what is the purpose of commutator in DC motor?

3 Answers  

---

WHAT ARE THE BELT HORMONICS IN AC MACHINE HOW TO REDUCE IT

2 Answers   DRDO,

---

practically What is power factor

6 Answers  

---

What is meant by Active and reactive power?

5 Answers   Siemens,

---

what is load shedding

4 Answers   KSEB,

---

neutral carrying current more than phase in 3phase supply.i want to know the reason?

2 Answers  

---

Pls explain about full theory of salient pole generator?

1 Answers   Kirloskar,

---

i have applied for junior engineer 2 c&w for Guwahati RRB please send me last five year question paper

0 Answers  

---

where solid grounding and where grounding through ngr done and why?

0 Answers   NTPC,

---

In motors how many types of cooling systems were used?

0 Answers   NTPC,

---

why the starting torque is high in dc series motor..

3 Answers   GM General Motors,

---

What is highest size of HT motor like 11 kv or 33 kv,and how to make it 750 rpm.i think the size will be very big.any idea ? pl. reply..

0 Answers   ABB,

---