Answer / vinod

Actually for DC machines input was AC Voltage (alternating in nature) so the output was also absolutely in AC. So we need to give the output in DC, that's why we use COMMUTATOR as a MECHANICAL RECTIFIER.
(Simply) COMMUTATOR is used to convert AC into DC like a RECTIFIER

Answer / dileep

commutator converts i/p DC of the motor to AC in the rotor
i.e armature .so here it is acting as an inverter ........
it acts as a rectifier in the case of DC generator

Answer / madhupriya

The purpose of commutator in dc motor is that it provides continuous unidirectional torque for the rotor to rotate

what is the minimum bdv value for 400 kva transformer?

2 Answers  

---

What is the difference in Line PT & Bus PT.

3 Answers   Bhel,

---

ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]

0 Answers  

---

being an electrical engineer why you wanna come into software i have an very good academics what answer i have to give

0 Answers  

---

how do u get less voltage in star connection

4 Answers   BARC,

---

---

transformer cooling fan kharab ho jaye to 1-off kar dena chahiye 2-load kum kar dena chahiye 3-koi frrk nhi padta 4-sub galat hai. choose right option

2 Answers   PGVCL Paschim Gujarat Vij Company Limited,

---

Does Lightening arrest requires Earthing?..

5 Answers  

---

WORKING PRINCIPLE OF HALOGEN LAMP & MEQUERY LAMP

1 Answers  

---

what is the function of Choke?

9 Answers   Airport Electrical, Cummins, Tamco,

---

what is the VA(Volt-amphere)? define with calculation?

0 Answers  

---

what is the advantage and disadvantage of billing in kwh and kvah by electricity board .

6 Answers   Nespak, NTPC,

---

difference between analog pressure gauge & digital pressure gauge?

1 Answers  

---