University of Mumbai 2005 B.Sc General Applied Science II - Question Paper

(Given: mass of Electron: 0-00055 a.m.u.) mass of Proton : one -007593 a.m.u.)

mass of Neutron : one -008982 a.m.u.)

7. (a) What is laser action ? discuss the subsequent terms with their specific importance in laser action: 5

(i) Optical pumping (Hi) Metastable state.
(ii) Population inversion
(b) discuss what is step, graded index, mono-mode, multimode fibre. 5

part II - (Marks: 50)

N.B. (1) ques. No. one is compulsory.

(2) From remaining 5 attempt any 4 ques..

(3) All ques. carry equal marks.

(4) Figures to the right indicate full marks.

1. Attempt any 5 from the following:— 10

(a) Name few characteristics of a good fuel.

(b) provide the composition and calorific value of Biogas.

(c) provide composition and uses of Duralumin.

2. (a) What is corrosion ? discuss the corrosion due to combination of various metal electrodes. 4


(b) Write the composition, properties and uses of any 2 of the subsequent : 6

(i) Germal Silver (ii) kind Metal (iii) Commercial Brass.

3. (a) provide a brief account of different kinds of coal. Write their composition and calorific value. 6

(b) compute the gross and net calorific value of coal having subsequent composition: 4

C = 80%, H = 7%, O = 3%, S = 3-5%, N = 2-1 % and ash = 4-4%.

4. (a) What is cracking ? Distinguish ranging from thermal and catalytic cracking. 4

(b) discuss the preparation of ethyl alcohol from sugarcane. 6

5. (a) Write short note on any 2 of the subsequent : 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 subsequent 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
compute gross and net calorific value of coal.

6. (a) elaborate the main constituents of paint ? Write their functions. 4

(b) A gas has the subsequent composition by quantity H2 = 20%, CH4 = 6%, CO = 22%,
C02 = 4%, 02 = 4% and N2 = 44%. obtain the quantity of air truly supplied
perm3 of this gas.


(d) elaborate plane carbon steels ? How are they classified on the basis of carbon contents ?

(e) Distinguish ranging from anodic and cathodic metallic coating.

(f) provide the classification of crude oil.

Earning:   Approval pending.