Engineering Sciences
GATE XE topic:engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 501–510 of 1772. Imported answers require independent review unless marked reviewed.
Question 129
Open questionXE-FNAT2 marksNeeds review
For a polymer solution, the dependence of viscosity (
) on shear rate (
) is described by the three-parameter Carreau model given by
where,
,
, and
are the three parameters of the model. Here, all three parameters are positive quantities. As the shear rate increases from 1 s
to 100 s
, the viscosity of the polymer solution decreases by a factor of 10. For a polymer solution with
and
Pa s, the value of the parameter
is ______ s (rounded off to two decimal places).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 130
Open questionXE-FNAT2 marksNeeds review
The dilute solution viscometry data for two samples of a polymer with two different molecular weights are shown in the figure, where
has been plotted against
. Here,
is the specific viscosity and
is the mass concentration of the polymer solution. The slopes and intercepts of the plots for both the samples are shown in the figure. The plotted data for both samples are described by the Huggins equation of dilute solution. The value of the Mark-Houwink constant ‘a’ for both polymer samples is 0.5.
The ratio of the viscosity-average molecular weight (
) of polymer sample 1 to that of polymer sample 2, i.e.,
, is ______ (rounded off to two decimal places). 
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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 131
Open questionXE-FNAT2 marksNeeds review
The linear viscoelastic behavior of a polymer is described by the Kelvin-Voigt model consisting of a spring element of elastic modulus 10 MPa in parallel with a dashpot of viscosity 3.6 × 10
Pa s. A fixed stress of 40 MPa is suddenly applied to the polymer and maintained thereafter. The value of the strain after one hour from the sudden application of the stress is ______ (rounded off to two decimal places).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 132
Open questionXE-GMCQ1 markNeeds review
Which one of the following fungi produces aflatoxins?
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 133
Open questionXE-GMCQ1 markNeeds review
Under standard conditions in animal feeding studies, the weight gained (in grams) per gram of protein consumed by an animal is termed as
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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 134
Open questionXE-GMCQ1 markNeeds review
Xerophthalmia is caused due to the deficiency of
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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 135
Open questionXE-GMCQ1 markNeeds review
Which one of the following steps is used to remove phosphatides from crude oil in the refining process?
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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 136
Open questionXE-GMCQ1 markNeeds review
The unique flavor of chocolate and cocoa is due to the formation of
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Open questionXE-GMCQ1 markNeeds review
Which one of the following statements regarding Hazard Analysis Critical Control Point (HACCP) plan is NOT correct?
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Open questionXE-GMCQ1 markNeeds review
The product of cabbage fermentation by Leuconostoc mesenteroides is
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