III-B.Tech. II-Semester Supplementary Examination December 2002/January 2003 POLYMER ENGINEERING (Chemical Engineering) Max.Marks:80 Answer any Five questions All questions carry equal Marks ---
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Time:3 hours
How the natural polymer cis-polyisoprene is tapped from the tree? How is it converted into rubber sheets? What are the properties and applications of this polymer?
2.
How is phenol formaldehyde prepared? What are its properties and applications? Write the mechanism of cross-linking in this polymer.
3.
Write the preparation, properties and applications of epoxy resins. How is crosslinking achieved in this polymer?
4.
What are the different polyethylenes? How are they prepared? What are their properties and applications?
5.
Briefly explain the concept of average molecular weight of polymers. What is the effect of molecular weight on the properties of polymers?
6.
Describe a screw extruder. How are continuous objects made by extrusion process? With the help of a diagram, describe the screw.
7.
Describe the compression moulding technique. How is pressure generated and applied in the compressor? What type of articles can be made by this method? What is the advantage of transfer moulding technique?
8.
Write short notes on any FOUR of the following: a) Proteins b) Polyurethanes c) Styrene polymers d) Plasticizers e) Amino Plastics.
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Set No.
2
Code No.320706
III-B.Tech. II-Semester Supplementary Examination December 2002/January 2003 POLYMER ENGINEERING (Chemical Engineering) Max.Marks:80 Answer any Five questions All questions carry equal Marks ---
.in
Time:3 hours
Write the procedure of preparation of epoxy resins. What are their properties and applications?
2.
How are polytyrene and ABS plastics prepared? What are their properties and applilcations?
3.
How are polyolefins prepared? Write their properties and applications.
4.
What is the effect of solvents on the properties of polymers? Illustrate with suitable examples.
5.
Describe an injection moulding machine. What are its advantages and disadvantages?
6.
How are polyester plastics prepared? What are their properties and applications?
7.
What is the effect of structure on the properties of polymers? Explain with suitable examples.
8.
Write short notes on any FOUR of the following: a) Proteins b) Resorcinol resins c) Polymethyl methacrylate d) Amino Plastics e) Polyurethanes.
Answer any Five questions All questions carry equal Marks --How are flexible and rigid polyurethanes prepared? What are their properties and applications?
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1.
Max.Marks:80
How are polyester plastics prepared? What are their properties and uses? How is cross-linking achieved in them?
3.
Name some copolymers of styrene. How is high impact polystyrene prepared? What are its properties and applications?
4.
How is PVC prepared? What are its properties and uses? What type of techniques can be used to convert the raw material of PVC into end products?
5.
Write the theory and mechanism of Plasticization? What are the effects of plasticizers on the properties of polymers? Illustrate with suitable examples.
6.
Describe the geometry of a twin-screw extruder. What is its advantage? Explain the working of an extruder. What type of articles this process can make?
7.
What are lubricants and flow promoters? What are internal and external lubricants? What is the effect of lubricants on the properties of polymers?
8.
Write short notes on any FOUR of the following: a) Natural rubber b) Polyethylene c) Plasticizers d) Average molecular weight and its importance e) Effect of solvents on the properties of polymers.
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Set No.
4
Code No.320706
III-B.Tech. II-Semester Supplementary Examination December 2002/January 2003 POLYMER ENGINEERING (Chemical Engineering) Max.Marks:80 Answer any Five questions All questions carry equal Marks ---
.in
Time:3 hours
How is natural rubber extracted from plants? What are the properties and applications of natural rubber? Write about sulfur vulcanization of natural rubber.
2.
How are rigid and flexible polyurethanes prepared? What are their properties and applications?
3.
Write the preparation, properties and applications of polyester plastics.
4.
How are rigid and flexible PVC made? What are their properties and applications?
5.
What are the effects of molecular weight and structure of polymers on their properties?
6.
Describe the processing of articles by injection moulding technique. What are its advantages and disadvantages?
7.
Describe the compression moulding technique. How is flash minimized in transfer moulding? Describe the gate and sprue in transfer moulding.
8.
Write short notes on any FOUR of the following: a) Phenolic Plastics b) Epoxy Plastics c) Acrylic Plastics d) Plasticizers and Lubricants e) Polypropylene.
What are lubricants and flow promoters? What are internal and external · lubricants? What is the effect of lubricants on the properties of polymers? 8. Write short ...
List out the practical considerations to be checked for continuous gas ... Explain how silica analysis is done in boiler water of power plant. 3. a) What is meant by ...
What do you understand by principles of planning a building? Prepare a typical · aspect diagram for the area where direction of prevailing breeze is from North-.
b) Draw the circuit diagram of 4-bit Johnson counter using D-flip flop and explain .... 6. a) Compare merits and demerits of ripple and synchronous counters.
Given: turbine diameter = 120m and turbine operating speed = 40 rpm at · maximum efficiency. Propeller type wind turbine is considered. 4. a) What is the basic ...
Obtain an expression for unit speed, unit discharge and unit power for a turbine. 2. a) What do you understand by air vessels? Explain with a neat sketch.
1.a) Obtain the expression for the resistance and capacitance for gas system. ... List various variables to be measured and controlled in nuclear power plant.
instructions at the beginning and end of this set of code in order to switch .... 5.a) Write an assembly language program that will examine an ASCII string of 100.
If the analog i/p voltage is +6.85 v, what will be the R-2R ladder · o/p voltage when ... b) Design a ramp generator using 555 timer having an output frequency of.
efficiency of the cycle and mean effective pressure for the cycle. ... b) Calculate the heat flux emitted due to thermal radiation from a black surface at · 6000.
8.a) Write a note on creep resistant materials. b) Explain all the ... b) Sketch the creep diagram, and explain the various stages of creep. @@@@@. Set No. 2.
What is the difference between radio compass and ADF? Explain the principle · and operation of Automatic direction finder. 6. Define analog and digital ...
endurance limit of a metal. b) What are the factors which affect the fatigue strength of materials? 7. a) What is creep? Draw an ideal creep curve and explain the ...
(i) Band Rate · (ii) Request Filter ... 3. a) Write the comparison between teleprinters and CRT terminals. b) What are the ... What savings does it offer? b) What is a ...
b) How does butadiene differ from isoprene? 4.a) Describe about the synthetic fiber industry in India. b) Write, with an example on each of the following.
graph. b) Draw the state space tree for m-closing graph using a suitable graph. 8. Present a program schema for a FIFO Branch & Bound search for a Least-Cost.
b) Explain the effect of Metallurgical variables on fatigue properties · 7.a) Explain Ductile to Brittle transition phenomenon. b) Compare charpy with Izod impact testing. 8.a) What is stress relaxation. Draw stress-strain curves for ductile and brit
Information Technology, Electronics and Control Engineering, Electronics and ... Computer Engineering, Computer Science and System Engineering) ..... Draw and explain the logic diagram of a master slave D flip-flop using Nand gates. ###.
Chemical Engineering, Mechatronics, Metallurgy & Material Technology, · Aeronautical ... b) What is cache memory? Where is it placed? What is its .... 7.a) Explain the steps involved in computing the coefficients of the regression · polynomial.
b) Classify the blast furnace stoves. What are the different values in the stove and · their functions? 3.a) What factors affect reducibility of iron ores? Discuss them.
1.a) Write the name of places for occurance of iron ores in India. b) Explain the process of either Sintering or Pelletizing. 2.a) Explain hearth, tuyeres, stack with ...
