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GATE 2015 : Engineering Sciences [Section F]

4 pages, 22 questions, 7 questions with responses, 8 total responses,

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GATE 2015 POLYMER SCIENCE AND ENGINEERING XE-F F : POLYMER SCIENCE AND ENGINEEIRING Q. 1 Q. 9 carry one mark each. Q.1 The biodegradable polymer among the following polymers is (A) poly(lactic acid) (B) poly(butylene terephthalate) (C) polystyrene (D) polypropylene Q.2 Notched impact strength of a plastic decreases with (A) increase in notch tip radius (B) increase in notch depth (C) increase in temperature (D) decrease in notch depth Q.3 The compound used as a reactive diluent in unsaturated polyester resins is (A) benzene (C) styrene (B) cresol (D) adipic acid Q.4 The diameter of a die of an extruder producing extrudate of diameter 2.4 mm with a die-swell ratio of 2 is _______mm. Q.5 The degree of polymerization of Nylon 6 (ignore end-groups) with molar mass of 1,00,000 g mol 1 is ______. Q.6 The polymer synthesized by ring opening polymerization is (A) poly(acrylic acid) (C) poly(ethylene terephthalate) Q.7 Which among the following are used as initiators for free radical polymerization? P. K2SO4 Q. K2S2O8 (A) P, Q & R only (C) P, R & S only Q.8 S. t-Butyl hydroperoxide + Fe2+ (B) Q, R & S only (D) P, Q, R & S (B) Ebulliometry (D) Light scattering Butyl rubber is a copolymer of (A) Isobutylene and butadiene (C) Isobutylene and isoprene XE-F R. AIBN Weight average molecular weight can be determined by (A) Osmometry (C) End group analysis Q.9 (B) Nylon 6 (D) Nylon 66 (B) Butadiene and 1-butene (D) Isoprene and 1-butene 1/4 GATE 2015 POLYMER SCIENCE AND ENGINEERING XE-F Q. 10 Q. 22 carry two marks each. Q.10 Match the characterization technique with the polymer property it is used to determine Technique P. X-ray diffraction Q. Differential scanning calorimetry R. Thermogravimetric analysis S. Dynamic mechanical analysis (A) P-3; Q-1; R-4; S-2 (C) P-2; Q-4; R-1; S-3 Q.11 (B) P-3; Q-4; R-2; S-1 (D) P-2; Q-1; R-4; S-3 Match the following plastic additives with their function Additive P. Di-isooctyl phthalate Q. 4-Methyl-2,6-t-butylphenol R. Dicumyl peroxide S. Quaternary ammonium compound (A) P-2; Q-4; R-1; S-3 (C) P-2; Q-1; R-4; S-3 Q.12 Property 1. Melting temperature 2. Crystallinity & crystal size 3. Glass transition temperature 4. Ash content Function 1. Antioxidant 2. Plasticizer 3. Antistatic agent 4. Cross-linking agent (B) P-4; Q-1; R-3; S-2 (D) P-3; Q-1; R-4; S-2 The correct statement with respect to electrical property of polymeric materials is (A) For non-polar materials, dielectric constant is independent of frequency & temperature (B) For polar materials, dielectric constant depends on frequency but not on temperature (C) For non polar materials, power losses are high and depend on temperature & frequency (D) For polar materials, power losses are low and independent of frequency Q.13 The order of melting point for the given polymers is (A) Nylon 66 (B) Nylon 66 (C) PTFE (D) PTFE Q.14 > > > > PTFE Nylon 6 Nylon 66 Nylon 6 > > > > Nylon 6 PTFE Nylon 6 Nylon 66 PP PP PP PP Match the processing technique used to manufacture the appropriate product Processing Technique P. Calendering Q. Extrusion R. Injection Molding S. Thermoforming (A) P-3; Q-2; R-1; S-4 (C) P-3; Q-1; R-4; S-2 XE-F > > > > Product 1. Pipes 2. Disposable cups 3. Sheets 4. Nylon gears (B) P-3; Q-1; R-2; S-4 (D) P-3; Q-2; R-4; S-1 2/4 GATE 2015 Q.15 POLYMER SCIENCE AND ENGINEERING XE-F Match the thermosetting resins to the raw materials they are synthesized from Resin P. Epoxy Q. Phenolic R. Unsaturated polyester S. Allyl Raw material 1. Cresol + furfural 2. Diethylene glycol + diallyl phthalate 3. Bisphenol A + epichlorohydrin 4. Maleic acid + 1,2-propylene glycol (A) P-4; Q-2; R-3; S-1 (C) P-3; Q-2; R-1; S-4 (B) P-3; Q-1; R-2; S-4 (D) P-3; Q-1; R-4; S-2 Q.16 The damping factor of a solid polymer under sinusoidal loading in single cantilever mode showing 80 percent recovery in modulus is _____. Q.17 A styrene-butadiene random copolymer with equal weight fraction of polystyrene (T g = 100 C) and polybutadiene (T g = 100 C) shows a single glass transition peak. The Tg of the copolymer is _____ C. Q.18 In a unidirectional carbon fibre reinforced epoxy composite, the ratio of fibre-to-matrix moduli is 30 and the fibres take up 50% of the cross-section. The percentage of applied force taken up by the fibres is _____. Q.19 The viscoelastic behavior of a plastic is represented by spring and dashpot elements having constants of 2 GN m 2 and 90 GN s m 2, respectively. If a constant stress of 12 MN m 2 is applied, the strain predicted by Maxwell model after 50 s is _____ %. Q.20 Match the elastomers given below to their suitable application Elastomer P. EPDM Q. Polyurethane R. Nitrile rubber S. Polybutadiene (A) P-3; Q-4; R-2,; S-1 (C) P-3; Q-2; R-4; S-1 Q.21 P. Ammonia Q. Hydroxylamine R. Formic acid S. Ethephone (A) P-3; Q-1; R-2; S-4 (C) P-3; Q-1; R-4; S-2 XE-F 1. Golf balls 2. Fuel transfer hose 3. Cable insulation 4. Footwear (B) P-4; Q-3; R-2; S-1 (D) P-1; Q-4; R-2; S-3 Match the following reagents to their function in natural rubber latex technology Reagent Q.22 Application Function 1. Prevent storage hardening 2. Delay plugging mechanism 3. Stabilizer 4. Coagulating agent (B) P-3; Q-2; R-4; S-1 (D) P-3; Q-4; R-1; S-2 1.0 g of a polybutadiene sample with carboxylic acid groups at both the ends requires 2.5 mL of 0.1 M KOH for complete neutralization. The molecular weight of the polymer in g mol 1 is _____. 3/4 GATE 2015 POLYMER SCIENCE AND ENGINEERING XE-F END OF THE QUESTION PAPER XE-F 4/4

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