A. high starting torque is required
B. load torque is heavy
C. heavy pull out torque is required
D. all of the above
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The Answer Is .A
This is because slip-ring motors come with an external circuit that controls the speed of the motor and can provide maximum starting torque compared to squirrel cage motors.
Additionally, they have brushes for transferring power, which is usually made from carbon due to their numerous advantages.
However, the brushes need to be replaced periodically as they wear out due to continuous sliding over the slip rings.