10. The following questions (1-40) each carry one mark for a correct answer and

Question

10. The following questions (1-40) each carry one mark for a correct answer and mius one-third of a mark for an incorrect answer A material which exhibits a fatigue limit: a) Suffers from microvoid coalescence b) Has a limited resistance to fatigue failure c) Will always fail, no matter what the stress amplitude, given sufficient time Will never fail, given a sufficiently low applied stress amplitude 1. Stress is defined as d) a) Force divided by extension b) Force divided by cross-sectional arca c) Extension divided by original length d) Extension divided by cross-sectional area Toughness is the ability of a material to resist: a) Wear b) Indentation c) Brittle fracture d) Scratching. 1. The planes in the Figure 2 have the Miller indices: a) (32) 2. d) (43) 3. The toughness of a material is measured using a: a) Vickers test b) Charpy test c Wöhler test d) Rockwell test. 4. Poisson's ratio is a measure of a material's a) Elongation before failure b) Resistance to shock loading c) Lateral shrinkage in response to a tensile d) Wear resistance A 120° diamond brale is used in which test: a) Vickers b) Brinel c) Rockwell A d) Knoop 5. Figure 2 12. The planes in Figure 3 have the Miller indices: a) (23) b) (13) c) (32) d) (21) 6, Young's modulus is a measure of a material's resistance to: a) Elastic deformation under tension b) Plastic deformation under tension c) Elastic deformation under hydrostatic stress d) Shear deformation under sliding. 7. Creep results in the failure of a component due to: aElastic shear at any temperature b) Repeated cyclic loading at room temperature c Shock loading at low temperatures d) Plastic deformation at high temperatures. Shear stress is the stress state found in: 8. A fish underwater a) b) The wall of a box-spanner when tightening a c) A column supporting the roof of a building d) The skin of an inflated balloon Figure 3 9. The energy associated with deformation is proportional to: a) The area under the stress-strain curve b) The hardness of the material c) The yield strength of the material d) The tensile ductility of the material.

Explanation / Answer

1) B . Stress is defined as resistive force per unit area.

2). C For a material to be tough it should have to absorb energy by plastically deforming itself without brittle fracture.

3). B. Charpy and izod tests are used.

4). C. It is the ratio of lateral strain to the linear strain

5) C Rockwell test

6) A

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