Discussion
A machine is found to spark at its brushes whenever the load increases. The fitting that would most directly address this is one that
Answer: B
Correct answer: neutralise the reactance voltage and improve commutation
Sparking that worsens with load points to the reactance voltage induced in the coil undergoing commutation, which grows with the current being reversed. Interpoles - narrow poles set on the magnetic neutral axis and wound in series with the armature - produce a flux proportional to that current, inducing an emf that opposes the reactance voltage and forces the current to reverse in the time available. Being series-connected, they compensate automatically at every load.
No comment is present. Be the first to comment.
Loading…
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