Download JNTUA B.Tech 1-1 R19 2020 January 19A51101T Engineering Chemistry Question Paper

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Code: 19A51101T

Time: 3 hours

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B.Tech I Year I Semester (R19) Regular Examinations January 2020

ENGINEERING CHEMISTRY

(Mechanical Engineering)

PART - A

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(Compulsory Question)

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1. Answer the following: (10 X 02 = 20 Marks)
   1. What is meant by soft water and hard water?
   2. How is the exhausted zeolite softener bed regenerated?
   3. Write a short note on corrosion.

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   4. Write about the primary cells?
   5. What are polymers? Give suitable examples?
   6. Why is Bakelite a thermosetting polymer?
   7. What are lubricants? Give one example.
   8. What is building materials?

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   9. Explain the terms sorption and desorption.
   10. Why does a gas mixed with another gas not form a colloidal system?

PART - B

(Answer all five units, 5 X 10 = 50 Marks)

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UNIT - I

2. What are boiler troubles? Explain in detail.
3. Explain about Ion-Exchange process with neat diagram

   OR

UNIT - II

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4. 1. Explain about the factors affecting the corrosion.
   2. Write a note on differences between a cell & battery.
5. 1. What are the basic principles of fuel cells?
   2. Write a short note on Galvanic corrosion.

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   OR

UNIT - III

6. 1. What are thermosetting & thermoplastic polymers? Give examples for each one.
   2. Write about applications of PVC & Bakelite.

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7. OR

   1. What are elastomers? Describe their properties?
   2. Discuss about mechanism of chain growth.

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UNIT - IV

8. 1. Write about properties of lubricating oils and its applications.
   2. Write a short note on reinforced composites.

9. OR

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   1. Explain setting and hardening of cement.
   2. Write a note on applications of refractories.

UNIT - V

10. 1. Explain about chemical and electrochemical methods of nanomaterials.

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    2. Write a short note on micelle formation.

11. OR

    1. Discuss about synthesis of colloids.
    2. Write a short note on solid-gas interface

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Max. Marks: 70