Engineering Materials - Study Mode

[#86] Induction hardening is basically a
Correct Answer

(B) Surface hardening process

Explanation

Solution: Induction hardening is a type of surface hardening in which a metal part is induction-heated and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and brittleness of the part.

[#87] Which of the following is not the correct method of increasing fatigue limit?
Correct Answer

(D) Surface decarburisation

Explanation

Solution: Decarburization is a surface degradation phenomenon in the forging and heat treating of steels.

[#88] The property of a material which enables it to retain the deformation permanently, is called
Correct Answer

(D) Plasticity

Explanation

Solution: plasticity describes the deformation of a material undergoing non-reversible changes of shape in response to applied forces.

[#89] The brown smoke during the operation of a Bessemer converter indicates that the
Correct Answer

(A) Air is burning out silicon and manganese

Explanation

Solution: The brown smoke during the operation of a Bessemer converter indicates that the Air is burning out silicon and manganese

[#90] The charge of the blast furnace consists of
Correct Answer

(A) Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

Explanation

Solution: The charge of the blast furnace consists of Calcined ore (8 parts), coke (4 parts) and limestone (1 part)