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 (3157)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3309)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13490)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2396)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (424)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (166)
 Instrumentation interview questions  Instrumentation Interview Questions (2409)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (109)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (45)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (82)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1211)
Question
why crgo core is used in transformers?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
C.R.G.O (Cold-rolled grain-oriented sheet steel) is used for reducing the core losses in transformers.
Each type of steel has "grains" which consist of "domains". These "domains" are nothing but electrical charges oriented in any random direction.

Core loss= Hysteresis + Eddy Current Loss

Reduction of hysteresis loss:
(1)The size of the "grains" in a CRGO steel are purposely "grown" & made bigger & are about 10 times the size of the grains in regular steel.
(2)The grains in CRGO steels are all aligned almost parallel to the direction of rolling of the steel(i.e the length of the steel).

Reduction of eddy current loss:
A special carlite insulation coating on the steel being done so as to reduce the eddy current loss.
 
Is This Answer Correct ?    30 Yes 4 No
Guest
 
Answer
# 2
crgo is cold rolled grain oriented........steel used 4 tf is
cold rolled because it allows a much higher flux density of
around 1.8wb/m2 as compared to hot rolled steel...nd
therefore making it possible 2 minimize the core material nd
hence d core losses ..............
 
Is This Answer Correct ?    17 Yes 1 No
Divya Pundir
 
 
 
Answer
# 3
this material when magnetized in the rolling direction,has
low core loss and high permeability.
 
Is This Answer Correct ?    13 Yes 3 No
Manoj
 
Answer
# 4
Less of the loss 
Is This Answer Correct ?    13 Yes 7 No
Chetan
 
Answer
# 5
In order to improve the efficiency of the transformer along
with IR loss minimisation, Regards, V.G.Praveen
 
Is This Answer Correct ?    5 Yes 13 No
V.g.praveen
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
hi this toufik here. i am doing my b.e.degree.now i am in final year and supposed to do a project in this year so i thinking to control the buchholz relay using software base means checking the status of transformer oil using microcontroler, plc or scada. so can i do so...??? alz suggest me...   2
In tranformer winding Connection Like Dyn1 ,so LV lags Hv by 30 deg and Dyn11 LV lead HV by 30,so how do this lagging and leading afffect the transformer??   2
There is no such thing as a Generator. All power generating devices are Alternator since both generate alternating current since this is the only way electrical power can be generated. In "generators" the alternating current is converted into DC inside the housing of the "generator" in order to give out DC Do you agree? If not please educate me. How else is DC generated if not like above?   2
What is the Difference Between MCCB & ACB & VCB   3
1.what type of wave is produced from i.online ups ii.offline ups iii.inverter.why don't we use inverter instant of offline ups for computer,what's the reason?   2
why transmission line 11Kv OR 33KV,66Kv not in 10kv 20kv? NEPC 41
for a machine R=130 KVA Y=132 KVA B=144 KVA Then what will be the total kva ABB 1
What is cable gland,why does use for? Abb 3
what is skin effect and corona discharge ?   3
how the vaccum ckt breaker workes..? how the arc is quenching in it?   1
what is electrical?   14
How can we convert dc to equivalent ac??   4
 
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