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 (3076)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3289)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13331)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2363)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (416)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2380)
 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 (43)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (77)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1196)
Question
how we calculate the 30 KW 3phase electric motor current on 
noload
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
30 KW MOTOR NOMALLY FULL LOAD 54 AMPS, BUT WITH OUT LOAD
30% CURRENT WILL TAKE,ANY THREE PHASE INDUCTION MOTOR WITH
OUT LOAD 30PERSENT CURRENT WILL TAKE.
 
Is This Answer Correct ?    145 Yes 35 No
J.kesavan
 
Answer
# 2
No load current of a 3phase induction motor varies
according to its KW and rpm. Normally as a thumb rule
fraction HP motors (below 2.2KW) will be 50% of full load
current. Above 2.2KW may be 20% to 30% OF full load
current.
 
Is This Answer Correct ?    57 Yes 16 No
D.g.skandan
 
 
 
Answer
# 3
no standerd farmulla to calculate the noload current but as
a thumbrule 3 ph induction motor will draw 30% current on
no load but few motor will take 50 to 60 % current
 
Is This Answer Correct ?    44 Yes 9 No
Suresh
 
Answer
# 4
Actually,there is no standard formula to calculate the
noload current of the motor.Normally 25% to 40% of full
load current of the motor.Also depending upon motor KW and
supplier..
 
Is This Answer Correct ?    37 Yes 4 No
Suthan Prabhu
 
Answer
# 5
In=p/1.732*v*p.f

=30x1000/1.732*.8*380

=57A

Ino=57/3
19A
 
Is This Answer Correct ?    50 Yes 28 No
Mahmoud
 
Answer
# 6
I agree with suthan prabu. there is no formula to calculate.
depends on the manufacturers design, but full load curret can be calculated.
 
Is This Answer Correct ?    16 Yes 9 No
Pillay
 
Answer
# 7
practically the no load current of 3 phase motor varies
from 25% to 35% whereas in 1phase it is nera to full laod.
 
Is This Answer Correct ?    20 Yes 14 No
Surajkant
 
Answer
# 8
There is no standerd formula for calculating no load
current, It depend on the desine and material used in
motor. There is a major role of material(winding wire&
stamoing)to anhancing the efficiancy of motor.
 
Is This Answer Correct ?    5 Yes 1 No
S.p.singh
 
Answer
# 9
3 ph induction motor will run 30% current on
no load but few motor will take 40% current


EXAMPLE:

KW=3.7KW,Amps=7.45,(Assume 40% Of No Load Amps)

No Load Amps = 7.45*0.4
= 2.98A
 
Is This Answer Correct ?    4 Yes 0 No
K.arivazhagan
 
Answer
# 10
12A 
Is This Answer Correct ?    0 Yes 0 No
Maheshwar Das
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
SAY CORRECT DEFINITION... WHAT IS EDDY CURRENT LOSS? WHAT IS HYSTERESIS LOSS?   4
In winding design, the angle of chording (β) is nearly equal to A 45 degree B 60 degree C 30 degree D 90 degree Reliance 1
how many units (kwh) are there if in one MW?   5
over frequency is the protection of turbine or alternator?   2
what is the minimum distance between substation wall and LT panel outer surface? L&T 3
What is the basic difference between 90% stator earth fault and 100% stator earth fault, and its phenmenona? Reliance 4
why transformer capacity is called KVA and motor capacity is called HP/KW? Why transformer capacity cant call HP/KVA?   5
what is starting current and use of starting current?   3
What the methode get earth resistance?   2
what is advantage of providing taping on HT side?   3
Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian   1
What are the different pre-commissioning tests that are performed on the distribution transformer, power cable and switchgear (11kv)? Reliance 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