EEE lab manual Accoding to Rtu Syllabubs

1. Shri USB College of Engineering & Management
Aburoad
Experiment No:- 01
Objective:-
Assemble house wiring including earthing for 1-phase
energy meter, MCB, ceiling fan, tube light, three pin socket.
S.No
.
Viva Questions (to be answered in the Lab file)
1.
What are the ratings of switches used in house-wiring?
For simple switch = 5A and power plug = 15 A.
2.
What do you mean by phase?
It is the terminal of the supply which have some potential.
3.
What is stair case wiring?
In this, a device or lamp is operated by two switches from
different positions.
4.
What is the neutral ?
Neutral in electrical supply system provides the return path to
the supply.
5.
What is the significance of current ratings of switches.
It is the maximum current capacity that can be bear by the
switch.
6.
What is purpose of energy meter?
It records the energy or power consumed by the consumer.
7.
What do you mean by the one unit of energy meter?
One unit = 1 KWH.(kilo watt hour)
8.
What is purpose of stair case wiring?
Energy saving and utility service.
9. What are the types of energy meter in market?
(i) Induction type energy meter
(ii) Electronic energy meter
(iii) Smart card/prepaid energy meter.
108 ELECTRICAL & ELECTRONICS ENGINEERING LAB

2. (iv) Digital energy meter.
10. Switches are connect in neutral or phase?
Phase.
11. In House wiring equipments are connected in parallel or series?.
Equipments are connected in parallel.
12. How many wires are generally used in house wiring?
Two (one is phase and second is neutral).
13. Why house wiring is done in parallel?
Otherwise voltage will be different across each equipment.
14. The house hold load are generally of the nature?.
Inductive
15. What is the voltage level of house holds?
230 volt (phase to neutral) and 420 volts(phase to phase).
108 ELECTRICAL & ELECTRONICS ENGINEERING LAB

3. Experiment No:- 02
Objective:-
Prepare the connection of ceiling fan along with the regulator and
vary the speed.
S.No
.
Viva Questions (to be answered in the Lab file)
1.
What is the function of capacitor in ceiling fan?
Ans. It creates phase difference between running and starting
winding and provides starting torque.
2.
What is an auto transformer?
It provides constant input and a variable output voltage. It
has only one winding.
3.
Name the insulation used in ceiling fan?
Rubber, paper, varnish, Bakelite etc.
4.
Winding are fitted on stator or rotor of ceiling fan?
On stator side.
5.
What are the ratings of ceiling fan?
(i) 60 W, 350 rpm, 1-phase, 230 V, 50 Hz
(ii) 45 W, 350 rpm, 1-phase, 230 V, 50 Hz.
6.
What happens if capacitor terminals are interchanged?
There will be no effect on fan performance.
7.
What happens if running winding terminals are
interchanged?
Fan will start running in opposite direction..
8.
Which of the induction motor is self start?
Three phase induction motor.
9.
What do you mean by HP?
HP is used for horse power , which is the unit of power and
is equivalent to 746 Watt.
10.
Is single phase induction motor self starting or not?
No, 1-phase induction motor is not self starting because its
starting torque is very low.
11.
We can start a ceiling fan without using capacitor, Yes or
Not?
Yes, by providing it a torque in any direction but it rotates
slowly.

4. 12. Why the stator of fan is laminated?
To reduce eddy current losses.
13. Why ceiling fan is called as ceiling fan?
Because it hangs from the hook of the ceiling.
14.
What is the function of speed regulator?
It controls the input voltage of the motor. Thus controls the
flux produced hence speed controlled.
15.
Which motor is used in ceiling fan?
It is single phase squirrel cage permanent capacitor induction
motor.

5. Experiment No:-3
Objective:-
Prepare the connection of 1-Φ induction motor through 1-Phase
Auto- transformer and vary the speed.
S.No
.
Viva Questions (to be answered in the Lab file)
1.
The 1-Φ motors work on the principle of ?
Mutual Inductance.
2.
How many windings are done on stator of a 1-Φ induction
motor?
Two
3.
Name the windings are done on stator of a 1-Φ induction
motor?
Main/Running Winding or Auxiliary/Starting Winding.
4.
Which type of rotor is used in 1-Φ induction motor?
Squirrel Cage Type
5.
Name the metal used in squirrel cage rotor for bars & short
circuiting rings.
Aluminium or copper.
6.
Why the stator of an induction motor is laminated?
To reduce the eddy current losses.
7.
How many types of induction motor?
Two.
8.
What is the purpose of Auxiliary winding in a 1-Φ induction
motor ?
To make the motor self start.
9.
1-Φ permanent capacitor motor is specially used in?
Fans
10.
During running condition, if the starting winding of 1-Φ,
split phase induction motor is disconnected then the.
Motor will continue to rotate.
11.
The starting torque of a split-phase capacitor start induction
motor is
High.
12. Why does not a 1-Φ induction motor self started?
108 ELECTRICAL & ELECTRONICS ENGINEERING LAB

6. Due to lack of revolving field that creates torque or there is
only one field present and for torque production at least two
flux(field) required.
13.
What is the phase displacement in space between two
windings of 1-Φ induction motor?
The starting winding is displaced in space by 900
.
14.
By interchanging supply terminals of a 1-Φ induction motor
its direction of rotation is?
Not changed.
15. Which type of capacitor is used in 1-Φ capacitor start motor?
AC electrolytic (Non polarized).
Experiment No:-4
Objective:-
108 ELECTRICAL & ELECTRONICS ENGINEERING LAB

7. Prepare the connection of 3-Φ squirrel cage induction motor through 3-
Φ auto-transformer & vary the speed.
S.No
.
Viva Questions (to be answered in the Lab file)
1.
Name the types of induction motor?
i) Wound Rotor type or Slip ring type.
ii) Squirrel Cage Rotor type
2.
What is the speed of induction motor?
Ns = 120*f/p is the synchronous speed and base speed is less
than synchronous speed.
3.
How rotation of 3-Φ induction motor does reverse?
By changing any two phases.
4.
Why squirrel cage induction motor is more popular than slip-
ring induction motor?
Due to its simple, ruggedness, maintenance free operation.
5.
The 3-Φ induction motor works on principle of.
Mutual Inuction
6.
3-Φ winding in stator slots is displaced by
1200
apart
7.
At instant of starting the motor behave as a
Transformer
8.
At the instant of starting, the slip of the motor is?
Unity i.e. = 1
9.
What is slip speed?
The difference between synchronous speed & the rotor speed
is called slip speed.
10. The current at starting of 3-Φ induction motor is
High
11. In split phase motors, the starting winding has less or more
X/R ratio than running winding?
Less
12.
The direction of rotation of a split phase induction motor can
be reversed by?
Either reversing the connections of main winding or auxiliary
winding.
13. The magnetic field produced in stator is rotating magnetic
field?
Yes
14. Name the type of starters used for 3-Φ induction motor

8. starting?
Direct online (DOL) starter, star-delta or autotransformer.
15. What is the mathematical expression of slip speed?
S= Ns - NR
Experiment No:-5
Objective:-
Prepare the connection of Fluorescent Lamp, Sodium Vapour and
Halogen Lamp and measure voltage, current and power in the circuit.
S.No Viva Questions (to be answered in the Lab file)
108 ELECTRICAL & ELECTRONICS ENGINEERING LAB

9. .
1.
What is the range of visible light?
4 X10
−7
¿7 X10
−6
m
2.
Filament of Lamp is made by?
Tungsten
3.
What is the use of inert gas in lamps?
To prevent oxidation and minimize the heat loss of filament.
4.
Why filament is in coil shape?
This reduces the heat losses and increase efficiency.
5.
What is the composition of inert gases used in filament lamp?
85% Argon and 15% Nitrogen
6.
What is the approximate life of an incandescent lamp?
Approx 1000 working hours
7.
Name Some Phosphor Substances?
Calcium tangstate, Zinc silicate, calcium borate, calcium
silicate etc.
8.
Why oxidic coating is made on filament of tube light?
To increase the emission of electrons.
9.
What is starter?
This is an automatic switch which operates by the circuit
current.
10. What is the life of tube light
7500 working hours
11. What is life and efficiency of Na vapour lamp?
Life = about 6000 working hours.
Efficiency = 110 Km ems/watt.
12. How much time is taken by Na vapour lamp to full glow?
About 30 minute.
13. What is luminous flux?
It is the rate of energy indication in the form of light waves,
i.e. energy per second. Unit of it is lumen.
14. What is illumination?
It is the luminous flux received by a surface per unit area.
15. Why halogen lamp are popular than other lamp?
Due to its easy construction, installation, low cost etc.