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Question
difference between a four point starter and three point 
starter
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
the shunt connection in four point stater is provided
separately form the line where as in three point stater it
is connected with line which is the drawback in three point
stater
 
Is This Answer Correct ?    119 Yes 28 No
Venkatesh
 
Answer
# 2
In three point starter NVR (no voltage relay)is series with
shunt if voltage falls certain value NVR De energized due to
insufficient magnetic field and motor turned off. But in
four point starter NVR energized directly from DC supply
thus the draw back of 3 point starter rectified
 
Is This Answer Correct ?    92 Yes 13 No
K.sathish Kumar
 
 
 
Answer
# 3
a motor can be run for a higher speed than normal speed by reducing the field current. reduced the field current may not produce enough magnetic force to hold the handle in on position. so handle returns to off position. this is the disadvantage of three point starter.this is the advantage of four point starter. it will not returns to off position 
Is This Answer Correct ?    24 Yes 10 No
V.l.kanth
 
Answer
# 4
Explin the fundamental equations usedin design of electro magnet. 
Is This Answer Correct ?    9 Yes 14 No
Deep
 

 
 
 
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what is difference between induction motor&servo motor.what r types of servo motor?how it works?   1
 
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