ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electrical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3077)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3289)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13333)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2363)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (416)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2381)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (106)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (44)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (77)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1196)
Question
What is IGBT?Where it is used? What is the difference 
between IGBT and Thyristor?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Insulated gate bipolar transister. it is a combination of
BJT and MOSFET.

BJT has low conduction loss and having longer switching
period.
MOSFET has high conduction loss and having lower switching
period.
therfore IGBT has low conduction loss and high switching
period.

it is used in SMPS, traction motor, Induction heating etc.

In SCR once the gate is triggered the gate is lossed its
control. ie if we remove the gate pulse after the SCR
starts conducting it will not stop.

but in IGBT we can control the Gate. by applying reverse
voltage.

i think this is the difference if any one find the above
answer is wrong please tell me the right one.
 
Is This Answer Correct ?    174 Yes 32 No
Priyadharsini
 
Answer
# 2
the full form of igbt is insulated gate bipolar transistor.
it is constructed from the combining of both BJT and PMOSFET.
it has high input impedance and low on - state power loss .
it is free from second break down problem present in bjt...
it is also known as (MOSIGT), (COMFET)...

it is constructed virtualy in the same manner as a power
MOSFET.an IGBT has also thousand of basic structure cells
connected appropritely on a single chip of silicon.

it has a four substrate p,p+,n+,n-. respectively...
p+ substrate is called injection layer because it injects
holes into n- layer .n- layer is called drift region .
thickness of the n- layer determines the voltage blocking
capability of IGBT.
the p layer is called body of the IGBT.

WHERE IT IS USED : it is widely used in medium power
application such as DC and AC motors drives.
UPS SYSTEMS , RELAYS AND CONTACTORS.


In thyristor the gate is triggered the gate is losses its
control. ie if we remove the gate pulse after the thyristor
starts conducting it will not stop.

but in IGBT we can control the Gate. by applying reverse
voltage applied across it .
 
Is This Answer Correct ?    92 Yes 13 No
Anand
 
 
 
Answer
# 3
Apart from the above mentioned i add to that

The Thyristors can not be switched beyond 1kHz where as
IGBTs can be switched upto 25kHz and even to 100KHz with
few soft switching techniques.

The thyristor can carry very high currents order of 3000A
but IGBT carries less current max of 1000A.

Thyristor commutation ,that is switching off is very
difficult. But there are applications of thyridtor with
natural commutation.

The IGBT can be switched on and off like a MOSFET. ie it is
voltage controlled device.
 
Is This Answer Correct ?    63 Yes 8 No
V N Panchalai
 
Answer
# 4
would the IGBT rectifier suitable for electro plating
application at max 2000A / 12 V above the SCR type.
 
Is This Answer Correct ?    16 Yes 4 No
Parat
 
Answer
# 5
IGBT are widely used in medium power application such DC and
AC motor drive. IGBT is more expensive. The IGBT Of 1200 v,
500A rating 0.25 to 20 micro second turn off time with
operation frequency upto 50Khz are available.
 
Is This Answer Correct ?    0 Yes 0 No
Shishant Anand
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
Does the motor power displayed on the Motor name plate is the mechnical power motor delivers or it is consumed power from the system?   1
what is meant by form factor and hoe related with the HT transmission voltage   2
tell me working of air circuit braker.   2
how to calculate H.P of a moter from speed of a moter?   5
Why the capcitor to be discharged after put in to operation & why not inductor though the both elements stores energy?   2
What is difference between slip rings and carbon burushes? IVRCL 2
fundamentals of transformers. Adani 4
Am i eligible to get electrical supervisor licence? As i did diploma as well as degree in Electrical Engg. in June 2011. Now i am working in 15 MW Power plant from 2 mnths. i belongs to Maharashtra.   1
why two contacts(in series) are using in closing circuit   3
In alternator generally we give DC voltage to field of alternator but field (excitor)produce Ac & converts into DC by rotating rectifier(RR ) then fed to rotor .my question is why we cannot give dc voltage directly to rotor instead of Excitor & RR ?   1
why we are using large cross section cable at load side and small at other (11kv to trsfr)side of transformer? when the load increses current at both side increases,right?   2
why we not using 230kv directly why we are stepping down and then stepping up Siemens 2
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com