Machine-translated by Google. Questions are authored in English.
Top

Discussion

Separating core loss from friction and windage in an induction machine is done by

  • A.measuring the winding resistance at two temperatures
  • B.loading the machine fully and measuring its output
  • C.running the no-load test at several voltages and extrapolating
  • D.blocking the rotor mechanically and measuring the input power at rated current

Answer: C

Core loss falls roughly with the square of the voltage while mechanical loss depends on speed alone, so a plot against voltage squared extrapolates to the mechanical loss at zero voltage. It is the standard construction.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.