DPT III Semester Exam - January 2022 - PDF

# **CENTRAL INSTITUTE OF PETROCHEMICALS ENGINEERING & TECHNOLOGY** ## **THIRD SEMESTER EXAMINATION - JANUARY - 2022** ### **PART - A** **Answer all questions** | **Question Number** | **Question** | **Answer** | |---|---|---| | 1 | If **the** arrangement of alkyl groups on carbon chain is on sa...

# **CENTRAL INSTITUTE OF PETROCHEMICALS ENGINEERING & TECHNOLOGY** ## **THIRD SEMESTER EXAMINATION - JANUARY - 2022** ### **PART - A** **Answer all questions** | **Question Number** | **Question** | **Answer** | |---|---|---| | 1 | If **the** arrangement of alkyl groups on carbon chain is on same side it is called | a) Syndiotactic | | 2 | Weight average molecular weight is determined by | a) Light Scattering | | 3 | Diphenyl picryl hydrzide is the example for | a) Initiator | | 4 | Hexa methylene diamin and adipic acid is used for the synthesis of | a) Nylon 6,6 | | 5 | Dicumyl peroxide is the example for | a) Initiator | | 6 | Which **of the following** is the example for branch polymer? | d) Both LDPE & LLDPE | | 7 | Chemically modified natural polymer is called | b) Semi synthetic polymer | | 8 | Styrene Acrylonitryle (SAN) is the example for | a) Polymer | | 9 | -AAAABBBBAAAABBBBAAAA- represents | a) Block copolymer | | 10 | Polymer below Tg are | b) Soft & Flexible | | 11 | Inter molecular hydrogen bonding is observed for | a) Nylon 66 | | 12 | Which **of the following** polymer is insoluble and infusible? | c) Cross linked Polymer | | 13 | Which **of the following** is the trade name for polytetra fluroethylene? | a) Teflon | | 14 | Which **of the following** is the relation between Tg & Tm for unsymmetrical polymer? | d) None of these | | 15 | Which **of the following** material is transparent in nature? | a) PMMA | | 16 | The criteria of monomer for addition polymerization is | - | | 17 | Condensation polymerization is also called as | - | | 18 | Inhibitors help to | - | | 19 | Cellulose is the example for | - | | 20 | Three dimensional network structure is observed for | - | | 21 | Creep is a time independent property of a **body** at constant stress. Say True or False | - | | 22 | Thermal stability of thermoset polymers is more than thermoplastic polymer- True or False | - | | 23 | Polymers with carbon chain backbone are easily biodegradable. Say True or False | - | | 24 | HDPE is Less crystalline than LDPE -True or False | - | | 25 | Cellulose Nitrate is the example for semi synthetic polymer-True or False | - | | 26 | Full form of DSC is | - | | 27 | Expand DCP which is used for initiator | - | | 28 | Full form of TGA is | - | | 29 | Expand GPC | - | | 30 | Full form of CA for semi synthetic polymer is | - | ### **PART - B** **Answer all questions (Max. 40 words)** 1. Define Monomer and Polymer with suitable examples. 2. What is the function of inhibitors? Give suitable examples. 3. Give two examples each for amorphous and crystalline polymers. 4. Define Critical Micelle Concentration (CMC) for Emulsion Polymerization. ### **PART - C** **Answer any four questions (Max. 100 words)** 1. Write down the advantages and disadvantages of solution polymerization. 2. What is the effect molecular weight on the mechanical properties of polymer? 3. What do you mean by bead or pearl polymerization? Write down two advantages of Solution polymerization. 4. What do you mean by rheology? Briefly explain the term Visco elasticity. 5. Define Linear, branched and cross linked Polymers with Examples. ### **PART - D** **Answer any two questions (Max. 300 words)** 1. Define MFI. Briefly write down the procedure for the determination of MFI for the Polymeric Materials. 2. Write short Notes on TGA. 3. Briefly discuss about the emulsion Polymerization and also write down its advantages. # **CENTRAL INSTITUTE OF PETROCHEMICALS ENGINEERING & TECHNOLOGY** ## **THIRD SEMESTER EXAMINATION - JANUARY - 2022** ### **PART - A** **Answer all questions** | **Question Number** | **Question** | **Answer** | |---|---|---| | 1 | Cellulose is Thermo set plastics say True/False | True/False | | 2 | Fish Net is made out of POM say True/False | True/False | | 3 | Melting point depends on the _ content in the polymer | (c) Both A& B | | 4 | Brand Name of PF is | - | | 5 | Full form of PET is | - | | 6 | Full form of PC is | - | | 7 | Urea formaldehyde is Transparent Material say True/False | True/False | | 8 | Expand UHMWHDPE | - | | 9 | ABS has better Impact Strength than HIPS say True/False | True/False | | 10 | Expand UF | - | | 11 | Which **of the following** is commonly used for Vacuum Forming ? | (d) HDPE | | 12 | Which plastic materials contain strong cross linking is their molecular structure ? | (b) Thermosetting Plastic | | 13 | Which Plastic Material is used for Laminate Kitchen work top? | (a) Epoxy | | 14 | CD is made out of | (a) PC | | 15 | Teflon is Trade Name of | (a) Plastics | | 16 | Absolac is Trade Name of | (b) PET | | 17 | Good Impact Properties of HIPS is due to presence of _ in its molecular structure | (b) Rubber | | 18 | Abbrevation of Low Density Polyethylene | - | | 19 | Write down the Melting Point of Nylon 6,6 | - | | 20 | Shellac is produced from the secretion of an | (d) None of these | | 21 | Expand HDPE | - | | 22 | Nylon is a _ Material | - | | 23 | Polycarbonate has rigidity up to 140°C say True/False | True/False | | 24 | K-Value is measure for | (d) PVC | | 25 | MEKP is Catalyst for unsaturated Polyester resin cutting say True/False | True/False | | 26 | Hexamethylenediamine and _ for is used Preparation of Nylon 6,6 | (b) Adipic Acid | | 27 | Meting Point of Polyacetal is | (d) 265°C | | 28 | Cooker Handle is made out of | (d) Nylon | | 29 | Choose the Toughest Material among the following. | (a) HDPE | | 30 | Choose the Self Lubricity Material | (b) PTFE | ### **PART - B** **Answer all questions (Max. 40 words)** 1. Write down the properties of PMMA. 2. Write down the application of Epoxy. 3. Name few Engineering Plastics. 4. Enlist the properties of PP. ### **PART - C** **Answer any four questions (Max. 100 words)** 1. Write short notes on shellac. 2. Suggest suitable materials for following products a) Jewelry Box b) Compact disc c) Fishnet 3. Write down the application of LDPE. 4. Define thermosetting plastics. 5. Write down properties of PVC. ### **PART - D** **Answer any two questions (Max. 300 words)** 1. Explain briefly about properties and application of PET. 2. Write short notes on a) PC b) HIPS 3. Why PMMA is widely used for automobile industry? Explain briefly. # **CENTRAL INSTITUTE OF PETROCHEMICALS ENGINEERING & TECHNOLOGY** ## **THIRD SEMESTER EXAMINATION - JANUARY - 2022** ### **PART - A** **Answer all questions** | **Question Number** | **Question** | **Answer** | |---|---|---| | 1 | Back pressure is applied for | c) Increase injection speed | | 2 | Leaking out or flashing occurs at the | d) Mould Runner | | 3 | Gap between core and cavity when the mould is fully closed is called | c) Impression | | 4 | The processing technique is mostly used for processing thermoset materials is | d) Extrusion Process | | 5 | Injection Moulding machine can be used to manufacture | d) Pipes and Tubes | | 6 | Preform is associated with | c) Stretch Blow Moulding | | 7 | Injection capacity is specified by | c) Both a) & b) | | 8 | Warpage in a molding can be eliminated by designing the part with | d) All of these | | 9 | Silver streaks defect arises during molding process could be due to | c) Both a) & b) | | 10 | The heating system of an Extruder can be of | d) Any one of these | | 11 | In blown film extrusion, the BUR is normally in the range of | d) 7:1 to 9:1 | | 12 | Which one of the plastics material requires preheating before processing? | d) None of these | | 13 | The ratio of the first flight depth of feed zone to the last flight depth of the metering zone is called | - | | 14 | The shot-to-shot variation in injection molding is due to | d) All of these | | 15 | Larger runner produces | d) All of these | | 16 | A shallow channel or opening cut in the cavity to allow air or gases to escape as the melt fills the Cavity is called | - | | 17 | Blown films will be classified with thickness _ than 0.010 inch. | - | | 18 | The surface texture and appearance of a finished article is called. | - | | 19 | _ is used to sense the temperature of barrel. | - | | 20 | The tendency of a plastic article to turn white or chalky in areas that are highly stressed is called | - | | 21 | The channel through which the molten resin flows from the runner into the cavity is called gate. (Say True or False) | True | | 22 | Pelleting of the material in compression and Transfer molding permits accurate measurement of the charge to the mold-(say True or False) | True | | 23 | Time required to fill the cavity or mold is called cooling time (Say True or False). | False | | 24 | Thermoforming is secondary process (Say True or False). | True | | 25 | Preform is manufactured by blow molding (Say True or False). | False | | 26 | PLC stands for | - | | 27 | NRV stands for | - | | 28 | Full form of BUR | - | | 29 | Full form of L/D ratio | - | | 30 | Full form of EBM | - | ### **PART - B** **Answer all questions (Max. 40 words)** 1. Define Plastics Processing. 2. What is Shot Capacity in Injection Molding process? 3. Define Mould & its types. 4. What is annealing? ### **PART - C** **Answer any four questions (Max. 100 words)** 1. How many type of dies are used in extrusion process?. Name different types of Dies. 2. Differentiate between single screw extruder and twin extruder. 3. Write the advantage of microprocessor based injection molding process over conventional Injection Molding.? 4. Briefly explain about Injection Blow molding process. Name two products produced thorough injection blow Molding Process. 5. Write short note on any two of the following: a) Limit switch b) Thrust Bearing c) Parison ### **PART - D** **Answer any two questions (Max. 300 words)** 1. Explain with suitable diagram the extrusion process for blown film. 2. Name various types of defects observed in Injection Moulding Process. Explain any four with its cause & remedies. 3. (i) Write various process variables in injection molding Process? (ii) Explain briefly about parison programming with neat and clean diagram. # **CENTRAL INSTITUTE OF PETROCHEMICALS ENGINEERING & TECHNOLOGY** ## **THIRD SEMESTER EXAMINATION - JANUARY - 2022** ### **PART - A** **Answer all questions** | **Question Number** | **Question** | **Answer** | |---|---|---| | 1 | Which **of the following** is not used for fixing the drawing on the board - | (d) Clips | | 2 | Which **of the following** is the lightest pencil? | (a) 2B | | 3 | As per the BIS code of specification, maximum width of the title block will be | (d) 170 mm | | 4 | Principal methods of development of surfaces are | (d) all of the above | | 5 | The size of the title block is | (d) 185 x 65 | | 6 | Which is not the use of divider? | (d) All of these | | 7 | Which **of the following** lines are used to show that the object is cut and then viewed? | (d) Hatching Lines | | 8 | Representative fraction is the | (b) The ratio of the actual length to the length in the drawing | | 9 | What is the type of scale in which the representative fraction is 1:1? | (c) Full-size scale | | 10 | In first angle projection method, the relative positions of the object, plane and observers are | (d) none of these | | 11 | A point is 20 mm above H.P. and 30 mm in front of V.P. Its top view is | (d) 30 mm above xy | | 12 | In perspective projection, picture plane is located | (a) Between the station point and the object | | 13 | Which bolt is used for lifting heavy machines? | (c) Lifting eye bolt | | 14 | The designation of sheet of size 594 x 841 is | (a) A0 | | 15 | Plumber Block is an example of | (a) Journal bearing | | 16 | _ drawing is prepared the installation or erection of a machine | - | | 17 | It is customary for the first sheet of a working drawing set to include | - | | 18 | In perspective projection, the centre of vision is the point in which the perpendicular axis pierces the _ | - | | 19 | If the slant height and base circle radius of the cone are 20 cm and 10 cm respectively. The radius of the development of the curved surface of a cone will be | - | | 20 | _ type of solid has two bases that are parallel equal polygons. | - | | 21 | The accuracy of the drawing depends on the quality of the instruments used. True/False | True/False | | 22 | 1:10000 is enlarging scale. True/False | True/False | | 23 | The perspective will remain same even if the station point changes. True/False | True/False | | 24 | A joint is said to be double-riveted, triple riveted etc. accordingly to the number of row of rivet used. True/False | True/False | | 25 | In 1st angle projection the left side view will be left side of front view. True/False | True/False | | 26 | BOM stands for | - | | 27 | ASME stands for | - | | 28 | R.F full form | - | | 29 | ANSI stands for | - | | 30 | ASSY stands for | - | ### **PART - B** **Answer all questions (Max. 40 words)** 1. Define Representative fraction in scales. 2. Define orthographic projections. 3. What is coupling? 4. Why the Projections of objects not drawn in Second and Fourth Angle of Projections? ### **PART - C** **Answer any four questions (Max. 100 words)** 1. The top view of a 75 mm long line AB measures 65 mm, while the length of its F.V. is 50 mm. Its one end A is in the H.P. and 12 mm in front of V.P. Draw the projections of line AB. 2. Make a complete orthographic drawing (with necessary number of projections) of given model and dimension it. 3. Explain the need of assembly drawing and its importance. 4. What are the different type of coupling used in assembly? Discuss it. 5. Show the symbolic representation of fasteners used in drawing. ### **PART - D** **Answer any two questions (Max. 300 words)** 1. Draw the three views of a cube 30 mm side when it is resting on its base on HP with one of the base edges making an angle of 45° to the VP. 2. A pentagon prism of 25 mm base edges and 50 mm long, resting on its base with an edge of base at 45° to the VP. The prism is cut by a section plane V.T. inclined at 30° to the HP and passes through a point 25 mm from the base along its axis. Develop its lateral surface of the truncated prism. 3. Construct a Diagonal scale of 4 meters length (RF=1/5) and show length 2.69 meter. # **CENTRAL INSTITUTE OF PETROCHEMICALS ENGINEERING & TECHNOLOGY** ## **THIRD SEMESTER EXAMINATION - JANUARY - 2022** ### **PART - A** **Answer all questions** | **Question Number** | **Question** | **Answer** | |---|---|---| | 1 | What are the tools used for mould assembly? | - | | 2 | An Alloy is a | c) mixture of metals in fixed proportion | | 3 | What is blue matching? | - | | 4 | What is spark gap? | - | | 5 | Why air vent is provided in mould? | a) To escape trapped air during injection moulding process. | | 6 | Write any one Property Required From Steels Used For Injection Moulds | - | | 7 | Define surface roughness. | - | | 8 | Difference between carbide tool & HSS tool. | - | | 9 | Mention the material used for mould bases. | - | | 10 | Which machine is used for making guide pillar? | c) Grinding | | 11 | Define non-ferrous metals. | - | | 12 | Write one factor for physical mould life. | - | | 13 | What are the elements of mould which was manufactured on lathe? | b) Cavity plate | | 14 | Use of Surface grinding in mould manufacturing is | c) both a & b | | 15 | Di-electric fluid is | a) It is an electrical conductor in liquid form | | 16 | _ are used for mould assembly. | b) Hand tools | | 17 | _ Machine is used for cutting pocket in square blocks. | c) Milling | | 18 | GD&T stands for | c) Geometric Dimensioning & Tolerancing | | 19 | The fit used for mould guide pillar and guide bush is | d) H6/h5 | | 20 | Material used for making core& cavity for long production is | d) Cast iron | | 21 | In EDM process material is removed by touching the electrode into Workpiece. True/Faslse | True/False | | 22 | Di-electric Fluid act as coolant. True/False | True/False | | 23 | Cleanliness must not be maintained during mould assembly. True/False | False | | 24 | An alloy is a mixture of metals in fixed proportion Ture /False | False | | 25 | In Insert moulding, the insert from the component is | b) Removed Automatically | | 26 | Bronze is an alloy of | b) Copper & Iron | | 27 | Which **of the following** is not an alloy? | d) Copper & Aluminium | | 28 | The rounded inside corner of a plastic product is called | c) Taper | | 29 | Spring copper is also known as | b) Cuprnickel | | 30 | _ | - | ### **PART - B** **Answer all questions (Max. 40 words)** 1. Name Few Ferrous & Non Ferrous Materials. 2. What is the function of guide pillar & guide bush? 3. Why inspection is required in the mould after assembly? 4. Write the safety precautions to be taken during grinding. ### **PART - C** **Answer any four questions (Max. 100 words)** 1. Write the suggested Tools AvailableFor Proper Tool Maintenance. 2. List out the name of mould elements, which is manufactured using CNC Lathe machine? 3. What are the different types of electrode materials used for EDM process? 4. What are the main requirements for selecting steels for making various parts of moulds? 5. List out the basic tool room machines with operations. ### **PART - D** **Answer any two questions (Max. 300 words)** 1. What is the principle of EDM? Write down the construction & working of EDM with neat sketch. 2. Mention the type of fitting used in mould assembly for parts given below. And describe the function. a.. Locating Ring b. Sprue Bush c. Push back pin d. Cavity Insert 3. What are the factors affecting the mould life? Explain in brief.