Engineering Materials - Study Mode
[#1] Recrystallization temperature can be lowered by
Correct Answer
(D) All of the above
Explanation
Solution: Recrystallization temperature can be lowered by Purification of metal and Grain refinement and Working at lower temperature
[#2] Ductility of a material can be defined as
Correct Answer
(C) Ability to undergo large permanent deformations in tension
Explanation
Solution: Ductility of a material has been defined as a ability of a material to undergo permanent deformation through elongation and reduction in cross-sectional area or bending at room temperature without fracturing.
[#3] Malleability of a material can be defined as
Correct Answer
(A) Ability to undergo large permanent deformations in compression
Explanation
Solution: Malleability is a physical property of metals that defines the ability to be hammered, pressed or rolled into thin sheets without breaking.
[#4] The ability of a material to absorb energy in the plastic range is called
Correct Answer
(D) Toughness
Explanation
Solution: Resilience: The ability of a material to absorb energy under elastic deformation and to recover this energy upon removal of load is termed as resilience. Resilience is indicated by the area under the stress strain curve till the point of elastic limit. Creep: It is a deformation of a material due to the constant load for a long period of time. It is time and temperature dependent property of material. Fatigue: When a body is subjected to repeated and fluctuating load it tends to develop a characteristic behavior under which failure occurs which is referred to as fatigue. Toughness: The ability of a material to absorb energy in plastic deformation till the point of fracture is known as toughness. Toughness is indicated by the total area under the stress strain curve up to the fracture point. Eg. Copper has higher toughness than Cast iron.
[#5] Muntz metal contains copper and zinc in the ratio of
Correct Answer
(C) 60 : 40
Explanation
Solution: Muntz metal is about 60% copper, 40% zinc