48. The steel for drop forging is heated toa ;. .,
(A) Light heat (B) “Highly plastic state
(€) Red hot (D) Liquid state
49. The hardened parts must be [ടട the hardening strains and to increase the
toughness of the paris.
{A) Tempered (B) ‘Annealed (©) Carburized (D) Anodized
50, To anneal hard steel, the steel must be heated abpve its critical temperature and then :
(A) Cooled rapidly (18 Quenched in oil
(C) Cooled slowly ' (I))Quem....
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