Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

Hollow shafts can be made as strong as solid shafts by making the twis

1.	Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
A.	forging
B.	cold rolling
C.	hot rolling
D.	casting
Answer» C. hot rolling

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Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

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