Answer / sangay dorji

soft starter starts the motor slowly at some point and
keeps the speed of the motor constant from that point,
where as variable frequency drive controls the speed of the
motor with respect to frequency.

Answer / m.aqeel

in soft start we control the flux by taking v/hertz ratio
same.
flux directly propotional to v/f
and diffrence between vfd and softstart is only that in
soft start we just control motor in startion and in vfd
case we control motor at any time starting stopping etc

What are the characteristics of negative feedback?

0 Answers  

---

how do u gauge the size of the cable ?for eg. consider a 300 sqmm L.T Cable.How do u determine the size of the cable seeing it pratically?

0 Answers   Bhel, Jai Balaji, Rashmi Group,

---

WHY CFL can't made in shape of bulb.

5 Answers  

---

How to test lightning Arrester?

0 Answers  

---

) why transformer cannot rotate though the principle behind induction motor is similar to a transformer

3 Answers  

---

---

ohms law is applicable for dc or ac current or for both??? explain it berifly??

3 Answers  

---

what is difference between earthingpits,earthing grid & earthing mess?

0 Answers   TATA,

---

Which is the best between SCADA & PLCC & Why ?

2 Answers   ABC,

---

what is the diffrence between voltage and current?

11 Answers  

---

what is the equation of insulating resistance of motor???

1 Answers   Birla,

---

In a ordinary plug can we hold the earth in hane and connect the circuit to supply?will we get a shock?

5 Answers  

---

In alternator generally we give DC voltage to field of alternator but field (excitor)produce Ac & converts into DC by rotating rectifier(RR ) then fed to rotor .my question is why we cannot give dc voltage directly to rotor instead of Excitor & RR ?

1 Answers  

---