BE Mechanical Engineering Semester 2 (FE First Year)University of Mumbai
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# Applied Chemistry 2 CBCGS 2017-2018 BE Mechanical Engineering Semester 2 (FE First Year) Question Paper Solution

SubjectApplied Chemistry 2
Year2017 - 2018 (December)
Applied Chemistry 2
CBCGS
2017-2018 December
Marks: 60

1.Question.No. 1 is compulsory.

2.  Attempt any three question out of remaining five.

[15]1 | Answer any five from the following
[3]1.a

Select the compound which possesses highest octane number and highest cetanenumber out of n-heptane, n-octane and isooctane.

Chapter: [8] Fuels
Concept: Types of Cracking - Catalytic Cracking
[3]1.b

Iron does not rust even if the zinc coating is broken in a galvanized iron pipe.Give reasons.

Chapter: [6] Corrosion
Concept: Cathodic Protection Impressed Current Method
[3]1.c

Calculate the higher and lower calorific values of coal sample contains 84%carbon, 1.5% sulphur, 0.6 Nitrogen, 5.5% hydrogen and 8.4% oxygen.

Chapter: [6] Corrosion
Concept: Types of Corrosion - Dry Or Chemical Corrosion Due to Other Gases
[3]1.d

What are drawbacks of plain carbon steel

Chapter: [7] Alloys
Concept: Plain Carbon Steel
[3]1.e

Explain the principle ‘Prevention of waste’ in green chemistry.

Chapter: [10] Green Chemistry
Concept: Green Chemistry
[3]1.f

Define and classify composite materials.

Chapter: [9] Composite Materials
Concept: Classification of Composite Materials
[3]1.g

Mention three functions of thinner in paint.

Chapter: [6] Corrosion
Concept: Organic Coatings
[15]2
[6]2.a

Define corrosion of metals. Explain the electrochemical theory of wet corrosion, giving its mechanism.

Chapter: [6] Corrosion
Concept: Types of Corrosion - Wet Or Electrochemical Corrosion- Mechanism Evolution of Hydrogen Type
[5]2.b
[3]2.b.1

1.56g of coal sample was kjeldahlished and NH_3 gas thus evolved was absorbed in 50ml of 0.1N H_2SO_4. After absorption to excess (residual) acid requires 6.25ml of 0.1N NaOH for exact neutralisation. Calculate the percentage of N in the coal sample.

Chapter: [8] Fuels
Concept: Solid Fuels
[2]2.b.2

What is supercritical CO2? Why is it considered a green solvent.

Chapter: [10] Green Chemistry
Concept: Green Solvents
[4]2.c

Write a short note on Particle reinforced composites.

Chapter: [9] Composite Materials
Concept: Classification of Composite Materials - Particle - Reinforced Composites
[15]3
[6]3.a

What is cracking? Explain in detail – fixed bed catalytic cracking.

Chapter: [8] Fuels
Concept: Types of Cracking - Catalytic Cracking
[5]3.b
[3]3.b.1

Write a note on heat resistant steel

Chapter: [7] Alloys
Concept: Heat Resisting Steels
[2]3.b.2

A metal rod half immersed in water starts corroding at the bottom. Give reasons.

Chapter: [7] Alloys
Concept: Powder Metallurgy - Methods of Powder Metal Formation
[4]3.c

Calculate the percentage of atom economy for the following reaction with respect to allyl chloride. CH3-CH=CH2+Cl2 → Cl-CH2-CH=CH2+HCl

Chapter: [10] Green Chemistry
Concept: Numerical on Atom Economy
[15]4
[6]4.a

Explain how the following factors affect the rate pf corrosion

i) pH

ii) Ratio of anode to cathode areas.

iii) Position of metal in galvanic series.

Chapter: [6] Corrosion
Concept: Factors Affecting the Rate of Corrosion Influence of Ph
[5]4.b
[3]4.b.1

Write a brief note on products obtained from natural materials.

Chapter: [10] Green Chemistry
Concept: Products from Natural Materials
[2]4.b.2

Define structural composites.

Chapter: [9] Composite Materials
Concept: Classification of Composite Materials - Structural Composites
[4]4.c

Define shape memory alloys and mention its applications.

Chapter: [7] Alloys
Concept: Shape Memory Alloys
[15]5
[6]5.a

A sample of coal was found to contain the following constituents. C = 81%, O = 8%, S = 1%, H = 5%, N = 1% and Ash = 4%. Calculate the minimum weight and volume of an required for the complete combustion of 1kg of coal.

Chapter: [8] Fuels
Concept: Solid Fuels
[5]5.b
[3]5.b.1

Discuss in brief sacrificial anode method of corrosion protection.

Chapter: [7] Alloys
Concept: Purpose of Making Alloys
[2]5.b.2

What is powder metallurgy? Mention any two advantages and two limitations of powder metallurgy.

Chapter: [7] Alloys
Concept: Powder Metallurgy - Applications of Powder Metallurgy
[4]5.c

Explain with suitable equations conventional and green synthesis of carbaryl. Also mention the principle of green chemistry involved.

Chapter: [10] Green Chemistry
Concept: Conventional and Green Synthesis of Carbaryl
[15]6
[6]6.a
[2]6.a.1

Mention the composition, properties and uses of Duralumin:

Chapter: [9] Composite Materials
Concept: Composite Materials - Characteristic properties of composite materials
[2]6.a.2

Mention the composition, properties and uses of German silver

Chapter: [9] Composite Materials
Concept: Composite Materials - Characteristic properties of composite materials
[2]6.a.3

Mention the composition, properties and uses of Gun metal

Chapter: [9] Composite Materials
Concept: Composite Materials - Characteristic properties of composite materials
[5]6.b
[3]6.b.1

Mention the advantages of composite materials

Chapter: [9] Composite Materials
Concept: Composite Materials
[2]6.b.2

Distinguish between anodic and cathodic coating

Chapter: [6] Corrosion
Concept: Factors Affecting the Rate of Corrosion Relative Area of Anodic and Cathodic Parts
[4]6.c

What is biodiesel? Discuss the method to obtain biodiesel. What are the advantages of biodiesel?

Chapter: [8] Fuels
Concept: Biodiesel

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