Answer / pratik

When motor is overloaded for longer duration it's current Ia increases which cause heat in winding and as the heat increases the flux produced by the winding comes to saturation at one point,and so the motor stops to rotate.

what is the criterion for selecting vector group of Transformers ? i mean how to decide vector group of Generator transformer, substation trasformer and transformer at consumer end

0 Answers   Areva,

---

Which motor runs on both ac and ac? a) dc series motor b) reluctance motor

2 Answers  

---

why field rhoestat is kept in minimum position while armature rheostat at maximun position?

3 Answers  

---

How much area is covered by a single lightning arrestor to protect object from lightning strokes ?

1 Answers  

---

whow we find out dc motor field aur armature resistance

1 Answers  

---

how braking & making capacity of circuit breaker are calculated?

0 Answers   Bhel,

---

why we use 11 kv 22 kv and so on ?

1 Answers   Air Force,

---

What are the disadvantages of autotransformer?

0 Answers  

---

where connected OLTC for transformers?

3 Answers   Apollo, CBRE,

---

wat is mean by HRC fuse... WHY we choose it...?

3 Answers  

---

What is the physical significance of phase.. i.e. what is exactly the meaning in layman's language.. 1 phase, 3 phase etc ???

0 Answers   L&T,

---

What is the formula to calculate the KVAR value of a capacitor, while value of capcitor in farads is known.

1 Answers  

---