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A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.
Function
Transistors amplify current, for example they can be used to amplify the small output current from a logic IC so that it can operate a lamp, relay or other high current device. In many circuits a resistor is used to convert the changing current to a changing voltage, so the transistor is being used to amplify voltage.
A transistor may be used as a switch (either fully on with maximum current, or fully off with no current) and as an amplifier (always partly on).
The amount of current amplification is called the current gain, symbol hFE.

Hi,
CAD course help the engineers to have knowledge in Computer aided designs and teach them about the various designing and drafting tools with the help of software.
1)
Yes, there are CAD courses and the eligibility criteria depends on the institutes.
** For Diploma courses, it is usually a Diploma/ Degree in Mechanical/ Production/ Automobile/ Plastic / Electrical Engineering.
** For CAD programs based on AutoCAD, the eligibility is ITI-D/Man or Diploma/Degree in Mechanical/ Civil/ Architecture/ Interior Design.
** Candidates with plus two also have an option for studying Engineering Drawing with CAD.
** To become an expert CAD professional, you should possess graduation in engineering. Some reputed institutes, teach CAD software as part of their curriculum along with their 4 years bachelors degree course.
There are several reputed institutes which provide CAD courses. You may contact the institute personally and choose the course according to your interest, requirement and time availability but make sure that the institute is recognized.
2)
Job Prospects :
After CAD you may work in the field as :
-Drafters
-Design Technician
-Engineering Aids
You can even work as :
-Bench Animator
-Motion Capture Animator
-Shadier
-Game Design Animator
-Special Effects Artist
-Teaching is another option, as the number of CAD / CAM training institutes are coming up. And with experience, you can start up with your own firm or can work as an independent freelance CAD designer.
Please feel free to discuss more. Click on the thumbs up or mark it as the best, if you found this useful.
Wish You Luck!

Hello A. Venkatesh, I’m sorry as you cannot get admission in any University or College without appearing for IELTS or TOEFL let alone be any course you choose. Being a student of a Country where English is a Secondary Language it is a mandatory for you appear for your IELTS or TOEFL for admissions.
But, firstly as I do not have much knowledge about your academic qualification I suggest you kindly Email us all the Scanned Copies of your Academic History and on the basis of which we can guide you for the course best suited for you. For more detailed guidance contact us through the ecard available on Shiksha site or check our website www.educationworld.co.in. We represent more than 300 Universities/colleges across the world.
Feel free to raise more questions.
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All the Best!!!

Hi,
Find below some of the institutes in Kolkata offering MBA:
- Annex College of Management Studies.
- Unitedworld School of Business.
- Accord School of Business.
- Army Institute of Management.
- Bengal Institute of Business Studies.
As per your query regarding placements I would suggest you to contact the admission department of these institutes, and request them to give you details regarding past placements records, average salary offered and highest salary offered to students.
You may also browse through the placement section of these institute's website to get detailed information regarding placements.
If possible, you may personally visit these institutes, and talk to the students studying there, and take there feedback regarding faculty, teaching methodology, placements etc, all this will help you to take decision regarding which institute to join.
All the Best.