A Test-bed for Performance Evaluation of Load Balancing Strategies for Web Server Systems

Many large web sites get more than 100 million hits everyday. They need a scalable web server system that can provide better performance to all the clients that may be in different geographical regions. Higher delays and losses are common on WAN links. To provide a better service to all the clients, it is natural to have fully replicated web server clusters in different geographical regions. In such an environment, one of the most important issue ....etc

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AIM :
To conduct a direct load test on a 3-phase slip ring induction motor and to draw the performance characteristics.
FUSE RATING-
FOR- STATOR- 125% 0f 7.5A = 10A
FOR ROTOR – 125% of 11A = 15A
THEORY:
Slip ring induction motor is also called as phase wound motor. The motor is wound for as many poles as the no. of stator poles and always wound 3-Ф even while the stator is wound two-phase. The other three windings are brought out and connected to three insulated slip-rings mounted on t ....etc

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AIM
To conduct the load test on single phase alternator.
APPARATUS REQUIRED
PRECAUTION
1. The motor field rheostat should be kept in the minimum resistance position.
2. The alternator field potential divider should be in the minimum voltage position.
3. Initially all switches are in open position.
PROCEDURE
1. Note down the name plate details of motor and alternator
2. Connections are given as per circuit diagram.
3. The DPST is closed on supply side.
4. Using three point starter, the moto ....etc

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AIM:
To determine the performance characteristic of a given single phase capacitor start induction motor by conducting load test.
FUSE RATING :
Fuse rating = 125% of rated current = 125/100 * 7.5
≈ 10A
THEORY:
The single phase induction motor is more or less a polyphase induction motor. The only
difference is that is given supply in single phase. This motor connect and motor function
w ....etc

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AIM:
To conduct the no load & blocked rotor test on 3- phase induction motor
& to draw the equivalent circuit of 3- phase squirrel cage induction motor.
FUSE RATING :-
125/100 * 7.5 A ≈ 10A
THEORY :-
A 3-phase induction motor consists of stator, rotor & other associated parts. In the stator
,a 3- phase winding (provided) are displaced in space by 120. A3- phase current is fed to the winding so that a resultant rotating magnetic flux is generated. The rotor starts rotat ....etc

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Aim
To conduct load test on three-phase squirrel cage induction motor.
Apparatus Required
Precaution
The motor should be started without any load.
Procedure
1) Connections are given as per the circuit diagram.
2) The TPSTS is closed and the motor is started using star-delta starter to run at rated speed.
3) At no load the speed, current, voltage and power are noted down.
4) By applying the load gradually with the help of spring balance and brake drum arrangements.
5) The speed, current, volta ....etc

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AIM:
To determine the performance characteristics of the given single phase induction motor by direct loading.
APPARATUS REQUIRED:
Precaution
The motor should be started without any load.
Procedure
1. Note down the name plate details of motor. Connections are given as per the circuit diagram.
2. The DPST is closed in the supply side.
3. The motor is started by gradually varying the autotransformer and the rated voltage is applied.
4. At no load, the speed, current, voltage and power are noted down.
5 ....etc

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AIM:
To draw the performance characteristics of 3-phase squirrel cage induction motor by conducting load test.
THEORY:
A 3-phase induction motor consists of stator and rotor with the other associated parts. In the stator, a 3-phase winding is provided. The windings of the three phase are displaced in space by 120º.A 3-phase current is fed to the 3-phase winding. These windings produce a resultant magnetic flux and it rotates in space like a solid magnetic poles being rotated magnetically.

....etc

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AIM:
To conduct the No Load test and Blocked rotor test on three phase squirrel cage induction motor and to draw the equivalent circuit.
FUSE RATING:
No load: 10% of rated current (Full load current)
Load: 125%of rated current (Full load current)
APPARATUS REQUIRED:
PRECAUTIONS:
The autotransformer should be kept at minimum voltage position.
PROCEDURE:
Note down the name plate details of motor.
1. For no-load open circuit test by adjusting autotransform ....etc

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AIM
To conduct load test on three-phase Slip Ring induction motor.
APPARATUS REQUIRED
PRECAUTION
The motor should be started without any load.
PROCEDURE
1. Connections are given as per the circuit diagram.
2. The TPST’S is closed and the motor is started using online starter to run at rated speed.
3. At no load the speed, current, voltage and power are noted down.
4. By applying the load gradually with the help of spring balance and brake drum arrangements.
5. The speed, current, voltage, po ....etc

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