Answer / chinna

commutator is unit which converts AC voltage into
Unidirection DC Voltage. The voltage generated in the DC
machine is in alternating nature. Because of this reasion
commutator is attached with DC machine.

Answer / amirtha

becoz to get dc output we are conneting commutator.from the
armature commmutator collets the ac current and convert it
to dc.tnis is not needed in ac machine

Answer / dany

Commuttor is vital part in especially DC machines.
it is the place where commutation will be take
place ,commutation means reversal of current direction in
current carriying armature coils or simply conversion into
DC .
SINCE in AC machines there is no need of DC output we dont
use commutators

Answer / prashant

actually in all rotating m/c ac is generated in rotor. and
commutator acts as invertor in motor and as rectifier in
generator

Answer / m.ravi

in dc generator it makes bidirectional current to
unidirectional current
in dc motor it makes unidirectional torque

Answer / swati agarwal

it is a mechanical rectifier which convert ac to dc in generator o/p.and dc to ac in case of dc motor

Answer / zakeer

it collects current from windins and the max torque of dc motor is is limited also it gives unidirectional torque

Answer / aviral

commutator is unit which converts AC voltage into
Unidirection DC Voltage. The voltage generated in the DC
machine is in alternating nature. Because of this reasion
commutator is attached with DC machine.

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

What is the difference between a Vacuum Circuit Breaker and a Load Break Switch?

7 Answers  

which %age of corona losses increses if frequency is increased to 25%.

3 Answers   ADCET, Maihar Cement,

What is a dc motor?

0 Answers  

why power generated only 11KV not more than???????? and why power up/down is multification of 11*?=??.??? foe Example 11/33,11/66,66/11KV etc,

8 Answers   Essar,

How to do bus bar short circuit calculation for 230KV/11kv, 60 MVA Substation?

0 Answers   ABB,

can we use heat gun instead of gas torch in 11kv termination kit. I mean can both sources provide enough amount of heat to ensure the uniform shrinkage of sleeve.

1 Answers  

Hello, im taking an introduction to PLC..and i'm having a hard time on creating a program for 2 lamps blinking alternately with this button characteristics: 1.) One push button (starts upon pressing) 2.) Same push button (when pressed again, will pause the system) 3.) Same push button (when pressed again, will continue the paused system) 4.) Same push button (when pressed within 2 seconds, will shut off the system) Pls..i know this is just a simple problem for you guys..

2 Answers  

I have 2 Nos of 2500kVA 33/0.415V cast resin transformers. How to decide on ampere rating of HT Panel? Also advise me how many panel RMG i have to consider whether 4 panel ok?

1 Answers  

ohms law aplicable

16 Answers   APGenco,

Can anybody tell abt concrete encased earthing or grounding?

0 Answers  

in trains i have seen the terminal which is connected at the top of the train is positive .where is negative ? track? i dont think so

9 Answers