AMIE INDIA Students Forum

[habeebrahmanv]

Sir, Pl send me the p/w of this book to hrvazhayil.191@rediffmail.com

[skyblue]

Dear habeebrahmanv,
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Komal

[rohit.wadhwa]

Dear Mr. Praveen,
I am preparing for Summer 2009 exams,Please send the password for downloading the material for Material science,
and i am newly join this forum,so also tell how i can download notes.
Because some time its show this message "You are not authorised to read this forum."

Please provide password for the Material Science study note on Rohit.Wadhwa@daffodildb.com
or Rohit.Wadhwa52@gmail.com
Thanks in advance.
Rohit Wadhwa

[skyblue]

Password has been sent as PM.

Komal

[praveen]

Hi rohit.wadhwa

Please get Super membership for downloading all available old question papers and Study notes.

[RANDEEP]

B.E/B.TECH. DEGREE EXAMINATION ,NOV/DEC 2006
Second semester ,EI
Material Science

Time: 3Hrs
Maximum:100 marks

PART A (10 X 2 =20)

1. What is the difference between the unit cell and the primitive cell of a crystal?

2.The lattice parameter of FCC aluminium is 4.05 Armstrong.Calculate the interplaner distance of (110) plane.

3. Define density of states of electrons.

4. What is called the effective mass of an electron?

5. Mention any two advantages of compound semiconductors over elemental semiconductors.

6. State the law of mass action for semiconductors.

7. List any two applictions of ferrites.

8. Differentiate active and passive dielectrics.

9. What are traps in optical materials?

10. Define photoconductivity.

PART B (5 X 16 =80)


11 (a) (i) Distinguish between different crystal system and related bravais lattices.

(ii) Explain all the symmetry elements of a cubic crystal.

OR

(b) Deduce the packing factor of a hcp crystal along wih its c/a ratio.


12 (a) (i) Outline the properties of fermi-Dirac distribution function.Using this function,obtain an expression for the Fermi energy of free electrons.

(ii) Briefly outline the origin of energy band gap in solids,

OR

(b) (i) Discuss hte properties of type-I and type -II super conductors.

(ii) Enumerate and outline any four applications of superconductors.

13 (a) (i) Derive an expression for the carrier concentration of a intrinsic semiconductor.

(ii) Obtain a temperature dependent equation for the Fermi energy of a semiconductor.

OR

(b) (i) Explain in detail the theory and an experimental procedure using Langevin's theory.

(ii) Outline the significance of hysterisis energy product with necessary diagram

OR

(b) Deduce an equation for the internal field of a dielectric medium.Hence obtain the Clausis -Mossotti equation.

15 (a) (i) Explain the fundamental energy transition processes of phosphorescence and fluorscence.

(ii)Discuss the production and applications of various colour centers in crystals

OR

(b) (i) Draw the biasing circuit of a photoconductor and derive an expression for the photoconductive gain of the device.

(ii) A smiconductor has an energy gap of 3.6 eV .Can orange light of wavelength 580 nm be used for photo conduction in the semiconductor? (velocity of light = 3X 10 ^ 8 m/s ;Plancks constant = 4.135 X 10 ^15 eV -sec)

[RANDEEP]

B.E/B.TECH. DEGREE EXAMINATION ,NOV/DEC 2006
Second semester ,EI
Material Science

Time: 3Hrs
Maximum:100 marks

PART A (10 X 2 =20)

1. What is the difference between the unit cell and the primitive cell of a crystal?

2.The lattice parameter of FCC aluminium is 4.05 Armstrong.Calculate the interplaner distance of (110) plane.

3. Define density of states of electrons.

4. What is called the effective mass of an electron?

5. Mention any two advantages of compound semiconductors over elemental semiconductors.

6. State the law of mass action for semiconductors.

7. List any two applictions of ferrites.

8. Differentiate active and passive dielectrics.

9. What are traps in optical materials?

10. Define photoconductivity.

PART B (5 X 16 =80)


11 (a) (i) Distinguish between different crystal system and related bravais lattices.

(ii) Explain all the symmetry elements of a cubic crystal.

OR

(b) Deduce the packing factor of a hcp crystal along wih its c/a ratio.


12 (a) (i) Outline the properties of fermi-Dirac distribution function.Using this function,obtain an expression for the Fermi energy of free electrons.

(ii) Briefly outline the origin of energy band gap in solids,

OR

(b) (i) Discuss hte properties of type-I and type -II super conductors.

(ii) Enumerate and outline any four applications of superconductors.

13 (a) (i) Derive an expression for the carrier concentration of a intrinsic semiconductor.

(ii) Obtain a temperature dependent equation for the Fermi energy of a semiconductor.

OR

(b) (i) Explain in detail the theory and an experimental procedure using Langevin's theory.

(ii) Outline the significance of hysterisis energy product with necessary diagram

OR

(b) Deduce an equation for the internal field of a dielectric medium.Hence obtain the Clausis -Mossotti equation.

15 (a) (i) Explain the fundamental energy transition processes of phosphorescence and fluorscence.

(ii)Discuss the production and applications of various colour centers in crystals

OR

(b) (i) Draw the biasing circuit of a photoconductor and derive an expression for the photoconductive gain of the device.

(ii) A smiconductor has an energy gap of 3.6 eV .Can orange light of wavelength 580 nm be used for photo conduction in the semiconductor? (velocity of light = 3X 10 ^ 8 m/s ;Plancks constant = 4.135 X 10 ^15 eV -sec)

[RIPU6464]

thanks for providing the notes will you plz send me the password for for this file on ripu6464@gmail.com

[skyblue]

Password has been sent to u as PM
KOmal

[DEBOBRATA DAS]

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