what is the vvvf in the dumbwaiter?? or lift. what is the actual process?/

0 Answers  

---

Why we use modulus with voltage in stability equation that is P=[E][V]SIN@/X WHY VOLTAGE IS IN MODE VALUE WHAT IS THE REASON?

1 Answers   Bhel,

---

We have 250 KW x 2 motors, which are load from 25% to 100% varying load in every minute , so how can we compansate the power factor. pl give your opinions on the above subject.

0 Answers  

---

why threre are two parallel lines in transformer's symbol?

11 Answers   NTPC,

---

In separately excited m/c,we excite the field by a dc source,what not with ac source?

1 Answers  

---

why doesnt the back emf hold the speed of unloaded series motor?

1 Answers  

---

why Current is lead 90 degree and voltage is lag 90 degree in a capacitor.? why Current is lag 90 degree and voltage is lead 90 degree in an inductor.?

0 Answers  

---

a induction motar has 30-35% exciting current at no load but in transformer it is only 2-3% ofbrated current why any reason?

1 Answers   century,

---

What is defference between earthed and unearthed cable(HT)? Which is better for under ground cabling?

1 Answers  

---

role of europe union in UK safety legistlation (electrical safety)

0 Answers  

---

Pure inductive ckt takes power from AC when 1. Applied voltage and Current increases 2. applied voltage and current decreses 3. voltage decreases and current decreases please justify

2 Answers  

---

Sir I hv to fix 20 ton ac how much electrical power need apply?

1 Answers   Sealand Restaurant,

---