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

Discussion

Space heaters are fitted in a large machine to

  • A.raise the winding temperature during a load test
  • B.improve the efficiency of the machine in service
  • C.reduce the vibration of the rotor at rated speed
  • D.keep the windings above the dew point when it is idle

Answer: D

Correct answer: keep the windings above the dew point when it is idle

A machine standing still cools to ambient, and when the air is humid the windings condense moisture on their surfaces. Space heaters hold the winding a few degrees above ambient so the dew point is never reached, and they are interlocked to switch on whenever the machine stops.

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

Post your comment

Please log in or register to post a comment.