Physics of Electronics and Materials SATHYABAMA UNIVERSIT B.E B.Tech December 2014 Question Paper

Register Number

                               

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act,1956)

Course & Branch :B.E/B.Tech - CSE/E&C/ECE/EEE/EIE/ETCE/IT

Title of the Paper :Physics of Electronics & Materials Max. Marks:80

Sub. Code :6C0017(2008/2009)   Time : 3 Hours

Date :16/12/2014      Session :AN

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                                       PART - A   (10 x 2 = 20)

                        Answer ALL the Questions

1.     Write a note on AC Josephson effect      

2.     What will happen to transition temperature if the atomic weight is increased?

3.     Define electric flux

4.     What is meant by displacement current?

5.     Describe decimal number and Binary number?

6.     Convert the decimal number (775.224)₁₀ into octal umber.

7.     Define refractive index?

8.     What are meridional and skew rays?

9.     What is relative permeability (µ_r) of a medium?

10.   What is meant by local field or internal field?

                                     PART – B    (5 x 12 = 60)

Answer All the Questions

11.   (a) Define electrical and thermal conductivity and deduce the expressions for the same

        (b) Distinguish between Electrical and thermal conductivities.

(or)

12.   (a) Classify superconductors based on critical field

        (b) Give some applications of superconductors.   

13.   Derive the wave equations for a transverse electric and magnetic fields in free Space by using Maxwell’s equations.

(or)

14.   Derive an expression of Continuity equation by the principle of conservation of charge.

15.   (a) Explain gray code with its suitable example.

        (b) Convert the following      

        (i). (713)₈ into binary

        (ii) (713)₈ into decimal

        (iii) (713)₈ into hexadecimal.

(or)

16.   Write a short note on

        (a) ASCII and excess 3 code.

        (b) Using 1’s complement method, Subtract (0 1 1 0 1)₂ from

(1 1 0 1 1)₂

17.   Explain different types of loss that occur in the propagation of light through the optical fiber.

(or)

18.   (a) Explain the principle  behind the propagation of light through the fiber.

(b) List out the advantages of optical fiber communication over conventional communication.

19.   Discuss in detail the soft and hard magnetic materials.

(or)

20.   Derive the expression for internal or local electric field in dielectric materials.

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