Engineering Sciences
GATE XE Polymer Characterization PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–26 of 26. Imported answers require independent review unless marked reviewed.
Question 21
Open questionXE-FNAT2 marksNeeds review
If 49 moles of hexamethylene diamine is reacted with 50 moles of adipic acid to prepare Nylon 66, then the number average molecular weight, M̅_n of the resulting polymer at 99.5% conversion (ignoring contribution from end groups) is ______ g mol⁻¹ (round off to 2 decimal places).
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Open questionXE-FMCQ1 markNeeds review
The order of average molecular weights of a polymer is
Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
Storage modulus and tan
of a polymer are experimentally measured byYour answerChoose one option.
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Open questionXE-FMCQ2 marksNeeds review
The two characterization techniques which can be used to determine degree of crystallinity of a polymer are
P. Scanning Electron Microscopy
Q. Thermogravimetric Analysis
R. Wide Angle X-Ray Diffraction
S. Differential Scanning Calorimetry
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 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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