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GATE 2015
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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)
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(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
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(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
(B) cresol
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(C) styrene
(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
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(A) poly(acrylic acid)
(B) Nylon 6
(C) poly(ethylene terephthalate)
(D) Nylon 66
Q.7 Which among the following are used as initiators for free radical polymerization?
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P. K2SO4
Q. K2S2O8
R. AIBN
S. t-Butyl hydroperoxide + Fe2+
(A) P, Q & R only
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(B) Q, R & S only
(C) P, R & S only
(D) P, Q, R & S
Q.8 Weight average molecular weight can be determined by
(A) Osmometry
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(B) Ebulliometry
(C) End group analysis
(D) Light scattering
Q.9 Butyl rubber is a copolymer of
(A) Isobutylene and butadiene
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(B) Butadiene and 1-butene
(C) Isobutylene and isoprene
(D) Isoprene and 1-butene
Q. 10 – Q. 22 carry two marks each.
Q.10 Match the characterization technique with the polymer property it is used to determine
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| Technique | Property |
|---|---|
| P. X-ray diffraction | 1. Melting temperature |
| Q. Differential scanning calorimetry | 2. Crystallinity & crystal size |
| R. Thermogravimetric analysis | 3. Glass transition temperature |
| S. Dynamic mechanical analysis | 4. Ash content |
(A) P-3; Q-1; R-4; S-2
(B) P-3; Q-4; R-2; S-1
(C) P-2; Q-4; R-1; S-3
(D) P-2; Q-1; R-4; S-3
Q.11 Match the following plastic additives with their function
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| Additive | Function |
|---|---|
| P. Di-isooctyl phthalate | 1. Antioxidant |
| Q. 4-Methyl-2,6-t-butylphenol | 2. Plasticizer |
| R. Dicumyl peroxide | 3. Antistatic agent |
| S. Quaternary ammonium compound | 4. Cross-linking agent |
(A) P-2; Q-4; R-1; S-3
(B) P-4; Q-1; R-3; S-2
(C) P-2; Q-1; R-4; S-3
(D) P-3; Q-1; R-4; S-2
Q.12 The correct statement with respect to electrical property of polymeric materials is
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(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
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(A) Nylon 66 > PTFE > Nylon 6 > PP
(B) Nylon 66 > Nylon 6 > PTFE - PP
(C) PTFE > Nylon 66 > Nylon 6 PP
(D) PTFE > Nylon 6 > Nylon 66 > PP
Q.14 Match the processing technique used to manufacture the appropriate product
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| Processing Technique | Product |
|---|---|
| P. Calendering | 1. Pipes |
| Q. Extrusion | 2. Disposable cups |
| R. Injection Molding | 3. Sheets |
| S. Thermoforming | 4. Nylon gears |
(A) P-3; Q-2; R-1; S-4
(B) P-3; Q-1; R-2; S-4
(C) P-3; Q-1; R-4; S-2
(D) P-3; Q-2; R-4; S-1
Q.15 Match the thermosetting resins to the raw materials they are synthesized from
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| Resin | Raw material |
|---|---|
| P. Epoxy | 1. Cresol + furfural |
| Q. Phenolic | 2. Diethylene glycol + diallyl phthalate |
| R. Unsaturated polyester | 3. Bisphenol A + epichlorohydrin |
| S. Allyl | 4. Maleic acid + 1,2-propylene glycol |
(A) P-4; Q-2; R-3; S-1
(B) P-3; Q-1; R-2; S-4
(C) P-3; Q-2; R-1; 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
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Q.17 A styrene-butadiene random copolymer with equal weight fraction of polystyrene (T₇ = 100 °C) and polybutadiene (T₇= -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 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 | Application |
|---|---|
| P. EPDM | 1. Golf balls |
| Q. Polyurethane | 2. Fuel transfer hose |
| R. Nitrile rubber | 3. Cable insulation |
| S. Polybutadiene | 4. Footwear |
(A) P-3; Q-4; R-2,; S-1
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(B) P-4; Q-3; R-2; S-1
(C) P-3; Q-2; R-4; S-1
(D) P-1; Q-4; R-2; S-3
Q.21 Match the following reagents to their function in natural rubber latex technology
| Reagent | Function |
|---|---|
| P. Ammonia | 1. Prevent storage hardening |
| Q. Hydroxylamine | 2. Delay plugging mechanism |
| R. Formic acid | 3. Stabilizer |
| S. Ethephone | 4. Coagulating agent |
(A) P-3; Q-1; R-2; S-4
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(B) P-3; Q-2; R-4; S-1
(C) P-3; Q-1; R-4; S-2
(D) P-3; Q-4; R-1; S-2
Q.22 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
END OF THE QUESTION PAPER
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