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Engineering Material & Metallurgy Mcqs

Q:

Which of the following factors affect the mechanical properties of a material under applied loads?

A) Content of alloys B) Grain size
C) Imperfection and defects D) Shape of material
 
Answer & Explanation Answer: D) Shape of material

Explanation: Contents of alloys improve or decrease the hardness and strength of materials. Finer grain sizes improve the strength of the material. Imperfection and defects reduce the strength of the material. Shape, however, has little or no effect on the material.

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490
Q:

The ability of materials to develop a characteristic behavior under repeated loading known as ___________

A) Toughness B) Resilience
C) Hardness D) Fatigue
 
Answer & Explanation Answer: D) Fatigue

Explanation: Toughness is the ability of a material to absorb energy during deformation, while resilience is its capacity to absorb the energy. Hardness is the knack of material to defy indentation. The ability of a material to develop a characteristic behavior under repeated loading is known as fatigue.

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395
Q:

The permanent mode of deformation of a material known as _____________

A) Elasticity B) Plasticity
C) Slip deformation D) Twinning deformation
 
Answer & Explanation Answer: B) Plasticity

Explanation: Plasticity is defined as the property of a material due to which it is permanently deformed due to loading. Elasticity is the temporary form of deformation. Twinning and Slip are mechanisms of Plastic deformation.

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333
Q:

The tendency of a deformed solid to regain its actual proportions instantly upon unloading known as ______________

A) Perfectly elastic B) Delayed elasticity
C) Inelastic effect D) Plasticity
 
Answer & Explanation Answer: A) Perfectly elastic

Explanation: If the recovery of the solid is instantaneous and complete, it is known as perfectly elastic. Delayed elasticity is defined as the steady mode of solid recuperation, while the inelastic effect is when the recuperation of deformed solid is partial. Plasticity is the contradictory occurrence of elasticity.

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