List four polymeric materials.

List four polymeric materials.
by

1 Answer

Answer :

Two types of polymeric materials are :

A) Thermo plastic and B) Thermosetting plastic

A) Thermoplastics are

1. Polythene

2. Polypropylene

3. Polystyrene

4. Nylon

5. Acrylics

6. Polycarbonates

7. Acrylonitrile butadiene styrene

8. Polyvinylchloride

B) Thermosetting plastic:

Plastics using thermosetting resins

(i) Phenol-formaldehyde resins

(ii) Urea-formaldehyde resins

(iii) Melamine-formaldehyde resins

(iv) Polyester resins

(v) Epoxy resins

(vi) Silicone resins
by

Related questions

Write four properties of Ceramic Materials and give it’s applications in automobile industry.

Description : Write four properties of Ceramic Materials and give it’s applications in automobile industry.

Last Answer : Properties of Ceramic Material: i. Inorganic & non -metallic material. ii. Brittle material. iii. Insulation to flow of electric current iv. Withstand high temperature. v. Rock like appearance vi. Hardness ... mica etc. 7. In I.C. engines and turbines as armor plates. 8. In cutting tools 

The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials. (A) Non-crystalline solid (B) Crystalline (C) Rubbery (D) Non-crystalline organic polymeric

Description : The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials. (A) Non-crystalline solid (B) Crystalline (C) Rubbery (D) Non-crystalline organic polymeric

Last Answer : (D) Non-crystalline organic polymeric

Viscoelastic behaviour is observed in __________ materials. (A) Non-crystalline organic polymeric (B) Ceramic (C) All crystalline (D) All amorphous

Description : Viscoelastic behaviour is observed in __________ materials. (A) Non-crystalline organic polymeric (B) Ceramic (C) All crystalline (D) All amorphous

Last Answer : Non-crystalline organic polymeric

Which of the following is not a dielectric material? (A) Cotton, silk and paper (B) Asbestos, glass, porcelain and mica (C) Rubber and polymeric resins (D) All refractory materials

Description : Which of the following is not a dielectric material? (A) Cotton, silk and paper (B) Asbestos, glass, porcelain and mica (C) Rubber and polymeric resins (D) All refractory materials

Last Answer : Option C

Classify various types of Milling Machines. List major parts of Universal Milling Machine.

Description : Classify various types of Milling Machines. List major parts of Universal Milling Machine.

Last Answer : Classification of Milling Machine:- 1) Column and Knee Type Milling Machine a. Plain or Horizontal Milling Machine b. Hand Milling Machine c. Vertical Milling Machine d. Universal Milling Machine e. Omniversal ... Base [2]Column [3]Knee [4]Saddle [5]Table [6]Overhanging arm [7]Spindle [8]Arbor

List two important properties of Cutting Fluids.

Description : List two important properties of Cutting Fluids.

Last Answer : Properties of Cutting Fluid: 1. High heat absorption 2. Good lubricating qualities to produce low coefficient of friction 3. Low viscosity to permit free flow of liquid 4. Non-corrosive to the work or ... to the skin of operator 8. Transparency so that the cutting action of the tool may be observed 

List the basic types of rubber. Give one application of each.

Description : List the basic types of rubber. Give one application of each. 

Last Answer : Basic types of rubber with application  A) Natural rubber Applications :- 1) Belts, 2. Shoe, 3. Coatings, 4. Packaging, 5. Soles, 6. Automobile tyres, 7. Seals and gaskets, 8. Chemical ... 7. Tubeless tire liners, Inner tubes 8. Stoppers for glass bottles, 9. Medicine bottles, and pharmaceuticals 

Explain any four defects in casting and give remedies of it.

Description : Explain any four defects in casting and give remedies of it.

Last Answer : Casting Defects Remedies Shifts By ensuring proper alignment of the pattern or die part, moulding boxes, correct mounting of patterns on pattern plates, and checking of flasks, locating ... or replace core boxes, Repairs or replace core prints, Proper setting of cores. 

Enlist four properties of Magnesium AlloyAZ31 and also give it’s applictions.

Description : Enlist four properties of Magnesium AlloyAZ31 and also give it’s applictions. 

Last Answer : Properties of Magnesium AlloyAZ31: 1) An extremely light metal, 2) This alloys are of Excellent Specific Strength, 3) Excellent Sound Damping Capabilities, 4) Good ... 6) Excellent Machinability Applications: Electronics, Aerospace, Transportation Industries &Sports Industries, etc.

Write four operations performed on Lathe /machine.

Description : Write four operations performed on Lathe /machine.

Last Answer : Operations Performed on Lathe Machine are: 1. Facing, 2. Plain turning, 3. Step turning, 4. Taper turning, 5. Drilling, 6. Reaming, 7. Boring, 8. Undercutting, 9. Threading, 10. Knurling. 

Insulin exists in polymeric forms, for polymerization it requires (A) Calcium (B) Magnesium (C) Manganese (D) Zinc

Description : Insulin exists in polymeric forms, for polymerization it requires (A) Calcium (B) Magnesium (C) Manganese (D) Zinc

Last Answer : Answer : D

A polymeric unit of starch which has a branched structure is (A) Glucose (B) Amylopectin (C) Isomaltose (D) Amylose

Description : A polymeric unit of starch which has a branched structure is (A) Glucose (B) Amylopectin (C) Isomaltose (D) Amylose

Last Answer : Answer : B

A polymeric substance used to make parachute is – (1) Rayon (2) Viscose (3) Cotton (4) Terylene

Description : A polymeric substance used to make parachute is – (1) Rayon (2) Viscose (3) Cotton (4) Terylene

Last Answer : (2) Viscose Explanation: Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings shirts, shorts, coats, jackets, and other outer wear.

Which polymeric material is used for making bullet proof jacket?

Description : Which polymeric material is used for making bullet proof jacket?

Last Answer : KEVLAR

Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but (A) Polyacrylonitrile (B) Polyamide (C) Saturated polyester (D) Alkyd resin

Description : Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but (A) Polyacrylonitrile (B) Polyamide (C) Saturated polyester (D) Alkyd resin

Last Answer : (A) Polyacrylonitrile

Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

Description : Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

Last Answer : (A) Polymeric fibres are never produced by addition polymerisation

Orlan fibre which is used as a wool substitute is (A) An amorphous polymer (B) A natural polymeric fibre (C) Polyacrylonitrile (D) Poly-methyl-methacrylate (PMMA)

Description : Orlan fibre which is used as a wool substitute is (A) An amorphous polymer (B) A natural polymeric fibre (C) Polyacrylonitrile (D) Poly-methyl-methacrylate (PMMA)

Last Answer : (C) Polyacrylonitrile

Which of the following are not polymeric? (a) Proteins (b) Polysaccharides (c) Lipids (d) Nucleic acids

Description : Which of the following are not polymeric? (a) Proteins (b) Polysaccharides (c) Lipids (d) Nucleic acids

Last Answer : (c) Lipids

Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of red phosphorous is due to its polymeric structure (C) Red phosphorous is the most reactive allotropic form of phosphorous (D) Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

Description : Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of ... in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

Last Answer : (C) Red phosphorous is the most reactive allotropic form of phosphorous

Which of the following is polymeric solid? a) Nylon b) Plastic c) Polythene d) All of above

Description : Which of the following is polymeric solid? a) Nylon b) Plastic c) Polythene d) All of above

Last Answer : d) All of above

A solid is which atoms are in a regular order is called a) Crystalline solid b) Amorphous solid c) Polymeric solid d) Glassy solid

Description : A solid is which atoms are in a regular order is called a) Crystalline solid b) Amorphous solid c) Polymeric solid d) Glassy solid

Last Answer : a) Crystalline solid

Which of the following are not polymeric ? (1) Proteins (2) Polysaccharides (3) Lipids (4) Nucleic acids

Description : Which of the following are not polymeric ? (1) Proteins (2) Polysaccharides (3) Lipids (4) Nucleic acids

Last Answer : (3) Lipids

A polymeric substance used to make parachute is (1) Rayon (2) Viscose (3) Cotton (4) Terylene

Description : A polymeric substance used to make parachute is (1) Rayon (2) Viscose (3) Cotton (4) Terylene

Last Answer : Viscose

State any two advantages and disadvantages of foundry process

Description : State any two advantages and disadvantages of foundry process

Last Answer : Following are the advantages of foundry process:  i. It one of the most versatile manufacturing process. ii. Castings provide uniform directional properties. iii. Intricate shaped parts can be ... casting process, skilled operators are required. v. Internal defects are not identified easily. 

Define phase and phase diagram

Description : Define phase and phase diagram

Last Answer : Phase : A phase is defined as a homogeneous part of a system that has uniform physical and chemical properties. Pure metal is considered to be a phase. Phase diagrams are the diagrams which ... It also helps in understanding the phenomenon that occur during rapid heating and cooling of the alloy.

State the need of advanced material in making of automobile components.

Description : State the need of advanced material in making of automobile components.

Last Answer : The general finding highlights the need for developing material systems methodology and for approaching research issues in terms of material life cycles.  Improved materials and material ... Modeling of material system. Materials system research, Lightweight material for body structure.

Explain keyway milling process with standard milling cutters.

Description : Explain keyway milling process with standard milling cutters.

Last Answer : Keyway Milling Operation: This milling process produce keyway slot. The cutter use if thin size. This operation suited for long keyways. The position of the cutter is shown in figure. Standard ... and then the cut is taken. Woodruff key is produced by using a woodruff key slot cutter.

Describe the construction and working of bench drilling machine with block diagram.

Description : Describe the construction and working of bench drilling machine with block diagram.

Last Answer : Major Parts of Bench Drilling Machine : Functions of Parts: i. Base: It supports the column, which in turn, support the table and head etc. ii. Spindle: It is made up of alloy steel. It ... : It is vertical round or box section, which rests on the base and supports the head and the table.

Explain the importance of various machining parameters in improving tool life.

Description : Explain the importance of various machining parameters in improving tool life.

Last Answer : Various Machining Parameters in Improving Tool Life are: 1. Hardness and machinability of the metal to be machined. 2. Quality of heat treatment if it is steel tool. 3. Whether machining is to be done with or ... tool. 6. Depth of cut. 7. Feed to be given to the tool. 8. Cutting Speed.

Explain single point cutting tool nomenclature with sketch.

Description : Explain single point cutting tool nomenclature with sketch.

Last Answer : Single Point Cutting Tool Nomenclature: 1. Shank: The main body of the tool is known as shank. It is the backward part of tool which is hold by tool post. 2. Face: The top surface tool ... piece. 12. Nose Radius: The intersecting area of both cutting edges is known as nose of the tool.

Differential clearly between Orthogonal and Oblique Cutting

Description : Differential clearly between Orthogonal and Oblique Cutting

Last Answer : Orthogonal Cutting Oblique Cutting The cutting edge of the tool is perpendicular to the cutting velocity factor The cutting edge is inclined at an angle I' with the normal to the cutting velocity ... cutting edge in action. More than one cutting edges are in action

Describe Shell Molding Process with applications.

Description : Describe Shell Molding Process with applications.

Last Answer : Shell Moulding: It is a process in which the sand mixed with a thermosetting resin is allowed to come into contact with a heated metallic pattern plate, so that a thin and a strong shell of mould is ... 6. Gear blanks 7. Small crank shafts 8. Refrigerator valve plate 9. Chain seat bracket

Differentiate Hardening and Tempering of Automobile Parts.

Description : Differentiate Hardening and Tempering of Automobile Parts.

Last Answer : Differentiate Hardening and Tempering: Parameter Hardening Tempering Definition Hardening or quenching is the process of increasing the hardness of a material. Tempering is the process of ... a metal tempering is done to reduce the brittleness of quenched metal or alloy.

Explain induction hardening process and give it’s applications.

Description : Explain induction hardening process and give it’s applications.

Last Answer : Induction Hardening: It involves heating thin surface layer of hardenable steel and cast iron components by means of a high frequency induced current to a temperature within or above the transformation range ... [2] Crankshaft,[3] Spur gear,[4] Camshaft, [5] Cams, [6] Automobile parts 

Classify various types of molding sands and give it’s uses.

Description : Classify various types of molding sands and give it’s uses.

Last Answer : 1. Special Sand: Uses: Used for cores of brass and bronze casting, for non- ferrous castings of an intricate shape and for heavy steel casting.  2. Green sand: Uses: It is used only for simple and ... 9. Core sand: Uses: Sand used for making cores is called core sand, sometimes called, oil sand. 

Describe Carburizing Process with its applications.

Description : Describe Carburizing Process with its applications.

Last Answer : Principle of Carburizing: Carburizing is the case hardening process to obtain hard wear resistant and shock resistant case /surface and tough core inside, by introducing carbon on the steel surface by ... temperature.  Applications of Carburizing: 1) Gears 2) Camshafts 3) Bearings 4) Shafts

Explain the effect of nickel, chromium, silicon, molybdenum addition on the properties of steel.

Description : Explain the effect of nickel, chromium, silicon, molybdenum addition on the properties of steel.

Last Answer : 1) Effect of Nickel as alloying Element: i) Provides toughness, corrosion resistance, and deep hardening. ii) Increases resistance to impact iii ) Improves tensile strength 2. Effect ... temper brittleness. iv) increases strength. V0 Mo-carbides help increase creepresistance at elevated temps

Explain taper turning by using swiveling compound rest.

Description : Explain taper turning by using swiveling compound rest.

Last Answer : Taper Turning Method by Swiveling the Compound Rest: This method employs the principle of turning taper by rotating the work piece on the lathe axis and feeding the tool at an angle to the ... be fed at the angle and generate a corresponding taper. The movement of tool is controlled by hand.

Explain the importance of pattern allowances and state various pattern allowances.

Description : Explain the importance of pattern allowances and state various pattern allowances. 

Last Answer : Pattern Allowances are Important Because: 1. Solid contraction can be reduced by providing more allowance on patterns. 2. When a pattern is drawn from a mould, there is always some ... allowance iii. Machining allowance iv. Distortion or camber allowance v. Shake allowance / rapping allowance

Describe various phase transformations of iron after cooling at various rates using TTT diagram.

Description : Describe various phase transformations of iron after cooling at various rates using TTT diagram.

Last Answer : TTT is Time-Temperature-Transformation diagram. It shows the microstructures resulting from non-equilibrium cooling which is not possible on Fe-c diagram. It shows various microstructures of steels depending upon cooling rate & also the temperature and time taken for each transformation.

State various types of Cast Iron and give application of each.

Description : State various types of Cast Iron and give application of each. 

Last Answer : There are four basic types of Cast Iron - (1) White Cast Iron: Applications: Lifter Bars, Shell Liners in Grinding Mills, Pumps, Balls and Rings of Coal Pulverisers, etc. (2) Gray Cast Iron. ... Parts, Anchor of Ships, etc. (4) Malleable Cast Iron. Applications: Pots Pans and utensils, etc.

Explain Gang Milling Process.

Description : Explain Gang Milling Process.

Last Answer : Gang Milling Operation: It involves the use of a combination of more than two cutters, mounted on a common arbor, for milling a number of flat horizontal and vertical surfaces of a work piece ... . The cutting speed of a gang of cutters is calculated from the cutter of the largest diameter. 

Explain importance of Tool Life

Description : Explain importance of Tool Life

Last Answer : Tool life is a volume of material removed by a machining tool during its total usage span. The volume may be in cubic mm or cubic cm at a standard cutting speed. Importance of Tool Life: 1 ... will be profit in manufacturing processes. 2. Time saved in frequent tool changing. 3. Low inventory.

Classify various Manufacturing Processes.

Description : Classify various Manufacturing Processes. 

Last Answer : The Four main types of Manufacturing Processes are (1) Casting & Molding, (2) Machining, (3) Joining & Shearing and (4) Forming.

Draw Cooling Curve for Pure Iron and explain.

Description : Draw Cooling Curve for Pure Iron and explain.

Last Answer : Cooling Curve for Pure Iron: Figure: Cooling Curve for Pure Iron

Write two need of advanced material in Automobile Sector.

Description : Write two need of advanced material in Automobile Sector.

Last Answer : Answer:  The general finding highlights the need for developing material systems methodology and for approaching research issues in terms of material life cycles.  Improved materials and material ... material system. Materials system research, Lightweight material for body structure.

Describe flame hardening process with neat sketch.

Description : Describe flame hardening process with neat sketch.

Last Answer : Flame Hardening: The surface to be case hardened is heated by means of an oxyacetylene torch for sufficient time and Quenching is achieved by sprays of water which are integrally connected with the heating ... out where it is arranged to have the flame in progress along with quenching. 

Distinguish between annealing and normalizing process.

Description : Distinguish between annealing and normalizing process.

Last Answer : Annealing Normalizing Less hardness, toughness  Slightly more hardness, toughness.  For plain carbon steel the microstructure shows pearlite  Microstructure shows more pearlite.  ... less uniform. Internal stresses are least.  Internal stresses are slightly more 

Explain induction hardening process.

Description : Explain induction hardening process.

Last Answer : Induction hardening - The process of the surface hardening by inductive heating is known as induction hardening. A high frequency current is passed through the inductor blocks which surround the gear to ... time, the circuit is opened and water is sprayed immediately on the surface for quenching.

Compare between thermoplastic and thermosetting plastic.

Description : Compare between thermoplastic and thermosetting plastic.

Last Answer : Thermoplastics Thermosetting They can be repeated softened by heat and hardened on cooling Once hardened and set they do not softened with application of heat They are formed by ... to soft under heat  They can be used at comparatively higher temperature without damage.