Engineering Materials - Study Mode

[#176] The percentage carbon content in wrought iron is about
Correct Answer

(A) 0.02

Explanation

Solution: Wrought iron is a form of commercial iron containing less than 0.10% of carbon, less than 0.25% of impurities total of sulfur, phosphorus, silicon and manganese, and less than 2% slag by weight. Wrought iron is redshort or hot short if it contains sulfur in excess quantity.

[#177] Age-hardening is related with
Correct Answer

(D) Duralumin

Explanation

Solution: age hardening is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels and stainless steels. Age-hardening is related with duralumin

[#178] A specimen of aluminium metal when observed under microscope shows
Correct Answer

(B) F.C.C. crystal structure

Explanation

Solution: A specimen of aluminium metal when observed under microscope shows F.C.C. crystal structure

[#179] The correct sequence for descending order of machinability is
Correct Answer

(A) Grey cast iron, low carbon steel, wrought iron

Explanation

Solution: The correct sequence for descending order of machinability is Grey cast iron, low carbon steel, wrought iron

[#180] The ability of a material to resist fracture due to high impact loads, is called
Correct Answer

(C) Toughness

Explanation

Solution: Toughness is the ability of a material to absorb energy and plastically deform without fracturing. Toughness is the amount of energy per unit volume that a material can absorb before rupturing.