Answer / iamdon

Induction Motors are designed for COMPARATIVELY LOW VALUE
OF B.Because if we select higher value of B,the magnetizing
current requirement for establishing the working flux in
the air gap will became high.This reduces the power factor.
This condition is undesirable hence must be avoided.

DC machines are designed for COMPARATIVELY HIGH VALUE OF B.
Because if we select lower value of B,the amount of force
developed will became small.Since there are large spaces
available on poles,so we have no difficulty in putting
extra number of turns on it for getting higher value of B.

Author:arbelectbit@yahoo.com

why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero

7 Answers   HCIL, Jindal, Siemens,

---

What do you mean by ratio correction factor of instrument transformer?

0 Answers  

---

The Frequency is measured by _________ bridge ?

3 Answers  

---

Why high Voltages come in multiple of 11, like 11 KV, 33KV, 66 KV, 132 KV etc.

11 Answers  

---

phase colour is indicated by R Y B (red yellow blue) but in transformer i have seen U V W instead of (R Y B) have any meaning of this

3 Answers   Areva, Kim Yew,

---

What is the Difference Between choke & ballast

3 Answers   ABB, ICS Integrated Computer Solutions,

---

sigal phase supply is 230 v ac two phase supply is 415 v ac then why three phase supply having supply is 415 v ac why not 690v ac

2 Answers  

---

How much sq,mm cable need for 800 amps load

2 Answers  

---

11 KV Power cable end earth connection insulation got burned wht is the reson pl give the resons

2 Answers  

---

Why we are mostly using a single 3-phase transformer instead of three 1-phase transformers?

7 Answers  

---

When we use 3 terminal resistor?

0 Answers  

---

why would amp draw on neutral wire be as much as amp draw on the hot leg.

0 Answers  

---