What is the formula for the thickness of the ac machines?(a) thickness = 40 * inner diameter of frame/12(b) thickness = 40 + inner diameter of frame/12(c) thickness = 40 – inner diameter of frame/12(d) thickness = 40 * inner diameter of frame*12This question was posed to me in final exam.I'd like to ask this question from Frames of D.C. & A.C. Machines in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines

What is the formula for the thickness of the ac machines?(a) thickness

1.	What is the formula for the thickness of the ac machines?(a) thickness = 40 * inner diameter of frame/12(b) thickness = 40 + inner diameter of frame/12(c) thickness = 40 – inner diameter of frame/12(d) thickness = 40 * inner diameter of frame*12This question was posed to me in final exam.I'd like to ask this question from Frames of D.C. & A.C. Machines in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» The CORRECT answer is (a) thickness = 40 * inner DIAMETER of frame/12 To ELABORATE: The thickness of the ac machines depend UPON the inner diameter of the frame. On obtaining the inner diameter of frame and on substitution GIVES the thickness of ac machines.

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