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Monday, November 28, 2016

CY6151 Engineering Chemistry-I Nov Dec 2016 Important Questions

Important questions / expected questions for Nov Dec 2016 CY6151 Engineering Chemistry-I examinations conducting by Anna University Chennai
01st Semester / First Semester / I Year
Common to ALL departments
CY6151 Engineering Chemistry-I
(Regulation 2013)
Nov Dec 2016 Important Questions

Important 16 Marks Questions with answers (All five units) are listed for CY6151 Engineering Chemistry-I Subject

1. i) Differentiate thermoplastics and thermosetting plastics.
ii) Explain the mechanism of free radical polymerization of polyvinyl chloride.

2. i) Explain the mechanism of anionic polymerization
ii) Explain how molecular weight of a polymer is calculated by weight average method.

3. i) What are stereospecific polymers? Explain its various types.
ii) How are polymers classified? Explain.

4. Write the preparation, properties and uses of
i) Nylon-6, 6, ii) Epoxy resin

5. Write notes on the following
i) Molecular weight of a polymer
ii) Polydispersity index
iii) Emulsion polymerization
iv) Suspension polymerization.

6. i) Derive the Clausius inequality.
ii) Derive that ΔS > 1 for an irreversible process.

7. i) Derive Gibb’s Helmholtz equation . Mention its applications
ii) For the reaction
H2 + ½ O2 →H2O , ΔH =-68.32, ΔG = - 56.69
Calculate the value of free energy change at 25ºC.

8. i) Derive Vant Hoff’s isotherm
ii) Calculate the entropy change in the evaporation of one mole of water at 100ºC. Latent heat of
vapourisation at 100ºC is 540 Cal/g.

9. i) Derive an expression for the variation of equilibrium constant of a reaction with temperature.
ii) kp for N2 + 3H2 - NH3 is 1.64 x 10^-4 atm and 0.144x10^-4 atm at 400 Deg C and 500 Deg C respectively. Calculate the heat of the reaction. Given R = 1.987 Cal/mole.

10. i) Describe a) Extensive property, b) Intensive property, c) Thermodynamic property
ii) Calculate the ΔG when one mole of the ideal gas expands reversibly isothermally at 37ºC from an initial volume of 55dm^3 to 1000 dm^3.

11. (i) With the help of jablonski diagram, explain radiative and non-radiative pathways for an electronic transition.
(ii) How quantum efficiency is determined experimentally? Explain.

12. (i) Distinguish between (a) fluorescence and phosphorescence (b) Thermal and photochemical reactions
(ii) What are the causes for high and low quantum yield? Define the same

13. (i)Explain about chemiluminescence and photosensitization with suitable examples.
(ii) Calculate the energy associated with (a) one photon, (b) one Einstein of radiation of wavelength 8000Å.

14. (i) Explain the principle of IR spectroscopy and discuss the functions of various components in IR spectrophotometer.
(ii) Discuss the applications of IR spectroscopy.

15. (i) Discuss the principle, instrumentation and working mechanism of UV-Visible spectroscopy.
(ii) Discuss the applications of UV-Visible spectroscopy

16. 1.(i) What is a phase diagram? With the help of phase diagram discuss one component system.
(ii) Explain thermal analysis. Mention its uses.

17. (i) Write the composition, properties and uses of any two non ferrous alloys.
(ii) What are the types of alloys? Discuss the purpose of making alloys

18. (i) Discuss the effect of Ni, Cr and Mn in the alloying of steel.
(ii) What is an alloy steel? What is the need for alloying steel? What are the uses of alloy steel?

19. (i) Discuss a) Heat resisting alloy steel b) Magnetic steel
(ii) What are stainless steel? Describe the different types of stainless steel.

20. (i) What are non ferrous alloys? What are its applications? Write about any two non ferrous alloys.
(ii) Discuss the composition, characteristics and uses of German silver and Gun metal.

21. (i) Discuss the electrical properties of CNTs.
(ii) What are SWCNTs and MWCNTs? Compare their properties with other conventional materials.

22. (i) Explain CVD with principle, precursors used, chemical reactions involved, advantages and applications?
(ii) Discuss the mechanical properties of CNTs.

23. (i) Bring out the differences between molecules, nanomaterials and bulk materials.
(ii) Explain top – down and bottom – up nanomaterial preparation with examples

24. (i) Outline electrical, electronic application of nanoparticles.
(ii) Give an account of mechanical, optical and medical applications of nanoparticles.

25. (i) Describe the different types of CNTs.
(ii) Give an account of the tools employed in the study of nanoparticles

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