Discussion
An autotransformer starter differs from a star-delta starter in that it
Answer: A
Correct answer: allows the reduction ratio to be chosen
An autotransformer starter can be tapped at 50, 65 or 80 per cent, so the reduction can be matched to the load rather than fixed. Star-delta gives one ratio only, and it requires all six winding ends brought out to the terminal box, which the autotransformer does not. At a tapping \( k \) the starting current and the torque both fall as \( k^2 \) at the motor, so the autotransformer gives more torque than star-delta for the same line current.
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