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 (3114)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3298)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13420)
 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 (2393)
 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 (78)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1202)
Question
Explain principle of Soft-starter & how its working???
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Mainly Induction Motor takes 5-6 times of FLC while starting
in DOL mode.So soft starter is used to start the motor for
reducing starting current and smooth starting.Softstarter
which gives the voltage from 30% to 100% percentage of
voltage by certain time(Its in seconds) to the motor.By
means of thyristor softstarter is controlling the
voltage.After 100% voltage reached,the inbuilt DOL bypass
contactor is come into picture.
Advantages of softstarter:Motor life be good,Mechanical
equip life be good.
Disadvantage:It is mainly not applicable for heavy starting
load,Harmonics
 
Is This Answer Correct ?    24 Yes 2 No
Boopathiraj.s
 
Answer
# 2
Softstarter is used for good starting tourch with lesser
starting current
 
Is This Answer Correct ?    23 Yes 4 No
Prashant
 
 
 
Answer
# 3
Soft starter is a device which controls satarting Current
of the motor. it start the motor from 0 to 100% slowly.
meanwhile it save the electrical power and reduce the loses
and starting tarque.
 
Is This Answer Correct ?    21 Yes 4 No
Muhammad Ashraf
 
Answer
# 4
in this starter we using mainly 2 contrctor. 
Is This Answer Correct ?    35 Yes 20 No
Vipupk
 
Answer
# 5
soft starter also use to prevent the motor heats up & loss
of wear & tear of friction losses.
Also soft starter use to prevent the loss of power.
 
Is This Answer Correct ?    19 Yes 12 No
Sushilkumar
 
Answer
# 6
In soft staretr current is gradually increased which is
save the power loss & also the motor friction in
unnecessarily used.
 
Is This Answer Correct ?    21 Yes 15 No
Sushil
 
Answer
# 7
Soft starter is a device which controls satarting Current
of the motor. it start the motor from 0 to 100% slowly.
meanwhile it save the electrical power and reduce the loses
and starting tarque.
 
Is This Answer Correct ?    8 Yes 2 No
M.a.bhatti
 
Answer
# 8
for starting a rated motor with a DOL starter which draws 5-
6 times of load current initially which causes voltage
drops in line while a soft starter takes comparatively less
current and gradually decrease to the rated current.
but the main draw back of soft starter is its torque
remains low at the starting.
 
Is This Answer Correct ?    2 Yes 0 No
Esveekayzee
 
Answer
# 9
motor life time is increased
reduces mechanical stress on motor
power is saved
 
Is This Answer Correct ?    5 Yes 8 No
Asif Khan
 
Answer
# 10
soft stater working in 2 contectter in use by stating
current in soft stater load in full rpm in dol contecter
 
Is This Answer Correct ?    15 Yes 25 No
Vipul
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
What is the correct procedure to shutdown VCB in 11kv substation.safety and work procedure   2
A system having the charactristic eqation (s+1)(s+2)(s-3)=0 is (a)stable (b)unstable (c)marginally stable (d)critically stale   1
What is the LUX   2
I have been short listed for sydicate clerkcal post .i have interview on 15th sept..i want to ask if i don't know kannada to read and write they won't allow me to attend the interview?Do send u r reply....... Syndicate-Bank 1
why do we connect droop ct{in gensets}in y_phase only   2
why compound generator is used in generating station?   2
Why alternators are rated in KVA?   11
How many types of isolator is available for H.T.lines? which one is best for sub-station?   4
what is the difference between isolator and circuit breaker   3
What is Horan Gap Fuse? Where it is used?   1
Ns=120f/p. what is 120? Ramada 8
In Star type and Delta type Motors, If one phase will miss/Break then which phase winding will burn and why?   4
 
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