Vidyasagar University 10 Years Question

I am pursuing M.Com form Directorate of Distance Education - Vidyasagar University, Medinipur, West Bengal and looking for Previous 10 Years Question Papers of M.Com Part III for final preparation of exam so please provide me the same?

I want the question paper of Electronic Materials of M.Sc- 4th Sem of Vidyasagar University so will you provide me?

[pawan]

I am providing you the question paper of Electronic Materials of M.Sc- 4th Sem of Vidyasagar University

Vidyasagar University M.Sc- 4th Sem Electronic Materials question paper

Full Marks : 40

Time : 2 Hours

Illustrate the answers wherever necessary.

Answer Q. No. I and any three from the rest.

1. Answer any Five questions : 2 5

(a) Discuss the physical significance of Fermi Golden Rule.

(b) Amongst quantum dot and quantum wire lasers which one requires less threshold current and why ?

(c) Distinguish between graded gap and stair case APDs.

(d) Explain quasi-equilibrium condition of a semiconductor laser.

(e) Mention the essential difference between photo conduction and photoemission.

(i) Discuss the merits of MQW laser compared to QW laser.

2. (a) What do you mean by perturbation? What an degenerate and non-degenerate systems?

(b) In case of time independent perturbation aduce thi expression of nrst order perturbation in wave function In'), 5+5

3. (a) Expiain why microwave emission of stipulated type be obtained more easily than lasef emission.What are the advantages of NH3 MASER?

(b) Using time dependent perturbation theory explain the phenomena of absorption and emission. 2+3+5

(c) Discuss with a neat energy band diagram the mechanism of a semiconductor laser.

4. (a) What are the drawbacks in a homojuncuor semiconductor laser?

(b) We can get better optical confinement and lowel threshold current by introducing hetero-junction
Explain why ?

(c) DIscuss how threshold current can be reduced i2: quantum well.

5. (a) How that the density of state function in tw; dimension is inde-pendent of energy.

(b) Show graphically how density of staaes for quantum differs for' 'the bulk devices. 3+(5+2)

(c) how solid siate photo multiplication could be obiained in a super lattice APD.

6. (a) Compare p-n photodiode and pfien photodiode as regards their performance characteristics.

(b) MenUon different noises Iiresent in APDs. 5+3+2

Contact-

Vidyasagar University
Vidyasagar University Road, Rangamati, Medinipur, West Bengal 721102
03222 276 554

here I am looking for Vidyasagar University B.com previous Years Question paper so will you plz let me know from where I can do download its question paper ??

[sumit]

Vidyasagar University was established by an Act of the West Bengal legislature which was notified in the Calcutta Gazette on 24 June 1981

As you are asking for Vidyasagar University B.com previous Years Question paper so on your demand I am providing same here :

Vidyasagar University B.com previous Years Question paper
inet.vidyasagar.ac.in:8080/jspui/bitstream/123456789/4059/3/AH3.pdf

University Profile

Type Public

Established 1981

Founder Anil Kumar Gain

Chancellor Governor of West Bengal

Vice-Chancellor Professor (Dr.) Ranjan Chakrabarti

Location Midnapore, West Bengal, India

Campus Rural

Affiliations UGC; NAAC