07a1bs07 - Engineering Chemistry

Code No: 07A1BS07 Set No. 1 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY, HYDERABAD I B.Tech II Mid-Term Examinations, Feb. – 2009 ENGINEERING CHEMISTRY Objective Exam Name: __________________ Hall Ticket No. ________________ Answer All Questions. All Questions Carry Equal Marks. Time: 20 Min. Marks: 20. I.

Choose the correct alternative:

1.

The process of cementation of corroding metal with zinc is termed (A) Blasting (B) Sheradizing (C) Galvanizing (D) Tinning

[

]

2.

The chemical composition of black rust of iron is (A) Fe3O4 (B) FeOH (C) Fe(OH)3 (D) FeO

[

]

3.

Copolymerisation of hexamethylene diamine and adipic acid gives (A) Bakelite (B) Nylon 6 (C) Nylon6.6 (D) Nylon 11

[

]

4.

Natural rubber is a polymer of (A) Neoprene (B) Vinyl chloride (C) Cis-Isoprene (D) Ethylene

[

]

5.

An example of thermosetting plastic among the following is (A) Bakelite (B) PVC (C) HDPE (D) Cellulose

[

]

6.

In the elastomer Buna-S, S stands for (A) Sulphur (B) Styrene (C) Synthetic (D) Symmetric

[

]

7.

Vulcanised rubber containing more than 30% of sulphuer is known as (A) Crepe rubber (B) Soft rubber (C) Ebonite (D) Elastic rubber

[

]

8.

Removal of scale from the surface of a metal to be elecrtoplated with dilute and warm sulphuric acid is termed (A) Galvanising (B) Blasting (C) Tanning (D) Pickling

[

]

[

]

9.

Electrochemical corrosion always occurs at the (A) Anode (B) Cathode (C) Cathode& anode (D) Inert cathode

10.

A device which produces current due to chemical reaction is known as (A) Electrolytic cell (B) Galvanic cell (C) Chemical cell (D) Poly cell

Cont…..2

[2] Code No:

07A1BS07

Set No. 1

II

Fill in the Blanks

11.

Reduction in the value of over voltage of a metal ___________ the rate of corrosion

12.

Compared to Mg, Sn_____ undergoes corrosion faster

13.

In the synthetic rubber Buna-N, N stands for _______________

14.

Daniel cell is an example of ______________ cell

15.

The functional group in styrene is_______________

III

Match the Following

16.

Buna-N

[

]

(a) Camphor

17.

Natural rubber

[

]

(b) Poly tetra fluoro ethylene

18.

Plasticizer

[

]

(c) Polyisoprene

19.

Neoprene

[

]

(d) Poly ethylene

20.

Teflon

[

]

(e) Polymer of chloroprene (f) Synthetic rubber

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Code No: 07A1BS07 Set No. 2 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY, HYDERABAD I B.Tech II Mid-Term Examinations, Feb. – 2009 ENGINEERING CHEMISTRY Objective Exam Name: __________________ Hall Ticket No. ________________ Answer All Questions. All Questions Carry Equal Marks. Time: 20 Min. Marks: 20. I.

Choose the correct alternative:

1.

The chemical composition of brown rust of iron is (A) Fe2O3 with Fe(OH)3 (B) Fe (OH)2 (C) FeO (D) Fe(OH)3

[

]

2.

Galvenization of iron involves the coating of iron with (A) Tin (B) Zinc (C) Magnesium (D) Cobalt

[

]

3.

The ratio of the volume of the metal oxde to the metal is termed (A) Specific volume (B) Specific density (C) Specific ratio (D) Specific volume ratio

[

]

4.

The process of cementation of zinc powder to iron is termed as (A) Colourising (B) Sheradizing (C) Galvanizing (D) Blasting

[

]

5.

Polymerisation of chloroprene results in the formation of the polymer (A) Bakelite (B) Nylon (C) Neoprene (D) Nylon 6

[

]

6.

Self condensation of amino amino caproic acid produces the plastic (A) Nylon 6 (B) Nylon (C) Nylon 6.6 (D) Melamine

[

]

7.

Which one of the following is used to vulcanise natural rubber ? (A) Phosphorus (B) Camphur (C) Sulphuryl Chloride (D) Graphite

[

]

8.

Which of the following is used as plastisizer in plastics ? (A) Trycresyl phosphate (B) Carborundum (C) Graphite (D) Mica

[

]

9.

Addition of hydrazine hydrate to corrosive environment (A) Consumes oxygen (B) Consumes CO2 (C) Consumes Hydrogen (D) Reduces overvoltage

[

]

10.

Specific volume ratio of Ni,Cr,W are 1.6,2.0, and 3.6 respectively rate of oxidation of Ni is [ ] (A) More (B) Least (C) More at high temperatures (D) More at high pressures

Cont……2

[2] Code No:

07A1BS07

Set No. 2

II

Fill in the Blanks

11.

Of Mg , Sn and W the one that undergoes corrosion is ___________

12.

Phenol and formaldehyde on ________ give bakelite

13.

Nylon is an example of ______ Polymer

14.

Etrusion moulding is used mainly for ______ moulding of of thermoplastic resins

15.

The rate of corrosion ________________when the ratio of anodic to cathodic area decreases

III

Match the Following

16.

GR-S

[

]

(a) Filler

17.

Mica

[

]

(b) Vulcanization

18.

Sulphur

[

]

(c) Galvenic cell

19.

Daniel cell

[

]

(d) Elastomer

20.

Zinc metal

[

]

(e) Extrusion moulding (f) Sacrificial anode (g) Oxidiser

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Code No: 07A1BS07 Set No. 3 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY, HYDERABAD I B.Tech II Mid-Term Examinations, Feb. – 2009 ENGINEERING CHEMISTRY Objective Exam Name: __________________ Hall Ticket No. ________________ Answer All Questions. All Questions Carry Equal Marks. Time: 20 Min. Marks: 20. I.

Choose the correct alternative:

1.

The film forming constituent of paint among the following is (A) Filler (B) Drying oil (C) Pigment (D) Plsticizer

2.

The ability of an electrolytic cell to give a deposit of uniform thickness over the entire cathodic area is known as (A) Throwing power (B) Agitation (C) Chromising (D) Colorising

[

]

[

]

[

]

3.

Electrochemical corrosion accuers at (A) Cathode (B) Inert anode (C) Inert cathode (D) Anode

4.

Co-polymerisation of isocyanate and polycarboxylic acids results in the formation of [ (A) Bakelite (B) Nylon (C) Polyurethane (D) Glyptal

]

5.

Which among the following is common packing material (A) Polyvinyl Plastics (B) Thermocole (C) Glyptol (D) Nylon-11

[

]

6.

The raw material used in bio-medical applications among the following is (A) Bakelite (B) Nylon (C) Polyurethane (D) P.V.C

[

]

7.

The adhesive used in the preparation of laminated glass is [ (A) Polyvinyl-butyl resin (B) Polycresyl phosphate (C) Araldite (D) Glyptal

]

8.

The chemical composition of the corossion product of iron is (A) FeO (B) Fe2O (C) FeOH (D) Fe2O3xH2O

[

]

9.

Which plastic among the following can be used as a substitute to glass (A) PVC (B) Nylon (C) Polymetylmethacrylate (D) Nylon.66

[

]

10.

Styrene among the following is (A) C6H5-OH (B) C6H5-CH3 (C) C6H5-CH=CH2 (D) C6H5-NO2

[

]

Cont…..2

[2] Code No:

07A1BS07

Set No. 3

II

True (or) False Statement

11.

The current density at a small anodic area is very large

12.

Any metal choosen for cathodic protection must be more easily oxidised than the one to be protected. [True/False]

13.

In acidic environment higher the over-voltage greater is the rate of corrosion [True/False]

14.

Food - stuff containers can be galvanised

[True/False]

15.

Tinning is an example of cathodic coating.

[True/False]

III

Match the Following

16.

-- F2C--CF2--

[

]

(a) Chloroprene

17.

NYLON

[

]

(b) Isoprene

18.

BAKELITE

[

]

(c) Monomer of teflon

19.

Ebonite

[

]

(d)

20.

CH2=CCH3.CH=CH2

[

]

(e) Thermo-setting plastic (f)

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[True/False]

Polyamide fibre

Highly vulcanised natural rubber

Code No: 07A1BS07 Set No. 4 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY, HYDERABAD I B.Tech II Mid-Term Examinations, Feb. – 2009 ENGINEERING CHEMISTRY Objective Exam Name: __________________ Hall Ticket No. ________________ Answer All Questions. All Questions Carry Equal Marks. Time: 20 Min. Marks: 20. I.

Choose the correct alternative:

1.

Bakelite is formed by the condensation of phenol with [ (A) Acetic acid (B) Benzene (C) Acetaldehyde (D) Formaldehyde

]

2.

The raw material required for the preparation of thermocole is (A) Bakelite (B) Nylon (C) Neoprene (D) Polyurethane

[

]

3.

The conversion of Fe into ferric ion is termed (A) Decomposition (B) Addition (C) Oxidation (D) Reduction

[

]

4.

The specific volume ratio of which of the following metal is greater than the metal? [ ] (A) Sodium (B) Potassium (C) Magnesium (D) Aluminium

5.

Galvanic series comprises of metals and [ (A) Non-Metals (B) Only Metals (C) Alloys (D) Transition metals

6.

Co-polymerisation of butadiene with isoprene results in the formation of butyl rubber having high [ (A) Strength (B) Brittleness (C) Softness (D) High Gas Permeability

]

]

7.

The catalyst used in the production of Teflon from 2F-C=C-F2 is [ (A) Hydrogen peroxide (B) Sodium Peroxide (C) Benzoyl Peroxide (D) Nickel

]

8.

The raw materials required for the preparation of silicon polymers are (A) SiCl4 & CH3 Mg Cl (B) CH3Cl & Si (C) C6H6&C2H2 (D) Si&CH3MgCl

[

]

9.

Which of the folloing represents Ziegler-Natta catalyst ? (A) CH3MgCl (B) C2H5MgCl (C) (C2H5)3Al (D) C2H5MgCl

[

]

10.

The process of coating zinc over iron metal is termed (A) Electroplating (B) Galvanising (C) Tinning (D) Coloring

[

]

Cont….2

[2] Code No:

07A1BS07

Set No. 4

II

Fill in the Blanks

11.

The modulous of natural rubber is _____________

12.

Neoprene is formed by polymerisation of ________________

13.

Stuctural formula of acrylonitrile is__________________

14.

With the increase in temperature hydrogen type of corrosion __________________

15. Natural rubber is a polymer of ___________isoprene

III

Match the Following

16.

Nylon 6

[

]

(a) Cellulose

17.

Thermocole

[

]

(b) Nitrocellulose

18.

Bakelite

[

]

(c) Polyurethane

19.

Cis-isoprene

[

]

(d) Cross linked polymer

20.

Motion picture films [

]

(e) Caprolactam (f) Monomer of Natural rubber

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