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

is the power of a single phase induction motor(Fans) is constant under varying speeds?

4 Answers  

---

In constant power region of 3-phase IM torque-speed characteristics, if frequency increases slip A does not alter B decreases C increases D none of above

0 Answers  

---

When color of silica gel will gets change from blue to pink from Top to bottom?

0 Answers  

---

why m and c are shorted in wattmeter

1 Answers  

---

For electrical designers what are the standard should know? i want learn about this standards. how to get information/reference. anybody help in this regards please.

0 Answers  

---

why dc is used in control circuits for MV & LV switchgeras instead of ac

0 Answers  

---

what is mathed of check the D.C MOTOR 181 KW (ARMATURE AND FIELD) WHAT IS THE MATHED OF CHECK THE THYRISTOR MODULE (HIGH CURRENT)

0 Answers  

---

how to reduce shorting current in a slipring induction motor

3 Answers  

---

What is the difference in Line PT & Bus PT.

3 Answers   Bhel,

---

When a square wave is applied to primary of a transformer then what will be output wave form of secondary ?

2 Answers   Sail, TCS,

---

If I want to connect a capacitor bank on the HT side of a 11kV/415V, 3 phase delta-star distribution transformer to supply Reactive power to it..what practical specifications of a Capacitor bank that can i've??please reply..

0 Answers  

---

how to calculate the cable current ratingand and how much of distance the rating will be ok will the distance is incresed what the action we take

0 Answers  

---