rotation of dc shunt motor is revers by using 2
methods,which method is best and why??
(please answer if you know correct answer)
Answer Posted / nithi
reversing the armature terminal is better & applied in
practice.this is becoz of the following drawbacks in field
reversing method.
* high voltage build-up during reversing the field terminal
which is high enough to puncture the insulation of field
coil.
* high flash-over will occur.
* during reversal, the armature current should be limited
to the rated value,otherwise it will draw twice the time of
starting current.we can insert the external resistance to
limit the current while reversing the armature
terminal.whereas,in field reversal we cannot give any
provision to limit armature over current.
Is This Answer Correct ? | 25 Yes | 8 No |
Post New Answer View All Answers
What are the differences between incompressible and compressible flows?
What is Round-Robin scheduling?
Discuss the importance of materials selection in aeronautical engineering and how it impacts aircraft performance.
WHAT IS THE QUANTITY OF DBM
What is the output of two rams in a E plane Tee?
Explain what made you choose aerospace engineer line as your career?
What are some recent advancements in aeronautical engineering that have caught your attention, and how do you think they'll shape the industry?
What are the different stress types present in aircraft operations?
what is the slope angle of the APPROACH LIGHT? and How to calculate it?
How is switching system useful?
What will be the responsibility of the spacecraft controls?
What are the conditions given for the two flows to be dynamically similar?
Is it possible to open flight door at high altitude?
Explain FPGA?
what do you mean by stalling of aircraft?