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 (3112)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3298)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13412)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2382)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (420)
 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 (165)
 Instrumentation interview questions  Instrumentation Interview Questions (2392)
 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 (45)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (78)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1202)
Question
What makes the difference between 50Hz supply and 60Hz 
supply which one is economical? What is the use of using 
increased frequency?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
if frequency is increases current decreases(due to inversly
proposational) current deceases area of conductor size is
decreases(directly propsational) size decreases then power
loss consuption will be reduced..
 
Is This Answer Correct ?    3 Yes 0 No
Srikanth
 
Answer
# 2
When we increase the level of frequency, level of power
losses will automatically reduce.As we are aware of
transformer emf equation, E=4.44fNAB.
f=frequency,A=area of cross-section,B=magnetic flux density
when we increase the frequency, by having E&B as
constant,area of cross-section will reduce.So,the size of
transformer can be reduced with higher frequency
 
Is This Answer Correct ?    1 Yes 0 No
Chandru
 
 
 
Answer
# 3
frequency is inversely propotional to the reactance,so if
the frequency increases,reactance decreases thereby current
gets increased.so if the resistance is constant,voltage
increases so that the windings cant be able to withstand
the increased voltage and also if the current increases
I^2R losses will increase.
 
Is This Answer Correct ?    4 Yes 6 No
C_elavarasi@yahoo.com
 
Answer
# 4
50 HZ is uswed in india and also majority in other world.
some of countries uses 60 HZ as UK . The frequency is
inversly proportional to current ,so when drops current
increases or vise versa.the change of frequency is uses in
VFD to change speed .
 
Is This Answer Correct ?    0 Yes 4 No
Anil
 
Answer
# 5
if frequency increases power losses decreases
viceversa.50hz econ0mical
 
Is This Answer Correct ?    7 Yes 15 No
Ekanadam Patlavath
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is mean by lookup table in microprosser.   1
what is reactive and active power?why we need power factor correction?   2
what is formula in determining the size of Circuit Breaker for transformer with the following specifications. 7 units of 1600 volts (primary) and 400 volts (secondary). Both Primary and Secondary will have a circuit breaker which is SF6. What should be the Switchgear Main Breaker Size anf the sizes of each brances Circuit Breaker for Primary. ABB 1
how does a current carrying conductor posess a magnetic field. what is the reason for the production of electro magnetic field around the conductor Vizag-Steel 2
how to select the surge suppresor for the 33 KV supply and what will be the rating, selection guide   1
how to select the rating of neutral ct with reference to transformer secondary current(in power transformer,stepdown tansformer,for example2000kva,11kv/415volt ASD-Lab 2
what is the difference between RMS meter and normal meter TATA 2
In the case of petrochemical area AC drive & AC motor is used where the speed variation is required. Why they are not Using DC drive & DC motors in such areas?   1
what are the different pre- commissioning tests performed on distribution transformer, power cable and switchgear????? Reliance 1
what maximum load will take a aluminum cable of 50mm 4 core.   2
How can i check a relay good or not?   2
how can I improve the current at same voltage? if yes is there any circuits?   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