University of Mumbai 2007-2nd Sem B.E FE Applied Science II - Question Paper
(3 Hours) [ Total Marks :
N.B. (1) Question No. .1 is compulsory from Section I.
(2) Attempt any two questions from Question Nos. 2 to 5.
(3) Attempt both the sections in separate answer-books.
(4) Assume suitable data and symbols if required.
(5) Figures to the right indicate full marks.
SECTION I _
1. Attempt any four
(a)
any iwur : ' / -v v 5
Explain in short %
What will be the Newton's Rings pattern like, if the
(i) white light replaces monochromatic light ?
(ii) when planoconvex lens of larger Radii of curvature (R) is used ?
(iii) when a transparent liquid (ji) is placed between planoconvex lens and the glass plate (|.i2) such that < (i2.
(b) Calculate the energy released in KWh by 700 gm U235 undergoing fission. 5 Q = 200 MeV per fission. Avagadro's No. N = 6-025 x 1023/gm mole.
(c) What is the difference between step index and graded index fibre ? 5 <d) What is (i) stimulated emission, (ii) population inversion and (iii) pumping method 5
in lasers ?
(e) A slit of width a1 is illuminated by white light. For what value of 'a' will the 1st 5 minimum for red light fall at an angle of 30 ? Wavelength of red light is 6500 A.
(f) In comparing the wavelengths of two monochromatic X-ray lines, it is found that 5 line A gives a 1st order Bragg reflection maximum at a glancing angle of 30 to the smooth face of a crystal. Line B of known wavelength of 0-97 A gives a 3rd order reflection maximum at a glancing angle of 60 with the same face of the same crystal, Find the wavelength of the line A.
2. (a) What are characteristic X-rays of an element ? How can they be used to determine 8
the atomic no. of an element ? Examine the formation of Lp X-rays.
(b) Derive the expression for Numerical Aperture of fibre optic cable. What is acceptance 7 angle ? The numberioal aperture of an optical fibre is 0*5 and core refractive index is 1 -54. Find R.l. of the cladding.
3. (a) Obtain the condition for maxima and minima of the light reflected from a thin transparent 8
film of uniform thickness. Why is the visibility of the fringe much higher in the reflected system than in the transparent system ?
(b) Explain the construction and working of He-Ne Laser with neat energy level diagram. 7
4. (a) Discuss the phenomenon of Fraunhoffers diffraction at single slit and obtain the 8
condition for 1st minimum. A plane transmission grating having 3000 lines per cm give an angle of diffraction of a spectral line of 30 in 3rd order. Find the wavelength of the given line.
(b) The bombardment of gLi1 at rest by proton produces two alpha particles per reaction. 7 If the energy of each a particle per reaction is 10 MeV, then write the reaction and calculate the energy of the bombarding proton. Give that :
Mass of Li = 7-018232 a.m.u.
Mass of particle = 4-003874 a.m.u.
Mass of proton = 1*008143 a.m.u.
1 a.m.u. = 931 MeV.
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SECTION II
N.B. (1) Question No. 6 is compulsory.
(2) Attempt any two questions from remaining three.
6. Attempt any five from the following : 20
(a) What is cracking ? Why catalytic cracking is superiour than thermal cracking ?
(b) What is meant by octane number ? Explain the role of antiknocking agents.
(c) 1 -56 gm of the coal was Kjeldahlized and NH3 gas thus evolved was absorbed in 50-0 ml of 0-1 N H2S04. After absorption the excess (residual) acid required 6-25 ml of 0-1 N NaOH for exact neutralization. 2-60 gm of the coal sample in a qualitative analysis gave 0*1755 gm of BaS04. Calculate the percentage of N and S in the coal sample.
(d) Distinguish between Galvanizing and Tinning.
(e) Explain the pitting corrosion with relevant equation.
(f) What are alloys ? What are the purposes of making alloy ?
(g) Explain the scope and importance of biotechnology in medicine.
7. (a) Describe the refining of petroleum with various fractions obtained.
(b) Write short note on :
(i) Cathodic protection
(ii) Stainless steel.
(c) What are plain carbon steel ? How are they classified on the basis of their carbon 2 content ?
8. (a) Write composition, properties and uses of the following : 6
(i) German Silver
(ii) Duralumin.
(b) Calculate the volume of air required for complete combustion of 1 m2 of gaseous 5 fuel which possess by volume :
CH4 = 35%, C2H4 = 5%, CO =15%,' H2 = 40%, Na = 1%, Water Vapour = 4%.
(c) Explain the following factors influencing the rate of corrosion : 4
(i) Relative area of cathode and anode
(ii) pH of medium.
(c) Holography
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