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A shell type transformer has its core

  • A.reduced to a single straight limb through the coils
  • B.absent entirely
  • C.made of solid steel rather than laminations
  • D.surrounding the windings on more than one side

Answer: D

Correct answer: surrounding the windings on more than one side

In a shell type transformer the windings sit on a central limb and the core encloses them on both sides, so the magnetic circuit surrounds the coils. In a core type the coils surround the limbs instead. The shell arrangement gives better mechanical bracing against short circuit forces and a shorter mean flux path.

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