Discussion
The Maximum torque of DC series motor is limited by:
Answer: B
The maximum torque of a DC series motor is limited by commutation.
A series motor's torque rises with the square of the current until saturation and then roughly in proportion to it, so in principle it can develop very large torque. In practice the armature current, and therefore the torque, cannot be pushed beyond the point at which the brushes can still commutate the current without heavy sparking; above that the commutator and brushes are damaged.
The type of brush and the armature current are factors in that limit, but the limiting phenomenon itself is commutation. Speed falls as torque rises in a series motor, so it is not what limits the torque.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development