Starters are used with D.C. motors because______________?
Correct answer: D. to restrict armature current as there is no back e.m.f. while starting
- A. these motors have high starting torque
- B. these motors are not self-starting
- C. back e.m.f. of these motors is zero initially
- D. to restrict armature current as there is no back e.m.f. while starting
Explanation
At starting, the motor has zero back e.m.f., so the armature would draw an excessive current limited only by its very low resistance. A starter inserts resistance to restrict this current until back e.m.f. develops.
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