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Question
why we use dc motor instead of ac motor?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Because dc motor have high starting torque than ac motor
so...
 
Is This Answer Correct ?    42 Yes 5 No
Navnit Bhimani
 
Answer
# 2
due to high starting torque and smooth speed control these
motors are preferred in many application but in present
scenario all dc motors are replacing by electrical drives
due to development of power electronics like IGBT etc. the
DC motor requires high maintenance compare to AC motors and
with IGBT driven ac motors we can get smooth speed and
torque control.
 
Is This Answer Correct ?    37 Yes 2 No
E Venkat Reddy
 
 
 
Answer
# 3
EVEN NOW DC MOTORS ARE PROFFERED BECAUSE.....

1.HIGH STARTING TORQUE.

2.EASY CONTROL OF FIELD EXCITATION SO SPEED CAN BE
CONTROLLED

3.HIGH SPEED VARIATION IS POSSIBLE

4.BETTER STARTING AND BRAKING CHARACTERISTICS

used in lifts,hoists,cranes,traction systems........
 
Is This Answer Correct ?    24 Yes 3 No
Sunil Guru
 
Answer
# 4
Because of high starting torque at verioues speed. 
Is This Answer Correct ?    13 Yes 3 No
Sudhir Patil
 
Answer
# 5
With the advancement of AC drive technology AC motors can
do just about anything a DC motor can do. They can develop
full torque at zero RPM, once the holy grail of DC,have a
wider speed range, and amost zero maintenance requirments.
And to top all that from an intial cost stand point AC
motor/drive combinations are much cheaper. As for
industrail application, in the vast majority AC is the
prefered mehtod.
 
Is This Answer Correct ?    3 Yes 0 No
John Davidson
 
Answer
# 6
Because it can be operated using rechargeable batteries, its easy availability and small size. 
Is This Answer Correct ?    1 Yes 4 No
Priyadarshi Pritam
 
Answer
# 7
along with poibilty of carrying small dc batteries 
Is This Answer Correct ?    1 Yes 5 No
Venki
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
if the load is reactive then what is the use of calculating the real power and what is the use of reactive power if my question is wrong please excuse me..   1
what is the diffrent between ups and inverter Abb 2
Which of the following are the important limitations of rod gap surge arresters? 1. They are not capable of selling off power frequency follow up current. 2. After a discharge, the rods are destroyed completely. 3. Performance is affected by climatic conditions. Use the following codes for selecting the correct answer. Codes: (a)1, 2 and 3 (b)1 and 2 (c)2 and 3 (d)1 and 3   1
What is the current carring capacity of 0000SWG and 0SWG overhead solid bare copper conductor. If possible please provide reference for various sizes Vs current ratings   1
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what is the meaning of bus bar, in electrical panels.   10
 
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