Q. Auto frettage is a

(A) extra cover provided on seamless pipes to increase their hoop stress
(B) a means of inducing favourable residual stresses in pressure vessels
(C) Increasing the diameter of threaded portion
(D) a heat treatment for pressure vessels subjected to low temperatures

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✅ Correct Answer: (B) a means of inducing favourable residual stresses in pressure vessels

Published by Mr. Dubey ⭐ 109.99K Points at 20-Sep-2023 12:37 pm in Machine Design

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