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GATE 2015 : Engineering Sciences [Section F]

4 pages, 22 questions, 7 questions with responses, 8 total responses,    0    0
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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

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