Question

What happens when the diameter under armature is 150 mm or above?

(a) diameter of the shaft in bearing is 100 mm smaller than the maximum diameter

(b) diameter of the shaft in bearing is 90 mm smaller than the maximum diameter

(c) diameter of the shaft in bearing is 70 mm smaller than the maximum diameter

(d) diameter of the shaft in bearing is 50 mm smaller than the maximum diameter

This question was addressed to me during an interview.

This is a very interesting question from Design of Shaft topic in division Aspects of Design of Mechanical Parts of Design of Electrical Machines

Answer 1

Right option is (d) diameter of the shaft in bearing is 50 mm smaller than the maximum diameter

Easiest explanation: The diameter of the shaft in the bearings is less than the diameter under the armature. The diameter of the shaft in bearing is 50 mm smaller than the maximum diameter.