Sunday, March 31, 2013

Anna University Question papers Polymer Chemistry 2013


 Anna University Question papers Polymer Chemistry 2013
Anna University , Chennai
B. E DEGREE EXAMINATIONS 2011 
(Textile Engineering/ Textile Technology) 
Polymer Chemistry 
Time: 3 Hrs Max. Marks: 100 
Answer all Questions 
PART – A (10 × 2 = 20 Marks) 
1. State the functionality of the monomers, styrene, 
pentaerythritol, glycerol and 1,4–butane diol. 
2. State two important criteria for a polymer to form a fibre. 
3. Compare the molecular weight of polymer and its 
distribution in free radical bulk and solution polymerisation 
techniques. 
4. What is meant by critical miscle concentration? 
5. Explain what is meant by syndiotactic and isotactic 
polystyrene. 
6. What is meant by glass transition temperature? 
7. Why polyacrylonitrile cannot be prepared by bulk
polymerisation? 
8. What are the materials used for the manufacture of PET 
by melt polycondensation? 
9. What is the function of silicone oils when used as a 
compounding material for plastics? 
10. What is the function of UV–stabilisers added to plastics? 
PART B — (5 * 16 = 80 MARKS) 
11. Discuss with suitable examples the classification of 
polymers based on the following heads. 
(i) Source 
(ii) Thermal properties 
(iii) End applications. (16) 
12. (a) (i) Discuss suspension polymerisation technique in 
detail. (12) 
(ii) Compare the advantages and disadvantages of emulsion 
and suspension polymerisation techniques. (4) 
Or 
(b) (i) Compare addition polymerisation and condensation 
polymerisation with suitable examples. (8) 
(ii) Compare the advantages and disadvantages of bulk and 
solution polymerisation techniques. (8) 
13. (a) (i) Discuss the factors affecting crystallinity and 
crystallisability. (10) 
(ii) How does crystallinity affect the properties of polymers? 
(6) 
 Or (b) (i) Explain the various phase transitions of an amorphous 
and a semicrystalline polymer. (8) 
(ii) State with reasons which polymer has higher value in 
each of the following pairs of polymers. 
* Polystyrene or Poly ( –methyl styrene) 
* Poly (methacrylate) or Poly (butylacrylate) 
* Polyethylene terephthalate or Poly (bisphenol–A 
carbonate) 
* Nylon–6 or Nylon–11. (8) 
14. (a) (i) Describe the manufacture of polyurethane foams 
and explain the mechanisms of foam formation when water 
is used as a foaming agent. (10) 
(ii) How is PET manufactured and what is its uses? (6) 
 Or 
(b) (i) Describe the manufacture of polystyrene by bulk and 
emulsion polymerization techniques and state its properties 
and uses. (8) 
(ii) Explain the formation of carbon fibre with suitable 
reactions. (8) 15. (a) (i) State any five compounding materials with 
suitable examples added to plastics and explain their 
function. (10) 
(ii) Explain the technique by which continuous polymer films 
are obtained. (6) 
 Or 
(b) Write notes on any TWO of the following : 
(i) Nylon 6, 6. (8) 
(ii) Weight average molecular weight. (8) 
(iii) Solubility parameter. (8) 

Polymer Chemistry Anna University Previous Semester Question papers 2013

Anna University Question papers Microprocessor and Microcontrollers May / June Question paper 2013


Anna University Question papers Microprocessor and Microcontrollers May / June 2012 Question paper 2012 - 2013  

B.E /B.Tech DEGREE EXAMINATION ,MAY/JUNE 2012 . 
SIXTH SEMESTER 
ELECTRICAL AND ELECTRONICS ENGINEERING 
MICROPROCESSOR AND MICROCONTROLLERS 
(REGULATION 2008) 
ANSWER ALL QUESTIONS 
PART A-(10*2=20) 

1 .If the crystal oscillator frequency is 5M H Z , calculate the time period to execute the instruction  STA4200 in 8085 processor.. 
2.what is the function of PCHL instruction? 
3.State the function of DSR and DTR pins in 8251 ? 
4.what are the different operating modes of 8253 timer? 
5.what physical address is represented by 4370H:5671H and 9A65H:0599H 
6.Illustrate the operation of the following instructions in 8086 processor. 
(a) DAA. 
(B) CBW. 
7 .list the addressing modes of 8051 . 
8.what is the function of PORT 3 In8051 micro controller? 
9.what is the resolution of 10 bit ASDC? 
10.mention any two applications of stepper motor control. 

PART A-(5*16=80 marks) 

1 1 .(a)(i) name and explain the different addressing modes used in 8085 with suitable examples.(8) 
(ii) write an 8085 assembly language program to evaluate the expression w=x2+y 2+z2.(8) 
(OR) 
(B)(i) Draw the timing diagram for the instruction IN82h of 8085 processor.(8) 
(ii)explain the hardware interrupts of 8085 processor.(8) 
1 2.(a)with neat functional block diagram , explain the features of 8255 program m able peripheral  interface and its programming modes.(1 6) 
(or) 
(b) design a circuit to interface 8251 USART with 8085 processor to handle serial data transfer operations.(16) 
1 3.(a)(i) what are the flags available in 8086 processor? Explain their functions.(8) 
(ii)explain the instructions supporting string operations in 8086 m microprocessor. 
write an ALP to move a block of data starting from memory location X to memory location starting 
from Y.(8) 
(or) 
(b)(i)draw the pin diagram of 8086 CPU and explain the functions of the pins in minimum and maximum mode of operation of 8086. (10) 
(ii)describe the circuit suitable for generation of multiple wait states for 8086 CPU module.(6) 
1 4. (a)explain the architecture of 8051 micro controller with neat block diagram .(16) 
(or) 
(b)(i)draw the circuit to interface 8K RAM with 8051 externally .explain the circuit.(8) 
(ii)explain the timer operation in 8051 micro controller with necessary diagram s.(8) 
1 5. (a)An industrial monitoring system requires monitoring nine different parameters and actuating  three different tasks, three parameters per task.use interrupt structure .provide suitable input and output devices for accessing the system . design an 8051 micro controller based system for this 
application and explain. (16) 
Or 
(b)draw the circuit to interface a DC motor to 8051 micro controller  write an 8051 assembly language program to control the speed of the motor.explain the circuit and algorithm . (16) 

Microprocessor and Microcontrollers Anna University Question papers  May / June 2012 Question paper