2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper for exam preparation. Question paper for 2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper, 2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper. SiteMap
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2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper

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2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper
(APPLIED SCIENCES-l) (JUNE. 2004)
N.B.:
(1) Question No. l is compulsory.
(2) Answer any four out of remaining six questions.
(3) Assumptions made should be clearly stated.
(4) Assume any suitable data wherever required but justify the same.
(5) Figures to the right indicate marks.
(6) Illustrate answers with sketches wherever required.
(7) Answers to questions should be grouped and written together, i.e. all answers to sub-questions of individual questions like Question Nos. 1,2,3 etc. should be answered one below the other.
(8) Use legible handwriting. Use a blue/black ink pen to write answers Use of pencil should be done only to draw diagrams and graphs.

Section I

1.(a) Show with the help of suitable sketch the proper positions and the co-ordinates of atoms in a unit cell of diamond structure. Give position co-ordinates of atoms within the body. Consider one atom to be the closest to the origin. (5)

(b) Explain procedure to determine Miller Indices of a crystal plane which intercepts all the three axes. (5)
2. (a) Define - (i) ligancy and (ii) critical radius ratio. Find critical radius ratio for ligancy '8' (eight). (5)
(b) Find packing density of-(i) BCC and (ii) diamond crystal structure. (5)

3. (a) Explain with proper sketches - (i) direct and (ii) inverse piezoelectric effect. Explain its application in production of ultrasonic waves. (5)
(b) Two ships are anchored at certain distance between them. An ultrasonic signal of 50 kHz is sent from one ship to another by two routes - (i) through water and (ii) through atmosphere. The difference between time intervals for receiving the signal at the other ship is 2 seconds. If velocities of sound in atmosphere and in sea water are 348 m/s and 1392 m/s respectively, find the distance between the ships. Also find time taken by the signal to travel through water. (5)

4. (a) An electron having charge 'e' mass 'm' and velocity V is entering normally a limited uniform magnetic field of length '/' and strength 'B'. Find expression for deflection of electron path on the screen
placed at a distance 'D' from the center of the magnetic field. (5)
(b) Calculate velocities of - (i) a proton and (ii) an electron accelerated through a potential difference of 5 kV. (5)
(Given: electron mass =9.1x10 -31kg.
proton mass = 1.67 x 10 27 kg.
charge on electron =e= 1.6x 10-19 C.
charge on proton =e= 1.6x 10-19 C).

5. (a) Explain formation of energy bands in solids. Explain classification of solids into conductors, insulators and semiconductors on the basic of energy band theory. (5)
(b) Explain with neat sketches formation of P-N junction. Explain potential barrier and its behavior in forward bias and reverse bias conditions. (5)

6. (a) Explain construction of Cathode Ray Oscilloscope. Explain simple time base circuit. (5)
(b) Show that the De Broglie wave length of a charge particle is inversely proportional to the square root of accelerating potential. (5)

7. Write notes on :
(i) Electrostatic focusing (5)

(ii) i/p characteristics of transistor in CB configuration. (5)

Section II
N.B.
(1) Attempt two sections on different answer-books.
(2) Assume suitable data if necessary.
(3) In Section II Question No.l is compulsory. Attempt any three questions from Question Nos. 2 to 7.
Atomic Weights : H = 1, C = 12, O = 16, Ca = 40, Mg = 24, Na = 23, S = 32, CI = 35.5, is = 28.

1. (a) What are advantages of Hot lime-soda process? (20)
(b) What are sources of air-pollution ?
(c) Which type of lubricants are required for cutting tools, turbines etc ?
(d) Explain phosphate conditioning as a internal treatment method in case of boilers.
(e) Differentiate between Addition polymerization and Condensation polymerization.
(f) 9 ml oil is taken from machine and it requires 1.5 ml of 0.04 N KOH. Find acid value, (density of oil = 0.81 g/ml.).
(g) What are sources and effects of CO as an air-pollutant?

2. (a) Explain: Boiler corrosion; (5)
(b) Write a note on Viscosity and Viscosity index. (5)

3. (a) Describe transfer moulding in polymers. (6)
(b) Calculate the amount of time and soda required for 50,000 lit. of water sample containing - (4)
CaCO3 = 10 ppm, Mg(HCO3)2 =14.6 ppm
CO2 = 4.4 ppm, CaCl2= 22.2 ppm
MgCl2 =9.5 ppm, SiO2 = 2.8 ppm

4. (a) What are the moulding constituents of plastic? (6)
(b) Explain: Ion-Exchange resins. (4)
5. (a) What is sewage ? How is it treated by Activated Sludge Method ? (7)
(b) What are functions of lubricant? (3)
6. (a) Explain : Crepe and smoke rubber. (4)
(b) An exhausted zeolite softener was regenerated by passing 75 liters of NaCl solution having strength 75 g/lit. If hardness of water is 300 ppm, then claculate the total volume of water that is softened by zeolite softener. (6)
7. (a) What is caustic embrittlement in boilers ? (5)
(b) What is cloud point and pour point ? How is it determined ? (5)


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2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper for exam preparation. Question paper for 2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper, 2004 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper