Sree Narayana Guru College of Engineering and Technology 2005 ENGINEERING PHYSICS(For ECE,CSE and EEE) , Second series test - - Question Paper

Sree Narayana Guru College of Engineering and Technology, Payyanur
Second series test - April 2005

ENGINEERING PHYSICS
(For ECE,CSE and EEE)

Time: 2Hours Marks: 50

Part A: ans all ques.


1 explain the applications of laser
2 explain the signal distortion in optical fibres
3 discuss Avalanche breakdown and Zener breakdown
4 For Copper at 1000K, obtain the energy at which the probability P(E) that a conduction electron state will be occupied is 0.90
(4x5=20)

Part B: ans 3 ques.


5 (a) With a neat energy level diagram, discuss the mechanism of He-Ne laser
(b) compute the refractive indices of the core and cladding material for an optical fiber with the subsequent data:
NA=0.22 D=0.012
OR

6 (a) With a neat energy level diagram, discuss the mechanism of Ruby laser
(b) A step index fiber has the subsequent parameters: n1=1.68 n2=1.44 compute the critical angle, maximum angle of refraction, NA and acceptance angle

7 (a) discuss the method of recording a hologram
(b) Write notes on isotope effect and Meissner effect

OR

8 (a) discuss the reconstruction of image in holography
(b) explain the salient features of BCS theory of superconductivity


9 discuss with the energy band diagrams, the classification of solids into metals, semiconductors and insulators.

OR

10 Write notes on the following:
(a) Semiconductor laser
(b) Light propagation in optical fibres

Earning:   Approval pending.