材料科学与工程基础专业课模拟试题(A)

中北大学 材料科学与工程基础专业课模拟试题总分得分一、选择（10分，每题0.5分。）... The stimulus of electrical properties is .A: load B: force C: electric field D: magnetic field 2. consist of a polymer resin as the matrix, with fibers as the reinforcement medium.A: Polymer-matrix composites B: Metal-matrix compositesC: Ceramic-matrix composites D: Carboncarbon composites3. relates to the arrangement of its internal components. A: property B: structure C: processing D: application 4. are very thin single crystals that have extremely large length-to-diameter ratios.A: Fibers B: Wires C: Particles D: Whiskers5. Atomic packing factor of HCP structure is . A: 0.68 B: 0.34 C: 0.74 D: 0.566. has the sodium chloride crystal structure. A: CsBr B: CsI C: ZrO2 D: MgO7. Most glass-forming operations are carried out within the working rangebetween the and softening temperatures. A: melting; working B: softening; annealingC: working; softening D: annealing; strain 8. Hydrocarbons are composed of and . The intramolecular bonds are covalent. A: hydrogen; carbon B: oxygen; carbonC: hydrogen; oxygen D: carbon; nitrogen9. consists of passing a piece of metal between two rolls. A: Forging B: Extrusion C: Casting D: Rolling10. A load produces an elongation and positive linear strain. A: Compressive B: Shear C: Torsional D: Tensile11. is based on the weight fraction of molecules within the various size ranges. A: Number-average molecular weight B: Weight-average molecular weightC: Z-average molecular weight D: Viscosity-average molecular weight12. For many metals and other alloys, Poissons ratio is in . A: 0.10.2 B: 0.250.35 C: 0.450.55 D: 0.60.713. can be given either as percent elongation or area reduction. A: Ductility B: Resilience C: Toughness D: Tensile strength14. may be thought of as stiffness. A: Youngs modulus B: Tensile strength C: Shear modulus D: Compressive strength15. The corresponds to the temperature at which the viscosity is 4106Pas. A: melting point B: working point C: softening point D: annealing point16. The coordination number of sodium chloride crystal structure is . A: 2 B: 4 C: 6 D: 817. Addition polymerization is used in the synthesis of . A: phenolformaldehyde B: polyvinyl chloride C: the thermosetting polyesters D: polycarbonates18. For FCC structure, a total of atoms are assigned to a given unit cell. A: four B: two C: six D: eight19. The thermal behavior of solids can be represented in terms of . A: heat capacity B: electrical conductivity C: dielectric constant D: elastic modulus 20. is the point of the initial departure from linearity of the stress-strain curve. A: Yielding strength B: Tensile strength C: Proportional limit D: Shear strength得分二、名词解释（20分，每题4分）1.Mer 2.Yield strength: 3.vitrification4.Composite5. Processing得分三、简答题（30分，1，2，3必做题，每题7分；4，5，6选做其中之一， 9分）4. Make comparisons of thermoplastic and thermosetting polymers (a) on the basis of mechanical characteristics upon heating, and (b) according to possible molecular structures.5. What is the difference between graphite structure and diamond structure？得分四、计算题（40分，每题10分）1. Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute (1) the volume of a unit cell and (2) its density.2. A specimen of aluminum having a rectangular cross section 10 mm12.7 mm and 70mm long is pulled in tension with 35,500 N forces, producing only elastic deformation. Calculate the resulting strain and elongation.3. For a bronze alloy, the stress at which plastic deformation begins is 275 MPa, and the modulus of elasticity is 115 GPa.(a) What is the maximum load that may be applied to a specimen with a cross-sectional area of 325mm2 without plastic deformation?(b) If the original specimen length is 115 mm, what is the maximum length to which it may be stretched without causing plastic deformation?4. The number-average molecular weight of a polypropy