RTU 2016 Question Paper Semester I Old Engineering Chemistry

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1E1004
B. Tech I Sem. (Back) Exam. Jan 2016
t{
frl 203 Old Engineering Chemistry
t.{ Common to all Branches of Engineering

Time: 3 Hours Maximum Marks: 80
Min. Passing Marks: 24
Instructions to Candidates :
Attempt overall five questions, selecting one questian from each unit All
questions carry equal marks.
Use of following supporting material is permitted during examination.
(Mentioned infotm No. 205)
I. NIL 2. NIL

UNIT.I
Q.1 (a) What is EDTA? How will you determine the hardness of water by
EDTA? [3+3=6]
(b) What is Bheak point chlorinationl l4l
(c) Water containing CaCO3 120 mgllit, MgCO3 84 mg/tit, Mg(NO)2 74 mgnit,

CaClzlll mgnit and KCI 100 mg/lit is to be treated with lime soda. Calculate the
amount of chemicals required for the treatment of 5000 lit of water. t61

OR
Q.l (a) Describe lime soda process for water softening. Give the chemical reactions
involved during the softening. [3+3=6]
(b) If silica is present in water, what harmful effects it can cause? t4l
(c) Calculate the amount of lime required for softening of 5000 lit of hard water
containing 72 ppm of Mg SOa. t6I

[1E1004] Page 1 of 3 [1o001

UNIT.II
Q.2 (a) What are fuels and how are they classified'/ Give examples. i6l
(b) What is the significance of octane number? t5l
(c) The percentage composition of a sample of bituminous coal was found to be as
under.

C=75.4, H=4.5, O=t2.5, N=3.1 S=1.4
The rest being ash, calculate the minimum weight of air necessary for complete
combustion of 1 kg of coal and percentage composition of the dry products of
combustion by weight. t5l
OR
Q.2 (a) With the help of a neat sketch of Junker's calorimeter describe the determination
of calorific value ofa gaseous fuel. t8l
o) Why is net calorific value (NCV) less tlan gross calorific value (GCV) t4l
(c) Calculate the gross and net calorific value of a coal sample having the following
composition -
C=80Vo, H=1Vo, O =3Vo, S=3.5Vo, N =2.17o, and ash= 4.47o. t4l

UNIT.III
Q.3 (a) State the phase rule and give its merits and limitations. tsl
(b) Draw and explain the phase diagram of Pb - Ag system. i6l
(c) Write short note on constituents of plastics. t5l
OR
Q.3 (a) Write preparation, structure and uses of (any two) - 16+6=121
(D Buna-S rubber
(ii) Buna-Nrubber
(iii) Neoprene rubber
(b) What are lubricants? How are they classified? t41

[1E1004] Page 2 of3 [1000]

UNIT.IV

Q. (a) What is atmospheric corrosion? Explain rusting of iron with the help of electro-
ofcorrosion.
chemical theory [3+7=10]
(b) What is meant by the term "Passivity"? t6l
OR
Q.a (a) Explain Mesessner effect in super conductors. Write the application of super
conductors. [4+4=8]
(b) What are fullerenes? Discuss their properties and uses. 14+4=81

Q.5 (a) What are t}re constituents of cement? Write a note on Vertical Shaft Kiln
technology for manufactue of cement. [2+6=81
(b) Define soundness of cement. t8l
OR
Q.5 (a) Give classification of glass with their respective uses. t71
(b) What is refractory? How are they classified (with examples)?. Explain the
essentials of good refractory. tel

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