%
OF FULL LOAD
100 Ω
min

11. 10.THEVENINS THEOREM
230 V,1Phase,A.C
Supply
DPST
DPST
R P S
0-30V
R 1 R 2
R 3 Vth R L
Circuit to find Vth
A
B

12. R1 R2
R3 RL
Circuit to find Rth
Rth

13. 230 V,1`-Phase,A.C
Supply
DPST
DPST
R P S
0-30V
R 1 R 2
R 3
A
B
A
I load
Rl

14. NORTONS THEOREM
230 V,1Phase,A.C
Supply
DPST
DPST
R P S
0-30V
R 1 R 2
R 3 ISC R L
Circuit to find Isc
A
B
A

15. NORTONS THEOREM
R1 R2
R3 RL
Circuit to find RN
Rn

16. NORTONS THEOREM
230 V,1-Phase,A.C
Supply
DPST
DPST
R P S
0-30V
R 1 R 2
R 3 R L
Circuit to find IL
A
B
A
D.R.B
I load