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Question
Whats difference between a single phase & a three phase 
motor?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Single phase motor has pulsating magnetic field and three
phase motor has rotating magnetic field
 
Is This Answer Correct ?    24 Yes 2 No
Jijomon
 
Answer
# 2
3-phase motors are self starting,whereas the single phase
motors are not self starting.
 
Is This Answer Correct ?    17 Yes 7 No
Venkatakrishnan
 
 
 
Answer
# 3
single phase motor can't self started so we use another winding only in starting and then this winding disconnected due to motor speed and also connect a capacitor to make phase different to generate rotating magnetic field but in 3 ph this not happened because rotating magnetic field is self generated due to phases different angle which shifted by 120 degree 
Is This Answer Correct ?    15 Yes 6 No
Ahmed Hamdy
 
Answer
# 4
The starting circuit of of a3-phase motor has a contactor
wherein all the 3 phases of the supply are connected to it.
Whereas in 1-phase motors only 2 phases are required & the
third input of the contactor is looped from it's own
output.The main diffrence can be spoted in the power
diagram itself.
 
Is This Answer Correct ?    11 Yes 12 No
P. Naik
 

 
 
 
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For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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