Engineering Materials

Choose the correct option:

The ability of a material to resist plastic deformation is known as

(i) Tensile Strength
(ii) Modulus of Elasticity
(iii) Yield Strength
(iv) Impact Strength

Choose the correct option:

In a standard tensile test on a ductile metal, Young's modulus is obtained from:

(i) The entire stress-strain curve up to fracture
(ii) The slope of the initial linear portion of the engineering stress-strain curve
(iii) The maximum load divided by original area
(iv) The slope of the plastic region of the true stress-strain curve

Choose the correct option:

Which statement about hardness testing is most appropriate for steels?

(i) Rockwell hardness directly gives Young's modulus
(ii) Brinell hardness can be empirically related to ultimate tensile strength
(iii) Vickers hardness is expressed in HRC units
(iv) Hardness tests are unrelated to strength

Explain how Young's modulus is obtained from the stress-strain curve and discuss the physical meaning of the linear elastic region.

Explain the Rockwell hardness test and compare B-scale with C-scale.

Explain the concept and objectives of non-destructive testing (NDT) and contrast it with destructive mechanical testing.

Explain the difference between toughness and brittleness.

Explain ultrasonic testing with a neat sketch.

Explain the following: Creep