Option 1: Control speed
Option 2: Improve efficiency
Option 3: Limit starting current
Option 4: Increase torque
Correct Option: 3
Explanation
Starter inserts external resistance to limit huge starting current.
Option 1: Control speed
Option 2: Improve efficiency
Option 3: Limit starting current
Option 4: Increase torque
Correct Option: 3
Starter inserts external resistance to limit huge starting current.