Sree Narayana Guru College of Engineering and Technology 2006 ENGINEERING PHYSICS (for ME), Second series test - - Question Paper

Second series test - April 2006

ENGINEERING PHYSICS
(For ME)

Time: 2Hours Marks: 50

Part A: ans all ques.


1 State and derive Bragg’s legal regulations of X-ray diffraction.
2 elaborate ultrasonics? How they are detected?
3 discuss the importance of reverberation time in good acoustics.
4 elaborate semiconductors? Distinguish ranging from p-type and n-type semiconductors.
5 Write a note on BCS theory of superconductivity
(5x4=20 Marks)


Part B: ans 3 ques.


6 (a) Derive Sabine’s formula for standard time of reverberation.
(b) Write a note on nondestructive testing by ultrasonic method.

OR

7 (a) explain piezo electric method of producing ultrasonic waves.
(b) Write a note on radiographic method of nondestructive testing


8 (a) define p-n junction and discuss the effect of forward and reverse biasing on the barrier potential of the function.
(b) The 1st order spectrum is formed when X-rays of wavelength 1.5Å is incident on a crystal at 12Å. compute the interplanar spacing of the crystal

OR

9 (a) discuss with energy band diagram the classification of solids into metals, semiconductors and insulators
(b) obtain the different possible orders of reflection from a crystal whose lattice constant is 1.4Å. The wavelength of X-ray beam is 1.26Å.


10 (a) provide an account of different breakdown mechanisms.
(b) Write a note on Meissner effect.

OR

11 (a) Write a note on photodiode.
(b) Distinguish ranging from typeI and typeII superconductors

Earning:   Approval pending.