Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Production Engineering I Supplementary s, ember- ENGINEERING PHYSICS - university paper

Code No.NR-10153
I B.Tech. Supplementary Examinations, November-2003

ENGINEERING PHYSICS
(Common to Civil Engineering, Mechanical Engineering, Aeronautical Engineering, Chemical Engineering, Production Engineering, Mechatronics Metallurgy and Material Technology)
Time: three hours Max.Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1.a) Describe with examples the kinds of waves.
b) Derive an expression for the speed of sound waves in a gaseous medium.
c) If a violin string is tuned to a certain note, by how much must the tension in the string be increased if it is to emit a note of double the original frequency?

2.a) State the difference ranging from the ‘o-ray’ and ‘e-ray’ in the phenomenon of ‘double refraction’ and hence discuss how a beam of ‘circularly polarized light’ can be obtained.
b) Calculate the thickness of a calcite crystal to act as a quarter wave plate for light of wavelength 560 nm, if its refractive indices for the o-ray and the e-ray are 1.648 and 1.486 respectively.

3.a) Describe the construction and working of a Ruby laser.
b) What is meant by acceptance angle for an optical fiber? Show how it is related to numerical aperture.

4.a) Explain in detail the terms: (i) Space lattice (ii) Unit cell
(iii) Coordination number and (iv) Miller indices.
b) Show that the face centered cubic structure possesses maximum packing density among cubic structures.
c) Draw the (112) and (120) planes, and the [112] and [120] directions of a simple cubic crystal.

5.a) Describe and explain the salient features of free-electron theory of metals. find the expressions for Fermi energy and electronic specific heat.
b) Distinguish ranging from a super-conductor and a normal metal, both maintained at same temperature.

6.a) Explain the terms (i) Magnetic induction (ii) Magnetic susceptibility
(iii) Permeability of a medium and (iv) Intensity of magnetization.
b) A magnetic material has a magnetization of 3300 amp/m, and flux density of 0.0044 weber/sq.m. compute the magnetizing force and the relative permeability of the material.
7.a) What is meant by polarization of a dielectric material? Mention the various mechanisms of polarization in a dielectric.
b) How ferroelectrics are various from ordinary dielectrics.

8. Write short notes on any 3 of the following:
(a) Fraunhoffer diffraction at a single slit
(b) Type-I and Type-II superconductors
(c) Holography and its applications
(d) Bravais two-dimensional lattices
(e) Hard and Soft magnetic materials.

Earning:   Approval pending.