GATE CH 2021 Paper 1 — page 18

Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.

Seawater is passed through a column containing a bed of resin beads. Density of seawater = 1025 kg m

Density of resin beads = 1330 kg m

Diameter of resin beads = 50 μm Void fraction of the bed at the onset of fluidization = 0.4 Acceleration due to gravity = 9.81 m s

The pressure drop per unit length of the bed at the onset of fluidization is ________ Pa m

(round off to nearest integer).

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A straight fin of uniform circular cross section and adiabatic tip has an aspect ratio (length/diameter) of 4. If the Biot number (based on radius of the fin as the characteristic length) is 0.04, the efficiency is ________ % (round off to nearest integer).

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A double-effect evaporator is used to concentrate a solution. Steam is sent to the first effect at 110 °C and the boiling point of the solution in the second effect is 63.3 °C. The overall heat transfer coefficient in the first effect and second effect are 200 W m

and 1500 W m

, respectively. The heat required to raise the temperature of the feed to the boiling point can be neglected. The heat flux in the two evaporators can be assumed to be equal.

The temperature at which the solution boils in the first effect is ________ °C (round off to nearest integer).

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2021 · Paper 1

Question 42

Question 43

Question 44