5) Polycrystalline materials are stronger than their single crystal equivalent because:[] geometrical constraints are imposed on grains during deformation] the mechanical integrity of the grains is not maintainedI the shape of the grain it may assume that it is not affected by neighboring grains6) A large substitutional atom imposes:[ ] Compressive strains[ ] Tensile strains in the vicinity.7) The resistance to slip is greater when impurity atoms are present:[] because the lattice strain must increase if dislocation is torn away from them[ ] because the lattice strain must decrease if the dislocation is torn away8) Increase amount of cold work:[ ] Increases the rate of re-crystallization[ ] Has no effect[ ] Decreases the rate of re-crystallization9) Based on the atomic bonding:[]The modulus of elasticity of ceramics is higher than that of metal[]The modulus of elasticity of metal is higher than that of ceramics

These are based on metallurgy. Many properties of metals and alloys vary depend on its concentration…

5) Polycrystalline materials are stronger than their single crystal equivalent because: ] geometrical constraints are imposed on grains during deformation ] the mechanical integrity of the grains is not maintained ] the shape of the grain it may assume that it is not affected by neighboring grains 6) A large substitutional atom imposes: ] Compressive strains 7) The resistance to slip is greater when impurity atoms are present: [ ] Tensile strains in the vicinity. [ ] because the lattice strain must increase if dislocation is torn away from them [] because the lattice strain must decrease if the dislocation is torn away 8) Increase amount of cold work: [ ]Increases the rate of re-crystallization [ ] Has no effect [ ] Decreases the rate of re-crystallization 9) Based on the atomic bonding: [ ]The modulus of elasticity of ceramics is higher than that of metal 1 The modulus of elasticity of metal is higher than that of ceranmics

5) Polycrystalline materials are stronger than their single crystal equivalent because: ] geometrical constraints are imposed on grains during deformation ] the mechanical integrity of the grains is not maintained ] the shape of the grain it may assume that it is not affected by neighboring grains 6) A large substitutional atom imposes: ] Compressive strains 7) The resistance to slip is greater when impurity atoms are present: [ ] Tensile strains in the vicinity. [ ] because the lattice strain must increase if dislocation is torn away from them [] because the lattice strain must decrease if the dislocation is torn away 8) Increase amount of cold work: [ ]Increases the rate of re-crystallization [ ] Has no effect [ ] Decreases the rate of re-crystallization 9) Based on the atomic bonding: [ ]The modulus of elasticity of ceramics is higher than that of metal 1 The modulus of elasticity of metal is higher than that of ceranmics

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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