GATE XE format:nat PYQs & Answers — Page 5 — Exam Papers

Questions 41–50 of 668. Imported answers require independent review unless marked reviewed.

Topic practice 668 questionsPage 5 of 67

A certain amount of plasticizer with a glass transition temperature (T_g) of −50 °C was added to a polymer to reduce its T_g from 70 °C to 30 °C. Using the Fox equation, the weight fraction of the plasticizer used 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 answer

A rectangular plastic specimen with a cross-sectional area of 240 mm

is subjected to tension with a force of 1500 N resulting in elastic deformation. If the Young’s modulus of the specimen is 34.55 MPa, the value of strain 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 answer

Equimolar mixture of terephthalic acid and butylene glycol was taken to synthesize a polyester. The reaction was stopped at 99.6% conversion of the acid monomer. The weight average molecule weight (

) of the synthesised polyester is ______________ g/mol (rounded off to the nearest integer).

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 answer

A viscoelastic polymer is subjected to a constant strain of 0.3. The behavior of the polymer follows Maxwell model of linear viscoelasticity. Elastic modulus of the polymer is 5 MPa and the relaxation time is 200 days. The stress in the polymer after 100 days from the initial application of the strain is ______________ MPa (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 answer

A single-screw extruder is operated at 12 rpm under open discharge condition (i.e., without a die).

The screw has a diameter of 10 cm, a distance of 2.5 cm between the adjacent flights, a gap of 0.25 cm between the screw and the inner wall of the barrel, and a helix angle (i.e., angle between the flights and the plane perpendicular to the screw axis) of 8°.

If the flow of the molten polymer in the metering zone through the extruder is assumed isothermal, Newtonian and incompressible, the volumetric flow rate of the polymer melt is ______________ cm

/min (rounded off to the nearest integer).

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 answer

Water is flowing at 100 litres/min through a pipe with a diameter of 5 cm. Assume the coefficient of viscosity of water to be 0.001 Pa.s and the density to be 1000 kg/m

. The Reynolds number for this flow is ________ (Round off to nearest integer)

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 answer

A wet solid, fed to a dryer at a rate of 5 kg/s, is dried using hot air. In this process its moisture content is reduced from 25% to 15%. The rate of moisture removal is ______ kg/s. (Round 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 answer

Hot oil is being cooled in a countercurrent, double-pipe heat exchanger from 410 K to 340 K by chilled water entering at 290 K and exiting the exchanger at 330 K. The Log Mean Temperature Difference (LMTD) for this heat transfer is ________ K. (Round off to one decimal place)

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 answer

A cold-storage room has a double-layered wall. The inner layer is 10 cm thick, made of fiber insulation board (k = 0.048 W m⁻¹ K⁻¹), and the outer layer is 15 cm thick, made of concrete (k = 0.762 W m⁻¹ K⁻¹). The surface temperature of the wall inside the cold room is 260 K and the ambient temperature outside is 300 K. The steady state heat flux into the cold room is __________ W/m². (Round 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 answer

A tubular centrifuge separates 5 micron particles of density 1500 kg/m³ from a slurry. The slurry is fed at a volumetric flow rate of 0.5 m³/s. The equivalent clarification area of the centrifuge is ______ m². (Answer in integer)

Assume g = 10 m/s² and for water, density = 1000 kg/m³, coefficient of viscosity (μ) = 10⁻³ Pa-s

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 answer