Mechanical Aptitude Structural Mechanics and Materials Questions and Answers Flashcards
6 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Mechanical Aptitude Structural Mechanics and Materials Questions and Answers flashcards as text
Which material property describes the ability to absorb energy and plastically deform before fracturing?
Answer: Toughness
Toughness is the total energy a material can absorb before fracture, represented by the area under the stress-strain curve and combining both strength and ductility.
A brittle material under overload will typically:
Answer: Fracture suddenly with very little plastic deformation
Brittle materials fracture abruptly with minimal plastic deformation once the applied stress reaches their fracture strength.
Material hardness is defined as resistance to:
Answer: Localized surface indentation or scratching
Hardness measures a material's resistance to localized plastic deformation at its surface, commonly tested by pressing an indenter (Brinell, Rockwell, or Vickers tests).
Fatigue failure in a metal component is caused by:
Answer: Repeated cyclic stresses that gradually propagate microscopic cracks
Fatigue occurs when cyclic loading initiates tiny cracks that slowly propagate with each cycle, eventually causing sudden fracture at stress levels well below the static yield strength.
Poisson's ratio for a material describes:
Answer: The ratio of lateral (transverse) strain to axial strain
Poisson's ratio ν = −(lateral strain / axial strain); when a material is stretched it typically narrows, and this ratio quantifies that relationship.
The annealing heat treatment process involves:
Answer: Heating to a specific temperature followed by slow cooling to relieve stress and improve ductility
Annealing heats metal to relieve internal residual stresses, then cools it slowly to restore ductility and reduce hardness, improving machinability.