Download SGBAU B-Tech 6th Sem Poly Plast Polymer Engineering Thermodynamics Question Paper

Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 6th Sem Poly Plast Polymer Engineering Thermodynamics Previous Question Paper

B.Tech. Sixth Semester (Polymer (Plastic) Tech.) (CGS)
11129 : Polymer Engineering Thermodynamics : 6 1?? 04
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P. Pages: 2 r . ,
Time : '1" hree Hours ?llmmuwhum Max. Marks : 80
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Notes :
Due credit will be given to neatness and adequate dimensions.
Assume suitable data wherever necessary.
Diagrams and C hemicals equations should be given wherever necessary.
Illustrate your answer necessary with the help of neat sketches.
0. Use of pen Bluc/Black ink?re?ll only for \\ riting the answer book.
.pquIv?I
SECTION ? A
Prove that
i) Cp - Cv = nR for an ideal gas.
ii) Joule Thomson expansion is an isenthalpic process.
I a \
iii) LE) = 0 for an ideal gas.
at) T
Answer Three question from Section "A" and Three question from Section "B".
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n) Prove that the magnitude of the work done by the system in a reversible isothermal
expansion of an ideal gas is greater than that of irreversible expansion.
b) Explain in detail:
1) State functions ofpropenies of state function
2) State Ofequilibrium and types of equilibrium.
Explain in detail
1) Criteria for equilibria at constant. T 8: V
ii) Criteria for equilibria at constant T & 1?.
OR
:1) Explain why increase in entropy is associated with the approach to equilibrium in an isolated
system.
b) Calculate the rate of change of transition temperature with pressure for Sulphur. The data
given are transition temperature = 955?C at 1 atm. Enthalpy of transition per gram of
Sulphur is 13.4 J. Monoclinic Sulphur (Stable above transition point) has greater speci?c
volume than that othombic Sulphur by 0.0126 0111351?1
3) De?ne colligativc properties and show that Elevation of boiling point is a colligative
property.
b) The boiling point elevation of a solute is observed to be 2.3 ?K when 13.8 gm of solute of
molar mass of 154 gm/mole. is added. Calculate Kb and AHvap of the solvent.
OR
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Explai :1 in detail how does the culligmh c properties are meful in determining the
molecular weight ol'poiynm.
Calcul He the free energy nfmixing A 6 mix enthalpy nfmixing A H mix. AS mix at 25?C
and 1 arm when
l) 1') moles an are mixed with 10 moles 0ch
2:) 1') moles ofHe are mixed with 20 moles och.
SECTION - B
Explain the concept of:
1.) ('vels of polymers
2) Colloidal dispersion) of pulymcr.
Explain in deluil the degree and kinettcs ol'swelling.
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Explain in details the lltclor: affecting dissolution and swelling ofpolymers.
Explain the concept of p('?|_\'t-|cctml}1ic szution in detail.
Explam Flory Huggins theory and derive L xprcssion for the entropy of polymer solvent
mixing.
Explatn the thennodynzunics of fumon of pure polymer.
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Explain enthalpy or hit.? ot?mixing t?c-r poiymers.
Explain variation ot?thcnnodynamic af?nity 01? an polymer to a solvent with temperature
criteria of upper critical solution temperature and lower critical solution temperature.
Prove that Kc ; Kp (RI ) 1m rmctmn cqutllbnum constant.
What is the feasibility 01' any chemical reaction? Develop thermodynamic expression for
homogeneous reaction to calculate reaction equilibrium constant from enthalpy. entropy.
heat cf formation data.
OR
i) At 1600 K and 1.] atm one gram oi'u substance Az (gas) occupies 1.95 liters after
dissociation. Calculate Kp. Kc of Rx for the reaction % A2 (g) : A(g)
ii) Calculate Kp, Kc 01? K\: at 2.0 atmt
(mol. col. at A7 = '71)
Prove thermodynamically. That in a chemical reaction an increase in temperature shifts
equil..brium tn the high enthalpy sigh?.
*kiciqic'ki:
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