Anna University
HS1153- Engineering chemistry – II
HS1153- Engineering chemistry – II
Question bank
UNIT – I ENGINEERING MATERIALS
PART – A ( 2 Marks)
1. What are abrasives? Give two examples each for Natural and Artificial (synthetic) abrasives.
2. Mention some applications of abrasives.
3. What is hardness of an abrasive? What are its units?
4. How is carborundum prepared?
5. Explain Moh’s scale for different abrasives.
6. What is corundum?
7. What are refractories? How are they classified?
8. What is meant by refractoriness of a refractory?
9. What is RUL? How is RUL test carried out?
10. What is meant by thermal spalling? How to avoid it?
11. Define the terms “Lubricant” and “Lubrication”.
12. How does lubricants classify? Give example.
13. Define viscosity index.
14. Define the terms “Cloud Point” and “Pour Point”. What are their significances?
15. Define the terms “Flash Point” and “Fire Point”.
16. What are solid lubricants? Mention their application.
17. Define Porosity of a refractory.
PART – B ( 16 Marks)
1. (i)How is Silicon Carbide prepared? Give its properties and uses.(8)
(ii)Discuss the manufacture properties and uses of alumina and magnesite bricks. (8)
2. (i) Give the preparation, properties and uses of Boron Carbide.(8)
(ii)Classify refractory into different types and give one example for each. (8)
3. (i) Discuss the manufacture properties and uses of alumina and magnesite
bricks. (8)
(ii). Explain in detail about any five important properties of refractory (8).
4. (i) Explain the general methods of manufacture of refractories. (8)
(ii) Explain the mechanism of various types of Lubrications (8)
5. (i) Compare the structure of molybdenum disulphide and graphite and their uses in
lubrication. (12)
(ii) Discuss the preparation, properties and uses of zirconia bricks. (4)
UNIT – II CORROSION AND PROTECTIVE COATINGS
PART – A ( 2 Marks)
1 Define Corrosion? Give its types.
2. State the two conditions for wet corrosion to take place. (or) What is electrochemical corrosion?
3. In electrochemical corrosions, what is the general anodic reaction of a metal ‘M’? What is the
cathodic reaction in basic aqueous solution containing dissolved oxygen?
4. What is Pilling-Bed worth ratio?
5. What is hydrogen embrittlement?
6. What is decarburization?
7. Distinguish between dry corrosion and wet corrosion.
8. What are corrosion inhibitors? Give examples.
9. Explain why an iron pipes does not rust when connected to zinc but rusts rapidly when it contact
with copper.
10. What is galvanic corrosion? How it is prevented?
11. Steel screw in a brass marine hardware corrodes – Explain.
12. Bolt and nut made of the same metal is preferred in practice. Why?
13. What type of corrosion occurs in the following cases: Wire fence, Riveted joints and Iron tanks
used for storing water?
14. What are the requisites of a good paint?
15. What is the role of a pigment in paint? Give two examples.
16. Why is Tinning better than Galvanizing?
17. What is anodizing?
18. Compare galvanizing and tinning.
19. Mention any two differences between electroplating and electroless plating.
PART – B ( 16 Marks)
1. (i) List out the differences between chemical and electrochemical corrosion.
Mention any four factors that effect electrochemical corrosion. (8).
(ii)Discuss the mechanism of electrochemical corrosion by hydrogen evolution
type and oxygen absorption type. (8).
2. (i) Describe electroless platting of Nickel (8).
(ii) Explain the mechanism of oxidation corrosion and explain the role of metal
Oxide layer. (8).
3. (i) What is cathodic protection? Explain the sacrificial anode and impressed
current cathodic techniques for the prevention of corrosion. (10).
(ii) Discuss the application of corrosion inhibitors in corrosion control. (6).
4. (i). Write a brief note on differential aeration corrosion and galvanic corrosion. (8).
(ii) What is paint? What are the constituents and functions of paints? (8).
5. (i) Distinguish between electroplating and electroless plating. (8).
(ii). How the hot dipping process is carried out? (8).
6. (i) Describe the various features of anodizing of aluminum. (8).
(ii) What are the main objectives of electroplating? Give an account of th method used in
electroplating of Gold on copper. (8).
UNIT – III HIGH POLYMERS
PART – A ( 2 Marks)
PART – A ( 2 Marks)
1. Mention the preparation, properties and uses of PVC.
2. What is fluon? What are its uses?
3. How is nylon 6, 6 formed? Bring out its important properties and uses.
4. What is meant by compounding of plastics?
5. What are the advantages of injection moulding?
6. Mention some important properties of polycarbonates.
7. How is polystyrene prepared?
8. Draw the structure of Bakelite.
9. What are epoxy resins? Mention its uses.
10. Differentiate thermoplastics and thermosetting plastics.
11. What are elastomers?
12. What is vulcanization of Rubber?
13. How is natural rubber obtained?
14. What is SBR? Mention its uses.
15. How is PET prepared? Mention its uses.
PART B [ 16 marks]
1. (i) What are the various types of polymerization? Explain with suitable example. (8)
(ii). Write the preparation, properties and uses of SBR and Butyl Rubber (8)
2. (i) Write the preparation, properties and uses of Polycarbonate, Teflon and
PVC. (10).
(ii) What are epoxy resin adhesives? Give their preparation, properties and uses(6).
3. (i) What is compounding of plastics? Mention compounding material used in
Plastics, indicate their functions and give one example for each. (8).
(ii) Describe the compression moulding and injection moulding process for the
manufacture of plastics. (8).
4. (i) How is bakelite is prepared? Give its properties and uses. (8).
(ii)Write the preparation, properties and uses of Polystyrene, Nylon 6’6 and
Urea formaldehyde resin. (8).
UNIT IV – FUELS AND COMBUSTION
PART – A ( 2 Marks)
PART – A ( 2 Marks)
1. Write briefly on the ranking of coal.
2. Distinguish between proximate and ultimate analysis.
3. What is meant by the term “Fixed carbon”?
4. What is metallurgical coke?
5. Give the characteristics of metallurgical coke.
6. What is meant by refining of petroleum?
7. What is meant by hydrogenation of coal?
8. Define octane number of petrol. How can it be improved?
9. Define cetane number (or) cetane rating of diesel oil. How can it be improved?
10. Water gas is superior to producer gas. How?
11. What are the causes of knocking in internal combustion engines?
12. Give the composition and uses of producer gas.
13. What is leaded petrol? Why should leaded petrol not be used?
14. What is producer gas and water gas?
15. All coking coals are caking coals but all caking coals are not coking coals.
16. Define GCV and LCV of a fuel.
17. Mention the uses of flue gas analysis.
18. Calculate the volume of air (volume % of oxygen in air = 21) required for
the complete combustion of one litre of CO.
19. What is LPG? Mention its composition.
20. What is CNG? Mention its primary components
PART – B ( 16 Marks)
1. (i) Explain proximate analysis of coal. (8).
(ii). How is ultimate analysis of coal carried out? (8).
2. (i) What is metallurgical coke? Describe the Otto-Hoffman by product
method (8).
(ii) Explain how synthetic petrol is obtained by Bergius Process (8)
3. (i) Explain how synthetic petrol is obtained by Fisher Tropsch’s method (8)
(ii) How is producer gas manufactured? State its composition and uses. (8).
4. (i) What is water gas? How it is manufactured? Give the chemical reactions
taking place in different zones. (8).
(ii) Calculate the amount of minimum air required for complete combustion of
2 kg of coal sample with carbon – 80%, Hydrogen – 5%, Oxygen – 1%,
Nitrogen – 2% and Ash – 12%. (8).
5. (i) Calculate the gross and net calorific value of coal having the following
compositions:
Carbon – 85%, Hydrogen – 8%, Sulphur – 1%, Nitrogen – 2% and Ash – 4% (8).
(ii)How the flue gas analysis is carried out? Explain with neat diagram. (8).
UNIT V - CHEMINFORMATICS
PART – A ( 2 Marks)
PART – A ( 2 Marks)
1. What is cheminformatics?
2. Differentiate the followings. a) Conformation b) Conformational analysis
c) Conformational search.
3. Define a bond. Mention its types.
4. What is bond length? How does it vary with multiplicity of the bond?
5. What is bond angle?
6. What is the importance of the connection table?
7. How does a linear format (or) line notation represent a molecule?
8. Name some of the important line notations.
9. What is MOL format?
10. What is PDB format?
11. Define Torsional angle.
12. Define Finger Print.
13. What is canonical structure? Give example.
14. What is meant by substructure search?
15. What are the types of bitstring or binary screen available?
16. Mention the important difference between structural key and finger print.
17. What is similarity search?
PART – B ( 16 Marks)
1. (i)Explain the following with example: Bond length, Bond angle & Torsional
angle. (8).
(ii) Explain SMILES notation and MOL format. (8).
2. (i) Explain the applications of chem-informatics in drug designing. (8).
(ii). Explain the functions of finger print with specific illustrations. (8).
3. (i) How are structural datas stored in a database? Explain the important data
Storage organisations available now. (8).
(ii) How proteins are classified using PDB format? (8).
4. (i) Explain the types of coordinates generally used to represent the position of
atoms. (8).
(ii) Write notes on: (a) Strong bonds (b) weak bonds (8).
