GATE XE format:nat PYQs & Answers — Page 51 — Exam Papers

Questions 501–510 of 668. Imported answers require independent review unless marked reviewed.

Topic practice 668 questionsPage 51 of 67

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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A single screw extruder is to be used to manufacture a nylon rod of 0.5 cm diameter at a production rate of 2.5 cm s⁻¹. The density of solid nylon and nylon melt are 1.140 g cm⁻³ and 0.790 g cm⁻³, respectively. The melt flow rate through the die is ______ cm³ s⁻¹ (round off to two decimal places).

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An ice cream mix of 870 g L⁻¹ has been used to prepare ice cream which yielded a finished product of 490 g L⁻¹. The per cent over run is ________ (round off to 1 decimal place).

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Impeller in a fruit juice mixing tank is rotating at 200 rpm with a Reynolds number >10^4. Density of juice is 1045 kg m^-3. If diameter of the impeller is doubled and other conditions remained constant, the power requirement of mixing will increase by a factor of ______.

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Paddy consisting of 20% husk has been milled to remove 6% bran during polishing. Assuming no other losses, yield (percent) of polished rice from the paddy is ________ (round off to 1 decimal place).

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Buffalo milk having density of 1030 kg m⁻³ is homogenized with a pressure of 30 MPa. Given, acceleration due to gravity as 9.81 m s⁻² and assuming no pressure loss, the velocity (m s⁻¹) of the milk flowing through the homogenizer valve will be ______ (round off to 2 decimal places).

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Potato slices have been dehydrated from an initial solid content of 12% to a final solid content of 94%. If the peeling and other losses are to the tune of 10%, final yield (per cent) of the dried chips per ton of fresh potato taken is ______ (round off to 2 decimal places).

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A mixed fruit beverage with 12 °Brix having specific heat of 4298 J kg⁻¹ K⁻¹ is being heated from 30 °C to 95 °C for pasteurization at a flow rate of 1000 L h⁻¹ in a tubular heat exchanger. Steam at 100 °C is used as heating medium which is converted into condensate at 100 °C. If the density of beverage is 1075 kg m⁻³ and the latent heat of steam at the given temperature is 2257 kJ kg⁻¹, the mass flow rate of steam (kg min⁻¹) is ______ (round off to 2 decimal places).

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Fruit juice was cooled in a tubular heat exchanger from 50 °C to 7 °C using water at 2 °C, which gets heated to 5 °C. Assume, Pr = 0.72, Re = 2000 and thermal conductivity = 0.6 W m⁻¹ °C⁻¹ and no viscous effect. If pipe diameter was 10 cm, the convective heat transfer coefficient (W m⁻² °C⁻¹) is ________ (round off to 1 decimal place).

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Room air is at 40 °C with 60% relative humidity. Saturated vapour pressure of water at 40 °C is 7.375 kPa. Volume of humid air (m³ per kg of dry air) is ____________ (round off to 3 decimal places).

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