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 (3011)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3270)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13223)
 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 (2317)
 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
What the capacitor Current formula?, For 1 KVAr how amps 
its required? for using the KVAr for boosting the PF Design 
Calculation.( Eg: for 30 KVAr required how many KW?)
 Question Submitted By :: Pasuvaraj
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 1
As per my knowledge,
On my site bellow capacitor bank I am using.
I have 350 Kvar capacitor bank in this bank 25 kvar
capacitors are placed.

Capacitor specification

Volt = 440
Kvar = 25
Three Phase

KVA
I = ----------
Volt *1.732

25000
I = ----------
440 *1.732

I = 32.80 Amps


Eg 30 Kvar

KVA
I = ----------
Volt *1.732


30000
I = ----------
440 *1.732


I = 39.36 Amps
 
Is This Answer Correct ?    213 Yes 87 No
Shri..
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 2
You explained the answer in KVA? where do get the kva from
this variables, the formula for capacitor in KVAr, KVAr
into KW, KVA & Amps
 
Is This Answer Correct ?    63 Yes 16 No
Pasuvaraj
 
 
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 3
For correcting PF KVAr is introduced, thus formula

pf=cos A is significant

there you should have a desired PF. If for example you need
a power factor of .90 to maintain for a 30kVAR the watts
that would come will be:

A=arccos .90
A= 25.84

WATTs= KVAR/tan 25.84

= 62500 watts approx.

remember that for PF correnction it is the KVAR that is in
need of computation and not the watts so the question would
rather be, how much capacitor kVAR you need to correct the
power factor.
 
Is This Answer Correct ?    31 Yes 18 No
Arnie
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 4
VOLT = 400
KVAr = 30
PHASE = 3

I = KVAr
-----
400 x 1.732
=43amps.
Kw = I x 0.624
= 26.8KW.
 
Is This Answer Correct ?    34 Yes 20 No
Jose
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 5
The question requires more details.
First the "K" represents kilo or 1000.
The real power (kW) can be thought of as the x-axis and the
reactive power (kVar) from inductance or capacitance can be
thought of as the y-axis. The hypotenuse is the
Apparent power (KVA). The relationship of Real to apparent
power gives the Power Factor, where a power factor of 1.0
simply means that you only have real power, no reactive
power. The leading and lagging VARs from capacitance and
inductance, respectively can be added numerically since
they are on the same axis.
To ask, how muck kVars are required for a given kW doesn’t
make a lot of sense because you need to include the desired
power factor.
 
Is This Answer Correct ?    18 Yes 5 No
Harry
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 6
Its 1.3A/KVAR 
Is This Answer Correct ?    23 Yes 10 No
Utkarsh
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 7
Kvar= 1.73*V*I*Sin$ ($ IS INSTESD OF PHASE ANGLE PHI)

so I= kVAR/1.73*V*SIN$

IN A PURELY CAPACITIVE CIRCUIT $ IS 90 DEGREE
SO TERM SIN 90 = 1
HENCE WE CAN CALCULATE CAPACITOR CURRENT BY kVAR/1.73*V
 
Is This Answer Correct ?    40 Yes 5 No
Prakesh
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 8
Ic=IsinQ1-I'sinQ2
where Q1 = phi1 and Q2 = phi
I is the curent, before correction and I' is the current,
after correction.
Ic is the subject of formula.
 
Is This Answer Correct ?    1 Yes 4 No
Botsar Joseph Antony
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 9
** Capacitor Current formula is

I= kVAr/kV/1.732 ( for 3 ph capacitor )

**for 1 kVar capacitor... suppose voltage is 440 volts than,

I=1/0.440/1.732
I=1.31 Amps.

For all your information,generally 1 kVAr capacitor takes
0.5 watts...henceforth..

30 kvar capacitor required kw=30X0.5=15 watts and is 0.015kw

thanks!!!!!!!
 
Is This Answer Correct ?    6 Yes 5 No
9561354591
 
  Re: What the capacitor Current formula?, For 1 KVAr how amps its required? for using the KVAr for boosting the PF Design Calculation.( Eg: for 30 KVAr required how many KW?)
Answer
# 10
normally Formula
Kvar= 1.732*V*I*Sin(pi)
If Pure Capacitor 90 Leads so The power factor is Unity(1)
Assume *V=415
*Sin(90)=1(But Reactive power is zero)
since I=Kvar/1.732*V*1 Eg. 1000/1.732*415*1=1.39A
other formula for Determine KW=KVAR/tan(pi)or KW=VIcos(PI)
Assume * cos(0.9)
since KW=KVAR/tan....Equ 1, take the cos invesr is equal to (0.9)=25.8419 ...Equ 2
KW=30KVAR/tan25.8419=61.94KW OR
they are more formulas
* KW=KVAR/tan(pi)
* Kw=KVA*cos(pi)
* Kw=SQroot(KVAZ^2-(KVAr)^2
 
Is This Answer Correct ?    2 Yes 3 No
Venkatesh O
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
why earth hole size is biggest in socket point.   3
What is the effect of leading power factor for power transformer & D.G? Exide 7
What is d diff. btw MCB & MCCB??? Emerson 1
In a Synchronous generator, Can AC voltage be used instead of DC voltage in field winding of rotor to produce AC power? NTPC 10
what is nuetral grounding   2
HOW THE AC GENARATOR CAN GENARATE REACTIVE POWER,HOW CAN WE CONTROL IT.AND OTHER SOURSES OF REACTIVE POWER GENARATIONS ARE WHAT.   3
what is the function of anti-pumping in circuit breaker? NCC 17
megger how much voltage will produce ?   4
what is mean by PID & Principal of working   6
why r use the wave taper in the substation ? L&T 2
I hv a question regarding power factor improvement just after transformer. I request you to reply me plzz. thank you sir. My friend has a small unit of fabrication. in his factory the main load is a welding machine, lathe machine, grinding machine. this load is not continuous type. now our electricity board has installed 16 KVA, 11000/433 V transformer for our factory. In the energy meter (trivector meter) at LV side of transformer, i hv seen power factor value of 0.15 only when only 3 KW load was flowing. Further electricity board has suggested to install 4 KVAR capacitor at LV side after energy meter. Now my question is that if we permanantly install and switch on 4 KVAR capacitor after energy meter, during some load on transformer and also without any load on transformer, wht will be the power factor shown in energy meter?i dont want to get any penalty by electricity board, so plz suggest me if i can permanantly install and switch on the 4 kvar capacitor or not at LV side of transformer just after energy meter? Thank you again and awaiting for ur positive reply soon.   8
what is specific gravity of a battery if specific gravity increase/decrease,what will happen to the voltage/current of the battery NTPC 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