Exam Details
| Subject | engineering physics | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | December, 2017 | |
| City, State | telangana, hyderabad |
Question Paper
(AUTONOMOUS)
B. Tech I Semester Regular/Supplementary Examinations, December 2017
(Regulations: VCE-R15)
ENGINEERING PHYSICS
(Common to Electronics and Communication Engineering,
Mechanical Engineering Civil Engineering)
Date: 22 December, 2017
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
With a neat sketch, obtain an expression for interplanar spacing in terms of Miller indices for a cubic lattice.
6M
Does the Miller indices refer to a single plane or to the family of parallel planes? What interpretation is given to the Miller indices? A member of a family of planes cuts the a-axis, b-axis and c-axis at points Q and R respectively. If the origin of the axes is O and it is given that OB=b/2 and OC=c/4 where b and c are the axial lengths then what is the Miller indices for the plane?
9M
2.
What are the limitations of Bragg's law? Using a neat diagram explain the rotating crystal method of diffraction.
10M
Using X-rays of wavelength 1.54Å a first order diffraction maximum is obtained at an angle of 32.51° from a cubic crystal whose unit cell dimension is 3.51Å. What are the possible Miller indices of the set of planes from which this reflection is obtained?
5M
Unit II
3.
Describe Davisson-Germer's experiment and explain how it enabled verification of the deBroglie equation.
10M
A particle is confined to an infinite potential well of width calculate the probability of finding the particle between x=0 and in ground state.
5M
4.
Explain the working of an LED. What kinds of semiconductor materials are necessary for creation of LED?
7M
Explain the Fermi level in intrinsic and extrinsic semiconductors with energy band diagrams.
8M
Unit III
5.
What are nano materials? Discuss various properties of nano materials.
5M
Outline the procedure of the sol-gel method of synthesis of nano particles. What are the inherent advantages of this method?
10M
6.
Explain three distinguishing features of Ferroelectric materials.
9M
Write down the Claussius-Mosotti relation and explain its significance. A dielectric sample contains two species A and each of concentrations, 1028 and 3x1028/m3 respectively. If the polarizabilities of A and B are 10-40 and 2x10-40 respectively then what is the dielectric constant of the specimen.
6M
Unit IV
7.
Explain the different types of magnetic materials based on magnetic moment.
6M
Explain the hysteresis loop with B-H curve. What should be voltage required to introduce a material of dielectric constant 4 between the plates of a parallel plate capacitor of area 1000mm2 having plate separation of 5mm and a charge of 3x10-10 Also determine the applied electric field.
9M
Cont…2
2
8.
Describe the high temperature superconductivity with examples.
6M
Discuss the phenomenon of superconductivity and Meissner effect with example. Also explain the validity of Meissner effect in Type-I and Type-II superconductors.
9M
Unit V
9.
Show that the probability of stimulated emission is the same as the probability of absorption.
8M
What are the characteristics of laser beam? What is the ratio of populations of the two energy levels correspondence to the lasing wavelength of 694.3nm in ruby laser?
7M
10.
Using neatly labeled diagrams represent the trajectories of light rays in:
i. Step index
ii. Graded index optical fibers
6M
What is attenuation in optical fibers? Write an equation for the attenuation coefficient. Explain the extrinsic causes of attenuation of signals in optical fibers.
9M
B. Tech I Semester Regular/Supplementary Examinations, December 2017
(Regulations: VCE-R15)
ENGINEERING PHYSICS
(Common to Electronics and Communication Engineering,
Mechanical Engineering Civil Engineering)
Date: 22 December, 2017
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
With a neat sketch, obtain an expression for interplanar spacing in terms of Miller indices for a cubic lattice.
6M
Does the Miller indices refer to a single plane or to the family of parallel planes? What interpretation is given to the Miller indices? A member of a family of planes cuts the a-axis, b-axis and c-axis at points Q and R respectively. If the origin of the axes is O and it is given that OB=b/2 and OC=c/4 where b and c are the axial lengths then what is the Miller indices for the plane?
9M
2.
What are the limitations of Bragg's law? Using a neat diagram explain the rotating crystal method of diffraction.
10M
Using X-rays of wavelength 1.54Å a first order diffraction maximum is obtained at an angle of 32.51° from a cubic crystal whose unit cell dimension is 3.51Å. What are the possible Miller indices of the set of planes from which this reflection is obtained?
5M
Unit II
3.
Describe Davisson-Germer's experiment and explain how it enabled verification of the deBroglie equation.
10M
A particle is confined to an infinite potential well of width calculate the probability of finding the particle between x=0 and in ground state.
5M
4.
Explain the working of an LED. What kinds of semiconductor materials are necessary for creation of LED?
7M
Explain the Fermi level in intrinsic and extrinsic semiconductors with energy band diagrams.
8M
Unit III
5.
What are nano materials? Discuss various properties of nano materials.
5M
Outline the procedure of the sol-gel method of synthesis of nano particles. What are the inherent advantages of this method?
10M
6.
Explain three distinguishing features of Ferroelectric materials.
9M
Write down the Claussius-Mosotti relation and explain its significance. A dielectric sample contains two species A and each of concentrations, 1028 and 3x1028/m3 respectively. If the polarizabilities of A and B are 10-40 and 2x10-40 respectively then what is the dielectric constant of the specimen.
6M
Unit IV
7.
Explain the different types of magnetic materials based on magnetic moment.
6M
Explain the hysteresis loop with B-H curve. What should be voltage required to introduce a material of dielectric constant 4 between the plates of a parallel plate capacitor of area 1000mm2 having plate separation of 5mm and a charge of 3x10-10 Also determine the applied electric field.
9M
Cont…2
2
8.
Describe the high temperature superconductivity with examples.
6M
Discuss the phenomenon of superconductivity and Meissner effect with example. Also explain the validity of Meissner effect in Type-I and Type-II superconductors.
9M
Unit V
9.
Show that the probability of stimulated emission is the same as the probability of absorption.
8M
What are the characteristics of laser beam? What is the ratio of populations of the two energy levels correspondence to the lasing wavelength of 694.3nm in ruby laser?
7M
10.
Using neatly labeled diagrams represent the trajectories of light rays in:
i. Step index
ii. Graded index optical fibers
6M
What is attenuation in optical fibers? Write an equation for the attenuation coefficient. Explain the extrinsic causes of attenuation of signals in optical fibers.
9M
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