## Posts

Showing posts from January, 2019

### Electrical Machine Design (equations)

FactorsDC Machine Transformers Induction Machines Synchronous MachinesOutput EquationPa=CoD2Ln, where Pa=P/h for generators, Pa=P for motorsFor Single Phase
Q=2.22 f Bm Ai Kw Aw d10-3
For Three Phase
Q=3.33 f Bm Ai Kw Aw d 10-3Q=CoD2 L ns
KVA Input Q=
HP * 0.746 / Cos f * hQ=CoD2 L ns
KVA Input Q=
HP * 0.746 / Cos f * h
For Turbo alternators
Q=1.11Bavac KwsVa2 L 10-3/nsOutput CoefficientCo=Bav ac* 10-3where Bav-magnetic loading and ac - electric loadingDNACo=11 Kws Bav ac 10-3Co=11 Kws Bav ac 10-3 Choice of Magnetic LoadingFlux Density in Teeth Frequency of Flux Reversals Size of machineDNAMagnetizing current, Flux Density, Iron lossIron loss, Stability, Voltage Rating, Parallel Operation, Transient ShortCircuit current Choice of Electric LoadingTemperature rise,
speed of machine, Voltage, Armature reaction, CommutationDNAOverload Capacity, Copper losses, Temperature rise, Leakage ReactanceCopper loss, Synchronous reactance, Temperature rise, Stray Load losses,
Voltage rating Flux …

### Technology Tools for Teachers and Educators

The Mediocre teacher tells,
The good teacher explains,
The superior teacher demonstrates,
the great teacher inspires......

William Arthur Ward
If you are a teacher or a professor, you cannot survive with out technology and impress or inspire students of this generation. If you want to become a great teacher, here are some tools that you can use for your teaching and learning. The tools are characterised based on the categories. One or more of the tools can be used within or outside the classroom.
Presentation Tools
MS Office (Power Point, Word and Excel)Libre Office (Its Free and open source)WPS Office (Its free, have support of all the MS Office files)Prezi (Its a tool for infographics and animations within presentation)MS Sway (This is from Microsoft and its a graphic content generation that can make the students learn the subject in a greater depthKeynote (for Apple machines). Others also can use through www.icloud.com to generate presentation using keynote.

Social Media

### How to Access MOODLE in Intranet and Internet

When Moodle is accessed either in Intranet or internet, there will not be any issue. But occasions when the MOODLE Site has to be accessed both in the intranet and in the Internet, here is a simple trick
Operating system: Windows Server 2008
Moodle Version: 2.4
WAMP Server is used.
Number of Users: 3000 (Students) + 200 (Faculty)
Open the config.php from ~/moodle/config.php
include these lines
\$CFG->wwwroot = 'http://'.\$server_id.'/vitcc';
\$CFG->dataroot  = 'C:\\wamp\\moodledata';
before the following line
\$CFG->directorypermissions = 07xx;
Restart the WAMP Server and you can Check MOODLE Site both in Internet and Intranet.

The above Image tells the intranet Link and the internet link can be opened outside the campus network

### Virtual Host in Bitnami Lampstack

IF you have a website that runs with an IP address and you decide to move it to a domain, then here is the clear step.  Also this post will be helpful to you if you are running a same website by two different IP Address (One in campus and another outside the campus)
Prerequisites:

You want to move it to: example.com (instead of example.com/site)

Step 1:
Open the file /opt/lampstack-5.5.31-0/apache/conf/bitnami/bitnami.conf
In the above file, Change these lines  (The bold lines are the changed ones)

<VirtualHost _default_:80>
DocumentRoot “/opt/lampstack-5.5.31-0/apache2/htdocs/site”
<Directory “/opt/lampstack-5.5.31-0/apache2/htdocs”>