51) Cementite is ? a) an intermetallic with the formula Fe 3 C b) calcium oxide

Question

51) Cementite is ?

a) an intermetallic with the formula Fe3C

b) calcium oxide and silica that reacts to form concrete

c) pure ferrite

d) the eutectoid iron carbon morphology

.

52) Bronze is an alloy of ?

a) nickel and iron

b) iron and tin

c) copper and tin

d) copper and zinc

.

53) In ion tempering, glass is submerged into a molten salt bath to allow

a) smaller ions to ion exchange into glass surface to toughen the structure by placing surface under tension relative to interior

b) smaller ions to ion exchange into glass surface to toughen the structure by placing surface under compression relative to interior

c) larger ions to ion exchange into glass surface to toughen the structure by placing surface under tension relative to interior

d) larger ions to ion exchange into glass surface to toughen the structure by placing surface under compression relative to interior

Please answer all of them without guessing!!! Thanks

Explanation / Answer

51. a

52. c

53. b

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