what is back emf?

Answers were Sorted based on User's Feedback



what is back emf?..

Answer / sumit

since the induced emf in the dc motor oppose the votage
applied to the armature of a dc motor. so it is called the
back emf

Is This Answer Correct ?    7 Yes 0 No

what is back emf?..

Answer / vishnu gandhi

All windings have self inductance and mutual inductance. So
Lx dI/dt effect produces oppose to current which can be
termed as back emf. In case of Induction Motor the rotor
is short cicuited secondary of transformer which produces
it's own magnetic field and back emf is iduced in primary
winding which depend upon speed of rotor and
current.

Is This Answer Correct ?    3 Yes 1 No

what is back emf?..

Answer / dhaval busa

we take dc motor,when we apply voltage in dc motor the current is flow.the armature carrying conductor take current and cut the main field. according to faraday's law rate of change of flux,emf is induced but oppose the emf according to lenz's law.this emf called back emf

Is This Answer Correct ?    0 Yes 0 No

what is back emf?..

Answer / sathish

An EMF which comes backwards is called bach emf

Is This Answer Correct ?    0 Yes 9 No

Post New Answer

More Electrical Engineering Interview Questions

why in three phase 440 circuit in all phase current is almost equal L1-35 A,L2-34 A ,L3-31 A but in nutral when i check with clamp meter it shows 25 A?

4 Answers   OPS,


In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?

0 Answers  


what is diffrence between neutral and earth wire

23 Answers   Bhel, Esab, MTNL,


how tto ingress mw in turbine explain.procedure ?

0 Answers   Power Grid,


whatis the commertial spec. of distribution boards ?

0 Answers   Bosch,






IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?

2 Answers  


what is starting current and use of starting current?

3 Answers  


how power can be saved using VFDs in detail explain

1 Answers  


WHY IN THREE PHASE CABLE 440V CURRENT FLOWS IF IN ONE PHASE 230V CURRENT FLOWS ???

3 Answers  


I am getting differential earth fault in my transformer realy , i have checked all its CT & control wiring but do not get fault, Please help

6 Answers  


Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

0 Answers   Bhel,


What is the meaning of 'A synchronous motor floating on line'?

2 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5084)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16631)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1094)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)