Tuesday, 31 July 2012
Monday, 30 July 2012
THE HINDU- EDUCATION PLUS,
Engineering education or only degree?
THE HINDU- EDUCATION PLUS
U.K. student visa: new rules introduced
THE HINDU- EDUCATION PLUS
Students develop prototype to help ryots
http://www.thehindu.com/todays-paper/tp-features/tp-educationplus/article3700985.ece
THE HINDU- EDUCATION PLUS
Vizag teams off to IIT tech fest
Qualify preliminary round for ‘Escalade’, an all-India robotic competition for engineering
http://www.thehindu.com/todays-paper/tp-features/tp-educationplus/article3700979.ece
Sunday, 29 July 2012
You Are With Us....If You Do So
ATTENTION...
Hi...Bloggers
Want to Post Interesting Topics In This PRABALYA .....
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Just Send a Mail To: prabalya.eee@gmail.com
interesting study material links.....
http://physics-animations.com/
http://mathworld.wolfram.com/
http://www.furryelephant.com/
http://www.tutorvista.com/content/science/science-ii/electricity/multiple-choice.php
http://science.howstuffworks.com/
http://www.mathworks.in/
http://www.acsu.buffalo.edu/~wie/applet/applet.old
http://www.falstad.com/mathphysics.html
www.filehippo.com/
http://www.presentationpro.com/
http://www.otherpower.com/otherpower_systems.html
http://www.crazyengineers.com/
http://www.indiamart.com/siouxpower/power-system-study.html
http://www.indiamart.com/siouxpower/power-system-study.html
http://www.ehow.com/info_8781032_iterative-methods-linear-nonlinear-equations.html
http://mathworld.wolfram.com/
http://www.furryelephant.com/
http://www.tutorvista.com/content/science/science-ii/electricity/multiple-choice.php
http://science.howstuffworks.com/
http://www.mathworks.in/
http://www.acsu.buffalo.edu/~wie/applet/applet.old
http://www.falstad.com/mathphysics.html
www.filehippo.com/
http://www.presentationpro.com/
http://www.otherpower.com/otherpower_systems.html
http://www.crazyengineers.com/
http://www.indiamart.com/siouxpower/power-system-study.html
http://www.indiamart.com/siouxpower/power-system-study.html
http://www.ehow.com/info_8781032_iterative-methods-linear-nonlinear-equations.html
electric circuit
here is a document that covers all the topics of electrical circuits.
click on the below link to download it
Electronic circuits
download this pdf for electrical circuits notes.
Saturday, 28 July 2012
III EEE project updates-(change of project title by batch 3)
Blow-fuse
indicator
|
Under normal conditions (when fuse is alright), voltage drop in first arm is 2V + (2 x 0.7V) = 3.4V, whereas in second arm it is only 2V. So current flows through the second arm, i.e. through the green LED, causing it to glow; whereas the red LED remains off.
Fig.1 Blow- fuse indicator
When the fuse blows off, the supply to green LED gets blocked, and because only one LED is in the circuit, the red LED glows. In case of power failure, both LEDs remain ‘off’.
This circuit can be easily modified to produce a siren in fuse-blown condition (see Fig. 2). An opto coupler is used to trigger the siren. When the fuse blows, red LED glows. Simultaneously it switches ‘on’ the siren.
Fig.2 Blow- fuse indicator with alarm
In place of a bicolour LED, two LEDs of red and green colour can be used. Similarly, only one diode in place of D1 and D2 may be used. Two diodes are used to increase the voltage drop, since the two LEDs may produce different voltage drops.
Components for alarm circuit:
1. Diode 1-
IN4007
2. Piezo buzzer
3. IC MCT2E
4. Red, Green LEDS
5. Diode 2- IN4007
6. Resistor 100K
7. Bulb 25w
8. 12V DC
power electronic concept
POWER ELECTRONICS IN
SHIP PROPULSION ELECTRIC MOTORS.doc (Size: 732 KB / Downloads: 10)
INTRODUCTION :
The predominant type of prime movers for DP propulsion plant is Electric Drive .Practically every DP propulsion device installed in newly constructed vessels as well as in most of the conversions is driven by an electric motor. In recent years, variable speed AC Drives has become available and has been used in some applications for DP propulsion. The most commonly used motor drives are:
DC converters, or SCR for DC motors.
Cyclo converters for AC motors ,normally for Synchronous motors .
Current Source Inverters (CSI) for Ac motors (Synchronous Motors )
Voltage Source Inverters ,(VSI)for AC motors ,i.e. asynchronous ,synchronous and permanent magnet synchronous motors.
SCR CONTROLLED DC DRIVE AND FIXED PITCH PROPELLER
Ac controlled produced by Diesel generators at constant voltage (600 VDC max) and frequency.
A fixed pitch propeller is driven by the DC propulsion motors .Varying the propeller RPM and reversing the rotation of the propeller shaft allow the thrust to be controlled in magnitude and direction.
DISADVANTAGES:
The limitation of voltage (max voltages are 600V AC/750V DC) =>leads to heavy, expensive motors , cables runs .
Commutator wear =>higher maintenance requirements of the DC motors.
Practical limit for DC motor drives is 2-3 MW.
The power factor will vary from 0-0.92(α =15 degrees) – correspondent to 0-100% propeller rpm.
APPLICATIONS:
Introduction of the high current SCR in the late 1960s, the AC/DC electric propulsion drive has become quite popular.
Vessels with this type of propulsion include fishing trawlers and factory vessels, research vessels, ice breakers, off shore supply vessels, conventionally moored and dynamically positioned drill vessels, and semisubmersibles .
INTRODUCTION :
The predominant type of prime movers for DP propulsion plant is Electric Drive .Practically every DP propulsion device installed in newly constructed vessels as well as in most of the conversions is driven by an electric motor. In recent years, variable speed AC Drives has become available and has been used in some applications for DP propulsion. The most commonly used motor drives are:
DC converters, or SCR for DC motors.
Cyclo converters for AC motors ,normally for Synchronous motors .
Current Source Inverters (CSI) for Ac motors (Synchronous Motors )
Voltage Source Inverters ,(VSI)for AC motors ,i.e. asynchronous ,synchronous and permanent magnet synchronous motors.
SCR CONTROLLED DC DRIVE AND FIXED PITCH PROPELLER
Ac controlled produced by Diesel generators at constant voltage (600 VDC max) and frequency.
A fixed pitch propeller is driven by the DC propulsion motors .Varying the propeller RPM and reversing the rotation of the propeller shaft allow the thrust to be controlled in magnitude and direction.
DISADVANTAGES:
The limitation of voltage (max voltages are 600V AC/750V DC) =>leads to heavy, expensive motors , cables runs .
Commutator wear =>higher maintenance requirements of the DC motors.
Practical limit for DC motor drives is 2-3 MW.
The power factor will vary from 0-0.92(α =15 degrees) – correspondent to 0-100% propeller rpm.
APPLICATIONS:
Introduction of the high current SCR in the late 1960s, the AC/DC electric propulsion drive has become quite popular.
Vessels with this type of propulsion include fishing trawlers and factory vessels, research vessels, ice breakers, off shore supply vessels, conventionally moored and dynamically positioned drill vessels, and semisubmersibles .
Reference: http://seminarprojects.com/Thread-power-electronics-in-ship-propulsion-electric-motors#ixzz1nPUtH3HQ
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