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| Q. |
Why starters are required in a DC motor? |
| A. | back emf of these motors is zero initially |
| B. | these motors are not self-starting |
| C. | these motors have high starting torque |
| D. | to restrict armature current as there is no back emf at starting |
| Answer» D. to restrict armature current as there is no back emf at starting | |
| Explanation: at the time of starting (n=0), the induced emf of a motor is zero such that current drawn by armature, from rated voltage supply would be ia= v/ra. since armature resistance is very low, armature current drawn is very high and will damage the machine. | |
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