Question

What is the mechanical strength of the end bells used?

(a) 1120 MN per m^2

(b) 1130 MN per m^2

(c) 1150 MN per m^2

(d) 1140 MN per m^2

The question was posed to me in an online quiz.

This intriguing question originated from Construction of Turbo-Alternators topic in division Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Correct answer is (c) 1150 MN per m^2

Easiest explanation: The end bells are made of a non-magnetic austenitic steel in order to reduce the leakage flux. The end bells have high mechanical strength of about 1150 MN per m^2.