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Tuesday, 14 August 2012

Electromagnetic field theory- MSc/PhD model question paper

1(a) What is the basic difference between circuit and field theory? (6Marks)
(b) State and Prove Stokes’ theorem. (6 Marks)
(c) Discuss properties of Dirac-Delta function. (4 Marks)
(d) Given f = xy + yz + xz. Find gradient at (1,2,3) and the directional derivative of f at some point in direction towards the point (3,4,4). (4 Marks)
2 (a) Lines of force and flux can’t cross each other over a single point. Explain. (4 Marks)
(b) Discuss superposition principle with reference to electric potential function. (4 Marks)
(c) Derive expression for field inside parallel plate capacitor. (6 Marks)
(d) The point charges -2 nC, 4 nC and 2 nC are located at (0,0,0), (0,0,1) and (1,0,0) respectively. Find the enrgy in system. (6 Marks)
3 (a) Derive Ampere’s law in differential vector form. (6 Marks)
(b) State and explain Biot-Savart law. (4 Marks)
(c) Relate displacement current and conduction current. (6 Marks)
(d) The toroidal core has r0 = 20 cm and a circular cross section with a = 0.5 cm. If core is made of steel (m = 1000 m0) and has a coil with 100 turns, calculate the amount of current that will produce a flux of 1 mWb in core. (4 Marks)
4 (a) Write Maxwell’s equations in differential and integral form. Explain physical significance. (12 Marks)
(b) Rewrite Maxwell’s equations for harmonically varying field. (4 Marks)
(c) An ac voltage source v = V0 sinwt is connected across a parallel plate capacitor C. Verify that the displacement current in capacitor is same as conduction current wires. (4 Marks)
5 (a) Derive expression for intrinsic impedance. (6 Marks)
(b) Give expressions for circular and elliptical polarization. (6 Marks)
(c) What are Helmholtz equations? (4 Marks)
(d) A parallel polarized wave propagates from air to dielectric at Brewster angle of 8.50. Calculate relative dielectric constant of medium.  (4 Marks)
6 (a) explain the wave propagation in good dielectrics. (6 Marks)
(b) Derive conditions for horizontal and vertical polarization. (6 Marks)
(c) Derive expression for Poynting’s theorem. (4 Marks)
(d) Find skin depth S at frequency of 1.8 MHz in aluminium, where s = 34 MS/m and mr = 1. Also find propagation constant and wave velocity. (4 Marks)
7 (a) explain the characteristics of various types of transmission lines. (6 Marks)
(b) Define artificial lines. What are the applications of artificial lines. (6 Marks)
(c) Obtain expressions for reflection factor and reflection loss. (4 Marks)
(d) A 100 W line feeding the antenna has SWR = 2 and the distance from load to the first minima is 10 cm. Design a single stub matching to make SWR = 1. Given f = 150 MHz.(4 Marks)
8 (a) Discuss types of Bridged T equalizers. (6 Marks)
(b) What is the need of attenuator over a line? (4 Marks)
(c) Write a note on different types of variable attenuators. (6 Marks)
(d) An air line has a characteristic impedance of 75 W and a phase constant of 4 rad/m at 200 MHz.  Calculate the inductance per meter and capacitance per meter of line. (4 Marks)

Molecular structure and spectroscopy-MSc/PhD model question paper

1(a) What are the different types of energies possessed by a molecule? Why the translational energy of a molecule is not quantized?   (4 Marks)
(b) Write a note on dipole transitions. (4 Marks)
(c) Explain Hund’s rule with examples. (6 Marks)
(d) A gas consisting of B2 molecules is found to be paramagnetic. What pattern of molecular orbitals must apply in this case? (6 Marks)
2 (a) Distinguish between proper and improper rotations. (6 Marks)
(b) State and explain the great orthogonality theorem. (6 Marks)
(c) Explain how the infrared activity of a vibrational mode is determined? (4 Marks)
(d) What symmetry in SF6 molecule is equivalent to C4(z) C2(x)? (4 Marks)
3 (a) What is centrifugal distortion? Explain the effect of centrifugal distortion on the moment of inertia and energy of a diatomic molecule. (8 Marks)
(b) Outline the importance of the study of quadrupole hyperfine interaction in microwave spectra. (8 Marks)
(c) Determine the revolutions per second by a CO molecule when J=3. The CO bond length is 0.1131 nm. (4 Marks)
4 (a) Explain the effect of anharmonicity on the vibrational spectra of diatomic molecules. (8 Marks)
(b) Explain in detail the mull and pellet techniques used for the recording of IR specta. (8 Marks)
(c) One of the fundamental vibration modes of H2O occurs at 3652cm-1. What would be the frequency of the corresponding mode in D2O? (4 Marks)
5(a) Explain mutual exclusion principle with example. (6 Marks)
(b) Why anti-Stokes lines are less intense than stokes line? (4 Marks)
(c) Outline the advantages of surface enhanced Raman scattering over normal Raman scattering. (6 Marks)
(d) The Raman line associated with a vibrational mode which is both Raman and infrared active is found at 4600Å when excited by light of wavelength 4358 Å. Calculate the wavelength of the corresponding infrared band. (4 Marks)
6 (a) State and Explain Frank-Condon principle. (6 Marks)
(b) What is predissociation? How would you account for it? (6 Marks)
(c) Explain the method of estimation of orbital energies of molecules by photoelectron spectroscopy. (4 Marks)
(d) When 40.81 eV radiation is used to produce photoelectron spectra of neon, photoelectrons of kinetic energy 19 eV have been emitted. Evaluate the ionization energy of these electrons in kJ/mol.  (4 Marks)
7 (a) Distinguish between spin lattice and spin-spin relaxations. (6 Marks)
(b) The ESR spectrum of an unpaired electron interacting with two equivalent protons shows three lines with intensities 1:2:1. Why? (6 Marks)
(c) Explain the principle of nuclear quadrupole resonance. (4 Marks)
(d)A free electron is placed in a magnetic field of strength 1.3 T. calculate the resonance frequency if g=2.0023. (4 Marks)
8 (a) What is isomer shift? Explain with examples. (4 Marks)
(b) How crystal symmetry is understood using Mössbauer studies? (6 Marks)
(c) Outline the principle of Doppler free two-photon spectroscopy. (6 Marks)
(d) A Mossbauer nucleus 57Fe makes the transition from the excited state of energy 14.4 keV to the ground state. What is its recoil velocity? (4 Marks)

Monday, 13 August 2012

Total Quality Management – For B.E/B.Tech Mechanical engineering

1(a) Write a note on various stages of inspection and inspection procedures. (8 Marks)
(b)What is statistical quality control? (4 Marks)
(c) Explain some properties of probability and probability functions. (4 Marks)
(d) A random sample is to be selected from a lot of 15 articles, 4 of which are non-confirming. What is the probability that the sample will contaibn less than 3 non-containing items? (4 Marks).
2(a) Explain Deming’s philosophy. (8 Marks)
(b) Write a note on history of quality control in India. (8 Marks)
(c) Write a note on TQM organization. (4 Marks)
3 (a) With the help of figures, explain PDSA cycle and CPI cycle. (10 Marks)
(b) Explain in detail six sigma breakthrough methodology of quality improvement. (6 Marks)
(c)Mention some characteristics of successful leaders. (4 Marks)
4(a) Write a note on misconception about benchmarking. (4 Marks)
(b) What are benchmarking errors? Explain. (6 Marks)
(c) Explain the various steps involved in FMEA documentation. (6 Marks)
(d) Mention the drawbacks of quality function deployment. (4 Marks)
5 (a) State and explain central limit theorem. (6 Marks)
(b) What is process capability? (6 Marks)
(c) A product has a specification of 48±3 on one of its quality characteristic. Assume a normal distribution. What would be process average and standard deviation if the specifications have to fall exactly at X1±3s1. Assuming the process capabilities meet the values established in. What would be the 3s control limits for monitoring this characteristic for X, R chart using a subgroup size of 4. (8 Marks)
6 (a) What is an attribute control chart? Differentiate between p-chart and np-chart. (12 Marks)
(b) Write a note on Type I errors and type II errors with respect to the control charts. (4 Marks)
(c) A control chart for defects per units (U) uses the probability limits corresponding to the probabilities of 0.95 and 0.55. At Ū = 1.5, the limits vary with the value of n. Determine the correct position of UCL and LCL when the sample size in 6=8.   (4 Marks)
7(a) Explain operating characteristic curve. Differentiate between type A and type B curves. (6 Marks)
(b) Write a note on sequential sampling plan. (6 Marks)
(c) Explain the terms average outgoing quality (AOQ) and average outgoing quality limit (AOQL). (4 Marks)
(d) A double sampling plan is as follows: N= 5000 n1= 150 c1 = 3  r1=6  n2=200 c2=8 r2=9 100P’=1.5 P’=0.015. Calculate Pa, ATI, AOQ and ASN.     (4 Marks)
8 (a) Explaion the terms reliability and redundancy. (6 Marks)
(b) Write a note on tolerance design. (4 Marks)
(c) Explain two methods adopted for the evaluation of quality loss. (6 Marks)
(d) Determine the reliability of an equipment having an MTBF of 50 hours for an operating period of 45 hours. If the reliability has to be improved by 20%, what % change in MTBF is required?        (4 Marks)

Wednesday, 1 August 2012

Nanomaterials-MSc/PhD model question paper

1(a) What are nanomaterials. Distinguish between quantum dots and quantum wires. (10 Marks)
(b) Write a note on sol gel process of nanomaterial synthesis. (06 Marks)
(c) Draw and explain nucleation and growth curve. (04 Marks)
2 (a) Distinguish between semiconductor nanoparticles and metal nanoparticles. (08 Marks)
(b) Write a note on magnetic properties of magnetite nanoparticles. (06 Marks)
(c) What are magnetic nanofluids? Mention some applications. (06 Marks)
3 (a) Explain how fluorescent nanoparticles are used in biosensors and biolabelling? (08 Marks)
(b) Explain in detail drug delivery by nanoparticles. (08 Marks)
(c) What are nanosomes? Explain. (04 Marks)
4 (a) Write a note on artificial implants by nanotechnology. (06 Marks)
(b) Explain quantum information processing. (06 Marks)
(c) Write a note on smart dust. (08 Marks)
5 (a) What are organic nano crystal solar cells? (04 Marks)
(b) Mention some nanomaterials used for hydrogen production and conversion. (04 Marks)
(c) Write a detailed note on application of nanotechnology in environment protection (08 Marks)
(d) How nanoparticles are helpful in barcoding? (04 Marks)
6 (a) Explain the use of nanotechnology in space research. (10 Marks)
(b) Write a note on CNT based nanosensors. (06 Marks)
(c) Write a note on Nanosized GMR materials. (04 Marks)
7 (a) How are nanomaterials used in fuel cells? (06 Marks)
(b) Write a note on surface Plasmon resonance. (04 Marks)
(c) Write a note on polymer based nanocomposites. (06 Marks)
(d) Explain how ceramic nanocomposites are used in solving problem of fracture failures. (04 Marks)
8 (a) Write a note on impact of nanomaterials in catalysis. (06 marks)
(b) Explain any two methods for the preparation of supported metal nanoparticles. (08 Marks)
(c) Explain with the help of a figure, working of enzyme based biofuel cells. (06 Marks)