*/*_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

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