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Posted By: rajesh Member Level: Gold Posted Date: 30 May 2008
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2005 University of Mumbai(Bombay) B.E Applied Science II University Question paper
Applied Science II
November 2005 (Revised Course)
Section I - (Marks: 50)
N.B. (1) Question No. 1 is compulsory.
(2) Answer any four questions from remaining six questions.
(3) Assume suitable data whenever required.
(4) Figures to the right indicate full marks.
(5) Illustrate your answer with sketches wherever necessary.
1. (a) Calculate the least width that grating must have to resolve the components of Sodium D
lines in the second order, the grating having 1000 lines/cm. D1 = 5896 A° and D2 = 5890 A°. (5)
(b) In Newton's rings experiment, the diameter of a certain bright ring is 0.65 cm and that
of tenth ring beyond it is 0.95 cm. If wavelength of the source used is 6000 A°,
calculate the radius of curvature of a convex lens surface in contact with the glass plate. (5)
2 (a) Describe the process of obtaining a three dimensional image by the holography method. .(5)
(b) When a slow neutron is captured by U235 nucleus, fission results in the release of 200 MeV energy.
If the output power of a nuclear reactor is 1.6 mW, calculate the number of Nuclei undergoing
fission per sec. .(5)
3. (a) Discuss the phenomenon of Fraunhofer diffraction at single slit and obtain condition for
first minimum in the pattern. .(5)
(b) In thermonuclear reaction 1.09 x 10 -3 kg of hydrogen is converted in to 0-983 x 10 -3 kg of helium. .(5)
(i) Calculate energy released in joules.
(ii) If the efficiency of the generator is 5%, calculate the electrical energy output in kWH.
4. (a) Derive the expression for Numerical Aperature for fibre optics cable.
What do you understand by acceptance angle and what is it's significance ? .(5)
(b) If the p.d. applied across an X-ray tube is 25 kV and current through is 10 mA,
calculate no. of electrons striking the target per second and minimum
wavelength limit for the X-ray generated. .(5)
5. Write short note on (any two): 10
(a) G.M.Tube (c) Nuclear Chain Reaction.
(£) Mass defect and binding energy
6. (a) A wedge-shaped airjilm, having an angle of 45 seconds, is illuminated by monochromatic
light and fringes are observed vertically through a microscope. The distance measured
between the consecutive film is 0.12 cm. Calculate the wavelength of light used. 5
(b) The atomic mass of 8016 is 16 a.m.u. Find out binding energy per nucleon. 5
(Given: mass of Electron: 0-00055 a.m.u.)
mass of Proton : 1 -007593 a.m.u.)
mass of Neutron : 1 -008982 a.m.u.)
7. (a) What is laser action ? Explain the following terms with their specific importance in laser action: 5
(i) Optical pumping (Hi) Metastable state.
(ii) Population inversion
(b) Explain what is step, graded index, mono-mode, multimode fibre. 5
Section II - (Marks: 50)
N.B. (1) Question No. 1 is compulsory.
(2) From remaining five attempt any four questions.j
(3) All questions carry equal marks.
(4) Figures to the right indicate full marks.
1. Attempt any five from the following:— 10
(a) Name few characteristics of a good fuel.
(b) Give the composition and calorific value of Biogas.
(c) Give composition and uses of Duralumin.
(d) What are plane carbon steels ? How are they classified on the basis of carbon contents ?
(e) Distinguish between anodic and cathodic metallic coating.
(f) Give the classification of crude oil.
2. (a) What is corrosion ? Explain the corrosion due to combination of different metal electrodes.
4
(b) Write the composition, properties and uses of any two of the following : 6
(i) Germal Silver (ii) Type Metal (iii) Commercial Brass.
3. (a) Give a brief account of various types of coal. Write their composition and calorific value. 6
(b) Calculate the gross and net calorific value of coal having following composition: 4
C = 80%, H = 7%, O = 3%, S = 3-5%, N = 2-1 % and ash = 4-4%.
4. (a) What is cracking ? Distinguish between thermal and catalytic cracking. 4
(b) Explain the preparation of ethyl alcohol from sugarcane. 6
5. (a) Write short note on any two of the following : 6
? Cathodic protection by impressed current
? Water line corrosion
? Special Steels.
(b). A sample of coal containing 5% H2 when allowed to undergo combustion in
bomb calorimeter, the following data were obtained:- 4
(i) Wt. of coal burnt = 0.95 gm
(ii) Wt. of water taken = 700 gm
Water equivalent of bomb and calorimeter=2000gm
(iii) Rise in temperature = 2.48°C
(iv) Cooling correction = 0.02°C
(v) Fuse wire correction = 10.00 Cal
(vi) Acid Correction = 60.00 Cal
Calculate gross and net calorific value of coal.
6. (a) What are the main constituents of paint ? Write their functions. 4
(b) A gas has the following composition by volume H2 = 20%, CH4 = 6%, CO = 22%,
C02 = 4%, 02 = 4% and N2 = 44%. Find the volume of air actually supplied
perm3 of this gas.
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