Engineering Chemistry B.Tech Question Paper Model : sahrdaya.ac.in

College : Sahrdaya College of Engineering & Technology
University : University of Calicut
Degree : B.Tech
Semester : I & II
Subject : Engineering Chemistry
Document type : Model Question Paper
Website : sahrdaya.ac.in

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Sahrdaya Engineering Chemistry Question Paper

COMBINED FIRST AND SECOND SEMESTER B. TECH DEGREE EXAMINATION, APRIL 2014
SUBJECT :EN 09 104-
(2009 Scheme)
Time : 3 Hours

Related :Sahrdaya College of Engineering & Technology Engineering Physics B.Tech Question Paper Model : www.pdfquestion.in/6582.html

Part – A :
Answer all the questions. Each question carries 2 Marks (5 X 2 = 10 Marks)
1. What are liquid crystal polymers. Give one example.
2. What do you mean by break point chlorination
3. Define flash point and fire point of a lubricating oil
4. What is meant by electrochemical series. What is its importance
5. What is stressCorrosion.

Part – B :
Answer any four questions, Each question carries 5 Marks ( 4 X 5 = 20 Marks )
6. What are Carbon nanotubes. Give any four applications of it
7. Give an account of the various steps involved in the free radical mechanism for addition polymerization of a vinyl compound
8. Write briefly on compounding of rubber
9. What is M / M+ type electrode. Explain the working of such an electrode with a suitable example

10. What is the basic principle involved in the cathodic protection methods for control of corrosion. Explain the sacrificial anodic protection method
11. What is BOD. Write briefly the experimental procedure for the determination of BOD

Part -C :
Answer (a) or (b) of each questions. Each question carries 10 Marks( 4 X 10 Marks = 40 )
12. (a) What is band theory for conductivity in solids. Explain the conductivity in n-type and p-type semiconductors based on the theory (10)
OR
(b)Describe the principle and procedure involved in the estimation of different types Of hardness present in a water sample. (10)

13. (a)What do you mean by ionic polymerization? Explain with relevant reactions.
(10)
OR
(b) Give a detailed note on theories of mechanism of lubrication. (10)

14. (a) (i) What is a salt bridge. What is its significance (3)
(ii)What is glass electrode. Explain the determination of pH using glass electrode (7)
OR
(b)Explain (i) The construction and working of a Nickel- Cadmium storage cell
(5)
(ii) The mechanism of buffering action of a Basic buffer (5)

15. (a) What are paints . Give an account of the various constituents and their function in a paint with examples (10)
OR
(b)Give an account of different metallic coatings used for corrosion control (10)

Subject : En 09 104- Engineering Chemistry (2009 Scheme)

Scheme of Evaluation

Part – A

Each question carries 2 Marks (5 X 2 = 10 Marks)
1. What are liquid crystal polymers. Give one example.
Definition – 1 Mark
Any one example (Aramid fibres / Polymethyl methacrylates) – 1 Mark

2. What do you mean by break point chlorination
Break point Chlorination- Definition (a stage in the chlorination beyond which free residual chlorine starts appearing in the treated water) – 2 Marks

3. Define flash point and fire point of a lubricating oil
Flash Point – the temperature at which oil produces enough vapours to ignite for a moment when flame is shown above it – 1 Mark
Fire Point – – the temperature at which oil produces enough vapours to ignite continuously for about 5 secs when flame is shown above it -1 Mark

4. What is meant by electrochemical series. What is its importance
Electrochemical series definition – arrangements of metals in the increasing order of reduction potential -1 Mark
Importance or its significance – -1 Mark

5. What is stress Corrosion.
A type of electrochemical corrosion – due to the combined effect of an internal stress in the metal and corrosive environment – 2 Marks

Part – B

Answer any four questions, Each question carries 5 Marks ( 4 X 5 = 20 Marks )
6. What are Carbon nanotubes. Give any four applications of it
Carbon Nano tubes definition / explanation of structure – 1 Mark
Any four applications – 1 Mark each

7. Give an account of the various steps involved in the free radical mechanism for addition polymerization of a vinyl compound
Addition polymerization explanation / definition – 1 Mark
Initiation step reactions – 2 Marks
Propagation step – 1 Mark
Termination step – 1 Mark

8. Write briefly on compounding of rubber
Definition – Mixing of various ingredients along with raw rubber – 2 Mark
Any three ingredients mixed with rubber and their functions – 3 Marks

9. What is M / M+ – type electrode. Explain the working of such an electrode with a suitable example
General explanation of the M / M+ type of electrode – 2 Marks
Example – Cu / Cu 2+, construction of such an electrode, electrode potential equation for such an electrode – 3 Marks

10. What is the basic principle involved in the cathodic protection methods for control of corrosion. Explain the sacrificial anodic protection method
Principle behingCathodic protection- 2 Marks
Sacrificial anodic protection – explanation- 3 Marks

11. What is BOD. Write briefly the experimental procedure for the determination of BOD
BOD – Definition -2 Marks
Experimental determination – 3 Marks

Part -C

Answer (a) or (b) of each questions. Each question carries 10 Marks ( 4 X 10 Marks = 40 )
1. (a) What is band theory for conductivity in solids. Explain the conductivity in n-type and p-type semiconductors based on the theory
Band theory main points- 4 Marks
Band theory applied in the intrinsic semiconductors- 2 Marks
Band theory applied in extrinsic semi conductors, n type – 2 Marks
P type – 2 Marks
OR
(b)Describe the principle and procedure involved in the estimation of different types of hardness present in a water sample.
Basic Principle of estimation of hardness by EDTA method with reactions –
– 4 Marks
Experiment– standardization of EDTA – 1 Mark
Determination of total hardness – 2 Marks
Determination of Permanent hardness – 2 Marks
Calculation of Temporary hardness- 1 Mark

2. (a)What do you mean by ionic polymerization?Explain with relevant reactions.
Introduction on ionic polymerization – 1 Mark
Types – 1 Mark
Cationic polymerisation with reactions 4 Marks
Anionic polymerization 4 Marks

OR
(b) Givea detailed note on theories of mechanism of lubrication.
Explanation of What are lubricants -1 Mark
Three mechanisms
Thick film lubrication, 3 Marks
Thin film lubrication, 3 Marks
Exteme pressure lubrication 3 Marks

3. (a) (i) What is a salt bridge. What is its significance
Explanation of contruction of salt bridge and its role in cell
– 2 Marks
(ii) What is glass electrode. Explain the determination of pH using glass electrode
Glass electrode construction – 2 Marks
Experimental determination of pH explanation with diagram and equation – 6 Marks
OR
(b)Explain (i) The construction and working of a Nickel- Cadmium storage cell Explanation/construction of Nickel – Cadmium cell – 3 Marks
Reactions – 2 Marks
(ii) The mechanism of buffering action of a Basic buffer
Explanation – 3 Marks
Reactions – 2 Marks

4. (a) What are paints . Give an account of the various constituents and their function in a
paint with examples
Paints explanation – 3 Marks
7 constituents with their functions and one example each – 7 Marks
OR
(b)Give an account of different metallic coatings used for corrosion control
Explanations on Galvanising- 2.5 Marks
Tinning 2.5 Marks
Cementation (Diffusion coating) 2.5 Marks Electroplating 2.5 Marks