Discussion
Which of the following motors has the largest starting torque?
Answer: D
The largest starting torque is that of the repulsion motor.
A repulsion motor has a commutator armature whose brushes are short-circuited and displaced from the field axis. It develops a very high starting torque, about three to four times full-load torque or more, with moderate starting current, which is why repulsion and repulsion-start motors were used for heavy single-phase drives.
Capacitor-start motors have high starting torque but generally below that of the repulsion motor, split-phase motors have moderate starting torque, and shaded-pole motors very low starting torque, suitable only for small fans.
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