2003 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper for exam preparation. Question paper for 2003 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper, 2003 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper. SiteMap

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# 2003 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper

University Question Papers
2003 University of Mumbai Bombay B E APPLIED SCIENCES I University Question paper
APPLIED SCIENCES-I (JUNE. 2003)
Section I
1.(a) Write two important points regarding diamond structure. How many atoms are there per unit cell? Derive its packing efficiency. (7)
(B) Define piezo-electric effect, and show how piezo electric oscillator produces ultrasound (with proper circuit diagram.) (5)
(c) A charge water drop is just floating in a uniform electric field of 250 V/M. Find the charge on it. Given: Radius of water drop = 10-8 m, Density of water = 103 kg/m3. ,(5)

2. (a) What is potential barrier? How it is formed in a p-n junction? (6)
(b) What are matter waves? Mention at least three characteristics of them. (5)
(c)An ultrasonic beam of 1 cm wavelength is sent by a ship, returns from the sea bed after 2 sec. If velocity of ultrasonic beam in sea water is 1510 m/sec at 0°C, its salinity at 30°C is 29 gm/lit, calculate the depth of sea bed at 30°C and frequency of ultrasonic beam. (6)

3.(a) Derive the formula for displacement of electron in transverse electric field. - (8)
(b) Explain the construction of C.R.O. and discuss how AC, D.C. voltage, frequency and phase angle between two A.C. voltage measured by C.R.O. (8)

4. (a) Draw the following:- (/ = read as bar)
(i) (0 /1 1), (1 2 1), (1 /2 3) (3) (ii)(0 /1 1),(1 2 1),(1 2 3) (3)
(b) Show that for an instric semiconductors at low temperatures EF= (EC+EV)/2 where symbols have their usual meanings. (8)
(c)(i) At what angle to the magnetic field the charged particle should entre to experience maximum force? (1)
(ii) Show that magnetic force does not act on static charge. (1)
(iii) If the charged particle enters the magnetic field- either parallel or antiparallel to the field direction, what is the value of result force? (1)

5. Write short note on:
(a) Significance of ligancy in crystals. (5)
(b) Use of ultrasonic in Non-Destructive testing. (5)
(c) Electrostatic and Magnetostatic focusing. (6)
Section II
(At wts : H = 1; Ca = 40; mg = 24; C = 12; O = 16; S = 32; Fe = 56)

6.Answer any six of the following:- (18)
(a) Why is hot lime soda process better than the cold process.
(b) List the difference between addition and condensation polymerization.
(c) Define grease? Under which situation it is used as a lubricant.
(d) What is green house effect?
(e) Explain phosphate conditioning of water.
(f) An oil blend used was analysed for its acid value 6 ml of oil required 3.5 ml. N/100 kOH. Find its acid value state whether the blend can be still be useful for lubrication (density oil = 0.89).
(g) What is difference between scale & sludge.
(h) Explain the significance of vulcanisation.

7. (a) Explain the demineralization of hard water, with a neat diagram and appropriate equations. (6)
(b) Give preparation properties and uses of silicon rubber. (6)
(c) Write a note on solid lubricants. (4)

8. (a) Calculate the quantities of lime and soda (90% pure each) required for softening 25000 litres of hard water containing following ions/chemicals. (6)
HCO3= 12.2 PPM; C02 = 4.4PPM;
Ca++ = 30PPM; Mg++ = 21.6 PPM;
Fe2O3= 15.4 PPM; H2SO4 = 4.9PPM.
(b) Give the manufacturing process, properties and uses of Bakelite. (6)

(c) Define lubrication, Explain boundary film lubrication. (4)
9. (a) What is air pollution? Mention various types of air pollutants and discuss the effect of following on environment: (7)
(i) Nitrogen oxides (ii) Hydrogen sulphide (iii) Sulphur dioxide.
(b) The hardness of 75,000 litres of a water sample was completely removed by a permutit. The exhausted permutit then required 1500 litres of NaCl containing 117 mg of NaCl per litre regeneration calculate the hardness of water sample. (5)
(c)Mention the various method used for fabricating plastics and discuss the transfer moulding in detail? (4)