Answer / mrssa

in contactor when its coil supplied with dc ..the position of its contacts changed n.o to close and n.c to open
contactor is connecting device
c.b is protective device when current increase than rated c.b trip

Answer / k.prakashchandra

Basic difference - CB trips when the trip coil is energized, in csae of contactor , the hold coil is de- energized to trip .

Answer / sheikh

there are major difference b/w contactor and circuit breaker. contactor has moveable contacts and fixed contacts
while Circuit breaker only have fixed contacts. contactor have become energized when it,s coil would be got supply or been energized. however these are 2 different things.
Ampacity may be same both of equipment.

What will happen if we give transformer a dc not ac

5 Answers  

---

What is precision of a measurement?

0 Answers  

---

how to syncronize two dg sets

3 Answers  

---

What is surger vector in 33Kv transmission feeder? We have AC power generator of 8MW which is paralleled with 33Kv EB grid. Some times our HT breaker gets trip off due to surge vector problem. How to over come it? Is there any device to observe the surge and avoid tripping?

3 Answers  

---

What is Torque Vector Control in VVVF Drives?

6 Answers   PEL, Schneider,

---

---

List few applications of d.c series motor?

0 Answers  

---

How to measure size of cable on a given load

0 Answers   Green India Engineering Solutions,

---

What is the function of trip neutral close switch?

11 Answers  

---

What Normal(Tangent) towers and Tension(Cut-point) Towers?

1 Answers   ABB, BGR Energy, NTPC, Powermec,

---

why the frequency in india is 50 50HZ why we not select the o ther frequncy range?

6 Answers  

---

difference btw neutral and ground?

2 Answers   ERG,

---

iam preparing for rrb section engineer post in electrical branch.suggest the right textbook for my reference.fromwhere i will get the previous q.papers?

0 Answers   RRB,

---