Aim :1. Construct a full wave rectifier.
PROCEDURE :-
1).Draw the circuit diagram.
2).Test the continuity of the primary and secondary winding of the given transformer.
3).Referring to fig follow order of steps given below.
-- Mount the test transformer on base board using suitable size nut,washer and bolt.
-- Mount the rectifier diodes on lug board soldering.
-- Solder the wire connection and the three core power cord.
4).Connect A.C main to the transformer ON main measure and record the main voltage and transformer secondary voltage Vs(rms).
5).measure the rectifier D.C voltage Vde across resistor RL using multimeter/ voltmeter.
PRECAUTIONS .
1).Connect diodes proper directions.
2).Do not lose contact on the base board of silicon diode
Aim:2. To measure the internal resistance of a battery.
PROCEDURE :-
1).Select the meter accessories,etc and connect as per diagram.
2).check connection for second time.
3). Not down the open circuit voltage of the battery.
4). close the switch ,s, and adjust the resistance to get the minimum readable current.
5). Not down the readings on voltmeter and ammeter.
6).Increase the current and repeat readings.
7). Note down the reading in table and calculate the result.
PRECAUTIONS.
1). Do not cut of the resistance completely when the switch is closed.
2). Do not increase the current more than rated current of the resistance.
3).Do not keep the circuit ON for long time.
Aim 3:- To control the speed of ceiling fan motor by the fan regulator.
PROCEDURE:-
1). Draw the connection diagram.
2).Not the name plate detail of the given ceiling fan motor.
3).Identify the terminal of the ceiling fan motor.
4). select the suitable range of regulator.
5).Connect the fan regulator in series with the fan regulator.
6).Switch ON the main supply.
7).Control the speed of the fan regulator by the rotary switch knob rotate of the regulator.
PRECAUTIONS.
1).Do not connect the regulator in parallel with the supply.
2).Increase the speed of the fan motor cut of the internal resistance step by step rotate the rotary switch
of the regulator.
Aim:4:- Measure of the resistance by using post office box.
PURPOSE:- Post office box connections selecting ratios- calculation of resistance.
Requirement
| SR.NO. | Tools/Instrument | Size | Qty | SR.NO. | Materials/Machinery | Size | Qty |
|---|---|---|---|---|---|---|---|
| 1 | Long nose plier | 200mm | 01 | 1. | Silicon diode | IN4007 | 02 |
| 2 | Connector screw driver | 75mm | 1 | 2 | Step down taransformer | 220/12-0-12 v | 1 |
| 3 | Side cutting plier | 150mm | 01 | 3 | Base board C.B | 2*2 | 01 |
| 4 | Electrician knife | 75mm | 01 | 4 | Flexible wire Red and Black colour | 7/0.36 | as requird |
1).Draw the circuit diagram.
2).Test the continuity of the primary and secondary winding of the given transformer.
3).Referring to fig follow order of steps given below.
-- Mount the test transformer on base board using suitable size nut,washer and bolt.
-- Mount the rectifier diodes on lug board soldering.
-- Solder the wire connection and the three core power cord.
4).Connect A.C main to the transformer ON main measure and record the main voltage and transformer secondary voltage Vs(rms).
5).measure the rectifier D.C voltage Vde across resistor RL using multimeter/ voltmeter.
PRECAUTIONS .
1).Connect diodes proper directions.
2).Do not lose contact on the base board of silicon diode
Aim:2. To measure the internal resistance of a battery.
Requirement
| SR.NO | Tools/Instrument | Size | Qty | SR.NO. | Materials/Machinery | Size | Qty |
|---|---|---|---|---|---|---|---|
| 1 | Insulated combination plier | 200mm | 01 | 1. | Rheostate wire wound | 1k ohm/50A | 01 |
| 2 | Connector screw driver | 75mm | 1 | 2 | Knife switch | 220v 50A | 01 |
| 3 | Electrician knife | 75mm | 01 | 3 | Battery | 12v | 01 |
| 4 | Volt meter M.C | 0025v | 01 | 4 | Wire pieces | 7/0.36 | as requird |
| 5 | Ammeter M.C | 0-50A | 01 |
1).Select the meter accessories,etc and connect as per diagram.
2).check connection for second time.
3). Not down the open circuit voltage of the battery.
4). close the switch ,s, and adjust the resistance to get the minimum readable current.
5). Not down the readings on voltmeter and ammeter.
6).Increase the current and repeat readings.
7). Note down the reading in table and calculate the result.
PRECAUTIONS.
1). Do not cut of the resistance completely when the switch is closed.
2). Do not increase the current more than rated current of the resistance.
3).Do not keep the circuit ON for long time.
Aim 3:- To control the speed of ceiling fan motor by the fan regulator.
Requirement
| SR.NO. | Tools/Instrument | Size | Qty | SR.NO. | Materials/Machinery | Size | Qty |
|---|---|---|---|---|---|---|---|
| 1 | Combination plier | 200mm | 01 | 1. | Lead wire | 1.55 sqm | as requird |
| 2 | Electrician screw driver | 75mm | 1 | 2 | Switch (S.P) | 250 / 0A | 01 |
| 3 | Side cutting plier | 150mm | 01 | ||||
| 4 | Electrician knife | 75mm | 01 | ||||
| 5 | Screw driver | 150mm | 01 | ||||
| 6 | Ceiling fan | 01 | |||||
| 7 | Fan regulator | 01 |
1). Draw the connection diagram.
2).Not the name plate detail of the given ceiling fan motor.
3).Identify the terminal of the ceiling fan motor.
4). select the suitable range of regulator.
5).Connect the fan regulator in series with the fan regulator.
6).Switch ON the main supply.
7).Control the speed of the fan regulator by the rotary switch knob rotate of the regulator.
PRECAUTIONS.
1).Do not connect the regulator in parallel with the supply.
2).Increase the speed of the fan motor cut of the internal resistance step by step rotate the rotary switch
of the regulator.
Aim:4:- Measure of the resistance by using post office box.
Requirement
| SR.NO. | Tools/Instrument | Size | Qty | SR.NO. | Materials/Machinery | Size | Qty |
|---|---|---|---|---|---|---|---|
| 1 | Nose plier | 150mm | 01 | 1. | Deferent type of restance | one each | |
| 2 | Connector screw driver | 75mm | 1 | ||||
| 3 | Electrician knife | 75mm | 01 | ||||
| 4 | Post office box | 01 | |||||
| 5 | Galvanometer | 2 | P.V.C wire | 1.55sq | 3m | ||
| 6 | Battery | 06v | 01 | 3 | Battery lead | as requird | |
| 7 | Insulated combination plier | 200mm | 01 |
PROCEDURE >
1).Connect the battery galvanometer and unknown resistance at the marked terminals as per diagram.
2).Adjust two 10 ohm and 1 ohm i each of the ratio arms P and Q.
3).Adjust 1 ohm in variable (arm)R.
4).press the push button and sec the deflection of the galvanometer.
NOTE} press battery switch first and then the galvanometer switch.
5).Adjust the max resistance in R and repeat the operation.
NOTE} the deflection of the meter must be on the other side other wise very the resistance in ratio arm
P and Q.
6). very the resistance R until the galvanometer null point.
