1. What is an atom 72. Explain briefly the followings:(i) Unit cell(ii) Space lattice(iv) Crystallographic planes.(ii) Lattice parameters3. Discuss briefly the following structures for metallic elements:() Body centred cubic (BCC)(ii) Face centred cubic (FCC)(iii) Hexagon close-packed (HCP)4. What are Miller indices ? What is procedure for finding Miller indices?5. Discuss important features of Miller indices.6. How are crystallographic defect classified ?7. Explain briefly the following point defects :(1) Vacancy(ii) Schottky imperfections(iv) Frenkel defect.(ii) Interstitialcy8. Describe briefly the following line defects (disilocations) :(1) Edge dislocations.(ii) Screw dislocations.9. What is Berger's vector ?10. Give the comparison between edge disloçation and screw dislocations.11. Discuss briefly the following :(1) Surface defects.(ii) Volume defects or three dimensional defects12. Explain briefly the following :() Theory of dislocations.(i) Role and significance of dislocation.apter three MECHANICAL PROPERTIESCn otol ore:.

Answered: 1. What is an atom ?

Engineering

Mechanical Engineering

1. What is an atom ?

Understanding Motor Controls

4th Edition

ISBN:9781337798686

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter44: Semiconductors

Section: Chapter Questions

Problem 4RQ

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Concept explainers

Engineering Drawing

Technical drawing has been around since ancient times. As in the ancient Renaissance, complicated drawings were created, including Leonardo da Vinci's drawing. Modern engineering drawing, including its specific orthographic projection with scale conventions, began in Europe (France) during the early stages of Industrialization. L.T. C. Rolt also made some of Marc's drawings for its block-making machinery (in 1799) that also may have contributed significantly to British engineering technology. Since he learned the art of presenting three-dimensional(3D) items in a two-dimensional(2D) plane, as we now term mechanical drawing. 

Question

1. What is an atom 7
2. Explain briefly the followings:
(i) Unit cell
(ii) Space lattice
(iv) Crystallographic planes.
(ii) Lattice parameters
3. Discuss briefly the following structures for metallic elements:
() Body centred cubic (BCC)
(ii) Face centred cubic (FCC)
(iii) Hexagon close-packed (HCP)
4. What are Miller indices ? What is procedure for finding Miller indices?
5. Discuss important features of Miller indices.
6. How are crystallographic defect classified ?
7. Explain briefly the following point defects :
(1) Vacancy
(ii) Schottky imperfections
(iv) Frenkel defect.
(ii) Interstitialcy
8. Describe briefly the following line defects (disilocations) :
(1) Edge dislocations.
(ii) Screw dislocations.
9. What is Berger's vector ?
10. Give the comparison between edge disloçation and screw dislocations.
11. Discuss briefly the following :
(1) Surface defects.
(ii) Volume defects or three dimensional defects
12. Explain briefly the following :
() Theory of dislocations.
(i) Role and significance of dislocation.
apter three MECHANICAL PROPERTIES
Cn otol ore:.

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