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

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.

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

Answer / sathish

An EMF which comes backwards is called bach emf

Why there is not any reactive power in DC although it causes magnetic field.

7 Answers  

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To avoid arcing what we connect in earthing.

4 Answers   HAL,

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How to calculate MCB Breaking capacity.

0 Answers  

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what is IP55,IP65

2 Answers  

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How to model "to find the cube root of the given number" in Matlab Simulink ?

1 Answers  

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why we measure output of transformer in kva?

1 Answers  

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I am EEE student i want to improve my core side skills.how cn i approach it?

0 Answers   Suzlon,

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Hi,, Just I want ask, if the power factor decrease what happen in voltage regulation? Thanks..

1 Answers  

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What are the technical reasons for soaking transformers for various times before allowing them to pick load after a fault ?

4 Answers   GE,

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3 Answers  

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Why the colour of insulator is always is chocolate in colour?

1 Answers   MRF,

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