GATE XE format:nat PYQs & Answers — Page 31 — Exam Papers

Questions 301–310 of 668. Imported answers require independent review unless marked reviewed.

Topic practice 668 questionsPage 31 of 67

The amount of low molecular weight plasticizer with a

of -60 °C that must be added to nylon 6 to reduce its

from 50 °C to 30 °C is ________ % (round off to nearest integer).

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The enthalpy of fusion for a polymer is found to decrease from 135.6 J g

to 120 J g

after five years of use. If the enthalpy of fusion of the same polymer with 100% crystallinity is 290 J g

, then the loss in crystallinity after five years is ______ % (rounded off to one decimal place).

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One hundred kg paddy is dried from 18% wet basis to 13% wet basis moisture content. The amount of water removed (in kg) from the paddy is ________ (round off to one decimal place).

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The radius of a centrifuge bowl is 0.1 m and is rotating at 850 revolutions per minute. The centrifugal force developed in terms of gravity force (g-force) is ________ (round off to two decimal places).

Given: Acceleration of gravity (g) = 9.81 m s

and π = 3.14

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In a canning industry, the total process time (F

) was calculated as 3 min. If each can contains 20 spores having decimal reduction time of 1.6 min, the probability of spoilage would be ______ in 100 cans (round off to the nearest integer).

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In sieve analysis of coffee powder, the particle size distribution is given below.

Number of particles Mean particle size (μm) 5 40 8 30 50 20 90 17.5 148 12.5 10 10

The Sauter mean diameter (in μm) of the coffee powder is ______ (round off to one decimal place).

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In a dairy processing plant, milk enters a 30 m long and 2 cm diameter tube at 60 °C and leaves at 57 °C. The total heat loss over the tube length is 381.5 W. The specific heat capacity, density, and viscosity of milk are 3.85 kJ kg⁻¹ K⁻¹, 1020 kg m⁻³, and 1.20 cP, respectively. The Reynolds number for the flow is ______ (round off to the nearest integer).

Given: π = 3.14

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Apple juice flows through a steel pipe having thermal conductivity of 50 W m⁻¹ K⁻¹. The outer surface of pipe is exposed to ambient environment. The inside diameter and thickness of the pipe are 3 cm and 1.5 cm, respectively. The overall heat transfer coefficient based on inside area is 25 W m⁻² K⁻¹. If the internal convective heat transfer coefficient is 30 W m⁻² K⁻¹, the external convective heat transfer coefficient (in W m⁻² K⁻¹) will be ________ (round off to two decimal places).

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The dry bulb temperature and relative humidity of air inside a storage chamber are 37 °C and 50%, respectively. The saturation pressure of water vapour at 37 °C and barometric pressure are 6.28 kPa and 101.32 kPa, respectively. The humidity ratio of air inside the chamber is ______ kg water (kg dry air)⁻¹ (round off to three decimal places).

Given: Molecular weight of water vapour and dry air are 18.02 g mol⁻¹ and 28.97 g mol⁻¹, respectively.

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The Rossby number of a synoptic system with a length scale of 1000 km, characteristic velocity scale of 10 m s⁻¹ at a latitude where the Coriolis parameter equals 10⁻⁴ s⁻¹, is ______. (Round off to two decimal places)

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