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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 ?    121 Yes 29 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 ?    96 Yes 14 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 ?    27 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
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is the working principle/operation/theory of 3-phase rectifier power transformer used in cold rolling mills. TATA 1
why some transmission lines have 7 wires n why some have 3 n 4??   3
What happen if LV supply is fed to a HT motor? ITC-Infotech 18
what is a starter ?? NPTC 2
what is Real power and Reactive power ? what is difference between them ?   5
What is skin effect?   1
what is the permissible bend in the LT& HT CABLES.   2
how do we fix the rating of mcb required for a specific capacity of the electric motor   2
can we step up dc power using transformer?   15
how capacitance is neglected in short transmission lines ? Qucab 1
what is the formular for the calculation of CT'S when installed as part of a electrical installation so the correct meter is used   2
In oil transformer which oil is used & what should be the insulation resistance & heating capacity.   2
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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