[Solved] Four-point starter is used when

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Q.	Four-point starter is used when
A.	motor field current is varied in narrow range
B.	motor speed is varied in small range
C.	motor field current is varied over wide range
D.	can be used anywhere
Answer» C. motor field current is varied over wide range
Explanation: three-point starter is employed where motor field current can be varied in a narrow range and so does the motor speed while four-point starter is used when motor field current can vary over a wide range and so does the motor speed.

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