Engineering Sciences
GATE XE year:2017 PYQs
Build your understanding with focused practice from past exam papers.
Questions 111–120 of 175. Imported answers require independent review unless marked reviewed.
Question 111
Open questionXE-FNAT2 marksNeeds review
The density of polyethylene crystals is 998 kg/m³ and that of totally amorphous polyethylene is 886 kg/m³. If the density of a polyethylene sample is 949 kg/m³, the crystallinity in volume fraction is ____ % (round off final answer to two digits after decimal place).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 112
Open questionXE-FNAT2 marksNeeds review
The polydispersity index of a polymer sample containing 200 molecules each of molecular weight 10,000 gmol⁻¹, 300 molecules each of molecular weight 30,000 gmol⁻¹ and 500 molecules each of molecular weight 50,000 gmol⁻¹ is ______ (round off final answer to two digits after decimal place).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 113
Open questionXE-FMCQ2 marksNeeds review
Match the following rubber additives to their function:
Additive
P. Dicumyl peroxide
Q. Pentachlorothiophenol
R. ZnO with stearic acid
S. Zinc diethyldithiocarbamate
Function
Ultrafast accelerator
Activator
Curing agent
Peptizer
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 114
Open questionXE-FNAT2 marksNeeds review
A composite of polypropylene reinforced with 20% by volume of glass fibre is to be prepared. If the density of glass fibre is 2540 kg/m³ and polypropylene is 900 kg/m³, then the mass of glass fibre required per kg of composite is ______ g (round off answer to the nearest whole number).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 115
Open questionXE-FMCQ2 marksNeeds review
Match the following terminology to the appropriate polymer processing technique:
Terminology
P. Die-swell
Q. Breathing
R. Plug-assisted
S. Mastication
Process Technique
Two roll mill mixing
Thermoforming
Extrusion
Compression moulding
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 116
Open questionXE-FMCQ2 marksNeeds review
Match the polymer in Column A to its application in Column B:
Column A
P. Nylon
Q. Polyethylene
R. Cis-1,4-polyisoprene
S. Acrylonitrile-butadiene-styrene
Column B
Television cabinet
Tyre
Mechanical gear
Packaging
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 117
Open questionXE-FNAT2 marksNeeds review
For the polycondensation of equimolar amounts of adipic acid with hexamethylene diamine, if the number average degree of polymerization is 100, then the extent of reaction is ______ %.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 118
Open questionXE-FNAT2 marksNeeds review
The relaxation time for a rubber band at 23 °C is 60 days. If it is stressed to 2 MPa initially, then the time required before the stress relaxes to 1 MPa is ______ days (round off final answer to two digits after decimal point).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 119
Open questionXE-FMCQ2 marksNeeds review
Match the processing technique in Column A to the corresponding shear rate (s⁻¹) in Column B:
Column A
P. Injection Molding
Q. Extrusion
R. Calendering
S. Compression Molding
Column B
1-10
10-100
100-1000
1000-10000
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 120
Open questionXE-FNAT2 marksNeeds review
Given T_g of polymer A is 100 °C and that of polymer B is -100 °C, then the T_g of a miscible blend of A and B containing 30 wt% of A is ______ °C (round off final answer to a single digit after decimal point).
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