For the same power rating,which motor is bigger in size,AC or DC?

Categories >> Engineering >> Electrical Engineering
Suggest New Category

Question Posted / niks_4u86

9 Answers
15648 Views
Bhel, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / oasis.enigneers@yahoo.com

The DC motor is biger then AC in size..

Is This Answer Correct ?

60 Yes

6 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / navaneetha

I think DC motor is bigger then AC in size..because as the
voltage is increased, the commutation, and sparking at
brushes increases.

Is This Answer Correct ?

15 Yes

5 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / kapil pandey

In AC- P = Root3 *V*I (for 3 phases) [ 3 core windings]
In DC - P= 3*V*I (for 3 phases)[6 core windings]
means for getting power sqroot3 times we have to wound
double. making the DC motor size bigger.
one more thing that the loss arresting system & protection
system shall also be bigger in case of DC.

Is This Answer Correct ?

8 Yes

3 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / nishant

i dink dc motor will be large ...bcz it require large conductors and large insulation bcz of a large dc .......

Is This Answer Correct ?

2 Yes

0 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / m tashfeen abbasi

The Dc motar bigger in size because the DC moter consist of Armature winding with commutater and inter pole winding, field winding and shunt winding

Is This Answer Correct ?

2 Yes

0 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / rabisankar

For 1phase AC machine P=v*i*cos (thita).
For 1phase DC machine P=v*i.
now cos(thita)<=1.
so for same power rating ac machine must have larger i than dc.
so thick conductor is required,so its size is larger than dc
machine.

Is This Answer Correct ?

0 Yes

8 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / mahesh

i think dc motor is smaller than ac its because in dc motor we can directly take the current from armature where as in case of ac motor it is taken from brushes and slip rings and extra components may include so the motor size is more for ac and it is less for dc

Is This Answer Correct ?

1 Yes

10 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / sunny

AC motor will be of bigger size because of the alternating nature of current to reduce eddy currents core is laminated & also the outer frame has given a shape for max. surface area to dissipate heat.

Is This Answer Correct ?

2 Yes

12 No

For the same power rating,which motor is bigger in size,AC or DC?..

Answer / niks_4u86

i think it has to be AC as to reduce the reluctance for flux the air gap provided gets the size of AC motor greater than the size of dc motor insulation

Is This Answer Correct ?

9 Yes

24 No

Post New Answer

More Electrical Engineering Interview Questions

What is a neutral

4 Answers Adani Ports, Dr Reddys,

different between highvoltage & lowvoltage source

5 Answers

Details about Flux Compensated magnetic Amplifer starter for motors

0 Answers

what is the difference b/w single and three phase circuits?

1 Answers

HOW TO CALCULATE GROUND FAULT CURRENT IN 430V 4000AMP AIR CIRCUIT BREAKER?

2 Answers

A.V.R maintains the voltage of a generator when it is in island mode but when the generator is synchronised with grid it maintenance the P.F,how it happens please any body explain it in detail.

2 Answers TATA,

What do you mean by dependent and independent voltage sources?

0 Answers

What is the working of SCM CT or purpose in genrator ?

3 Answers Bhel,

why neutral busbar size is SAME of the phase busbar size UPTO 200A IN LT PANELS

1 Answers IBS,

I am going to appear for the RRB Chennai junior Engineer online exam. Please send me the previous exams question papers (also solved) to my mail id: rrkhandhar@yahoo.com

0 Answers

without name plate detail of blower how we can find out the HP & Rpm ? the input voltage is 230v single phase

1 Answers

is it possible to flow a current between nutral and earth in a circuit? although nutral and earth having same potential diffrence? i=0/r=0A if any body now any solid reason because i am getting a triping problem in rcbo due to nutral and earth shorting???

2 Answers

For more Electrical Engineering Interview Questions Click Here