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 (3009)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3270)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13219)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2348)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (407)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (76)
 Bio Engineering interview questions  Bio Engineering Interview Questions (16)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (162)
 Instrumentation interview questions  Instrumentation Interview Questions (2316)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (104)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (43)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (73)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1189)
Question
why do we use UPF watt meter in short circuit test of the 
transformer and LPF watt meter in open circuit test of the 
transformer
 Question Submitted By :: Swathi
I also faced this Question!!     Rank Answer Posted By  
 
  Re: why do we use UPF watt meter in short circuit test of the transformer and LPF watt meter in open circuit test of the transformer
Answer
# 1
In full load test, rated current
is made to flow and hence the
fraction of magnetising current
is less compared to the watt
component.. Hence power factor
would be nearly unity.. So UPF
wattmeter is used..
But whereas in no load test,
since the machine is not loaded,
watt component of current would
be negligible as compared to
magnetising component.. Hence
the power factor would be very
low.. So LPF wattmeter is
used..!!
 
Is This Answer Correct ?    60 Yes 7 No
Pradeepkumar
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is the role of energy meter in distribution system ???? technical and non technical losses in distribution system????   1
which motor is used in high mast ( street light) & give the hight of tower . Construction 1
I have 11KV/415V power distribution transformer. I have found unbalance current in LT (415V) side. Also observed that unbalance voltage (3V) at LV side due to HV side unbalance voltage. What should I check for this? Also, the same LV side load can run in balance on captive power.   1
how to calculate short circuit calculation of the transformer by usuing the percentage impedence? formula needed. L&T 2
how can we calculate the current   2
Which machine u will prefer to use at where flameble gases are comming out & why? NTPC 1
what is the Space heater? why using in Electrical motor?   2
How to select cable rating for HT/LT Panels Alstom 1
what is the purpose of NGR?   24
What is the full form of AND,OR and other logic gates   7
what is the meaning of trippe time of circuit breaker   1
Why we does earthing for transformer neutral point DLF 5
 
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