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

Discussion

An auditor wishes to know the loading at which a distribution transformer is working most efficiently. That loading is the one at which

  • A.the load equals the transformer's full rating
  • B.the power factor of the load is unity
  • C.the secondary voltage equals its nominal value
  • D.the copper loss equals the iron loss

Answer: D

Differentiating the efficiency expression puts the maximum where the load-dependent loss has risen to equal the constant loss, which for most distribution transformers falls between forty and seventy per cent of rating. It is not at full load.

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

Post your comment

Please log in or register to post a comment.