GATE CH 2023 Paper 1 — page 17

Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.

Wet air containing 10 mole percent water vapor is dried by continuously passing it through a column of CaCl

pellets. The pellets remove 50 percent of water from wet air entering the column. The mole percent of water vapor in the product stream exiting the column is __________ (rounded off to two decimal places).

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Orsat analysis showing the composition (in mol %, on a dry basis) of a stack gas is given in the table below. The humidity measurement reveals that the mole fraction of H

O in the stack gas is 0.07. The mole fraction of N

calculated on a wet basis is _______ (rounded off to two decimal places).

Species	N	CO	CO	O
mol %	65	15	10	10

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A pump draws water (density = 1000 kg·m

) at a steady rate of 10 kg·s

. The pressures at the suction and discharge sides of the pump are −20 kPa (gauge) and 350 kPa (gauge), respectively. The pipe diameters at the suction and discharge side are 70 mm and 50 mm, respectively. The suction and discharge lines are at the same elevation, and the pump operates at an efficiency of 80 %. Neglecting frictional losses in the system, the power (in kW) required to drive the pump is _____ (rounded off to two decimal places).

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2023 · Paper 1

Question 49

Question 50

Question 51