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The frame size is designated by a number which is its centre height expressed in mm.

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The frame size is designated by a number which is its centre height expressed in mm.

(a) true

(b) false

The question was posed to me during an online exam.

Enquiry is from Separation of D and L, Standard Frames in section General Concepts and Constraints in Design of Rotating Machines of Design of Electrical Machines

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Correct option is (a) true

To elaborate: The IEC 72 lists a coherent range of main dimensions with the central heights ranging between 56-1000 mm. The frame size is designated by a number which is its centre height expressed in mm. The frame designated 180 has a centre height of 180 mm.

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