Discussion
A drive running continuously at ten per cent of base speed on a self-ventilated machine needs
Answer: B
Correct answer: forced ventilation or a torque derating
A self-ventilated machine carries its fan on its own shaft, so at ten per cent speed it has almost no cooling air while the stator current, and hence the loss, may be at full value. Either a separately driven blower is fitted or the permissible torque is reduced, and the derating curve for continuous low-speed running is part of the machine data.
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