Answer / avnish sharma

1. check out for Brushes. If Brushes are there then it is for sure DC motor. If not then

2 Cooling fins for ventilation are to be checked. if cooling fins are there, then it is AC motor.
Cooling fins can be seen from a long distance also as it is external....

Answer / hemang

basically main diff between AC and DC motor are
1.DC motor having commutator,carbon brush and heavy
weight,big motor instead of same KW and rating of AC motor

Answer / manoj

To check it physically check the following
1. starter mostly frequency based starter for AC motor to
acheive energy saving
2. connection : AC has star/delata wnding connection
3. Dc motor always have carbon brushes
4. Dc motor is used for constant torque application.
5. Ac motor has Rotor and DC has Armature

Answer / abel akponah

DC motor has commutators, with segment, brushes and its
holders and a rewound rotor known as armature.
while AC motor has stator and rotor sometimes rewound rotor
with slip ring on the shaft

Answer / n.veeratejeswar

For dc motors the outer part of stator surface is smoothly
and for ac motors there is a numbber of fins parallel for
cooling purpouse

Answer / arun

D.C motor can be differentiated by means of its rotor part.
Because of rotating magnetic field A.C motors will have
mostly squirrel cage rotors.

Where as all D.C motors will have slip ring brush
arrangements in its rotor.

Answer / vikas

we can check the dc and ac motor by just seeing from
outside.....if we carefully see the outer perifery of both
the motor then dc motor have bolts mounted outside through
which poles are connected in stator but this is not the case
of ac motor....so we can differenciate...

Answer / abhishek kumar

In all dc motors
there is a
commutator
found for
operation.but ac
motors have no
comttr foun for
its work.

Answer / namo narayan singh

DC MOTOR having commutator segment,carbon brushes with
holders,
AC MOTOR having wide use of squerrel cage rotor, large in
size,

Answer / babilla

in the dc motor direct current is given.
in case of ac motor it works on the induction principle.
only in ac squirrel cage & slip ring IM

Why we use a shunt capacitor or synchronizing Motor To Improve a Power factor pls reply me in this mail dinesh_elect_eng@yahoo.com

4 Answers  

what is the workimg of ct &pt?

5 Answers  

What is x/r ratio?

1 Answers  

please explian how may types of maintenance works.

4 Answers   HP,

why crgo core is used in transformers?

6 Answers   Bhel, TATA,

Explain the difference between verilog task and verilog function?

0 Answers  

what is a core company? why should we join a core company?

1 Answers  

Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

0 Answers   Pride Hotels,

what transformer we used normally and upto which kva?

0 Answers  

A 100 MVA transformer may be cooled with?

6 Answers   HCL,

why we use condenser in the thermal power plant, althrough the same vapour will be again heated

0 Answers   Bhel,

what is neutral?

2 Answers