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 (3120)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3300)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13434)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2385)
 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 (2398)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (107)
 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 (79)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1203)
Question
what is the VVVFD and?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
vvvfd means varieable voltage variable freqwency drive. 
Is This Answer Correct ?    6 Yes 0 No
Vijay
 
Answer
# 2
The electric drive which uses variable voltage and variable
frequency for its operation and control is called VVVF
drives.With the technology improvement in the realm of
power electronics now it is more easy to work with VVVF.
Cycloconverters are employed to obtain variable frequency
up to 400Hz.

VVVF find applications in railways traction,airplane etc.

Author:arbelectbit@yahoo.com
 
Is This Answer Correct ?    5 Yes 0 No
Iamdon
 
 
 
Answer
# 3
generaly AC drive supplied with AC voltage , but where we
need variable source , there we use VVVFD(variable voltage
variable frequency drive).
raquirement for VVVFD.......
1.ac source
2.rectfier circuit.
3.filter circuit.
4.inverter circuit
5.IGBT
 
Is This Answer Correct ?    2 Yes 0 No
Shashi Bhushan
 
Answer
# 4
varible voltage and varible frquency drive 
Is This Answer Correct ?    1 Yes 0 No
Kaushal
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is meant by oil filled power & distrubution transformer ? if anybody know the link of detail about above transformers means plz send it i have interview on this week ? plz help me   3
why ligthing is not available in switch yards?   1
What is frequency? TCS 3
how capacitor control the power factor/ ABB 2
how to calculate the cable size in sqmm if load (kw) is given?   5
how many frequent start/stop operation possible in case of HT MOTORS. DVC 5
why battery is connected in parallel ?   7
What is meant by IP55 motor.Where it is used? Zuari 1
why in some cases the receiving end voltage is higher than the sending end voltage in transmission line (called 'Ferranti effect') ????? whts the reason behind tht???   3
When a fourth resistor is connected in series with three resistors, the total resistance   1
how do we connect mcb in our home?and how does it work? IOCL 3
why the genearation of electricity always in form of sine wave only ??? why not cosine wave ???   1
 
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