Discussion
A synchronous motor started with its field already excited will
Answer: B
Correct answer: fail to accelerate, the average torque over a revolution being zero
With the field excited from standstill, the rotor poles are alternately attracted and repelled as the stator field sweeps past them, so the torque reverses twice each revolution and averages to nothing. The rotor merely vibrates. The field must be applied only once the machine is turning near synchronous speed.
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