GATE CH format:nat PYQs & Answers — Page 23

Questions 221–230 of 252. Imported answers require independent review unless marked reviewed.

Topic practice 252 questionsPage 23 of 26

The humidity of air at a dry-bulb temperature of 65 °C is 0.025 kg water/kg dry air. The latent heat of vaporization of water at 0 °C is 2500 kJ/kg. The psychrometric ratio of air is 0.95 kJ (kg dry air)⁻¹ K⁻¹. Considering 0 °C as reference temperature, the enthalpy of air (in kJ/kg) at its adiabatic saturation temperature of 35 °C is ____________ (rounded off to two decimal places).

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In a roll crusher, rolls of diameter 1 m each are set in such a manner that minimum clearance between the crushing surfaces is 15 mm. If the angle of nip is 31°, the maximum diameter of the particle (in mm) which can be crushed is __________ (rounded off to third decimal place).

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A hot liquid is to be cooled in a 1-1 shell and tube heat exchanger from 80 °C to 50 °C. Cooling water enters the tube side at 30 °C, and exits at 45 °C. The properties of the liquids are constant. Also, the overall heat transfer coefficient is same for counter-current and co-current modes. The percentage saving in heat transfer area for counter-current option with respect to the area of co-current option is __________ (rounded off to third decimal place).

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The value of

is _____.

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The real part of

is _____.

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The number of positive roots of the function

shown below in the range

is .

Diagram for Chemical Engineering question 3

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A gas bubble (gas density

kg/m³; bubble diameter

m) is rising vertically through water (density

kg/m³; viscosity

Pa.s). Force balance on the bubble leads to the following equation,

where

is the velocity of the bubble at any given time

. Assume that the volume of the rising bubble does not change. The value of

m/s².

The terminal rise velocity of the bubble (in cm/s), rounded to 2 decimal places, is ______ cm/s.

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In a heat exchanger, the inner diameter of a tube is 25 mm and its outer diameter is 30 mm. The overall heat transfer coefficient based on the inner area is 360 W/m²·°C. Then, the overall heat transfer coefficient based on the outer area, rounded to the nearest integer, is ______ W/m²·°C.

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The composition of vapour entering a tray in a distillation column is 0.47. The average composition of the vapour leaving the tray is 0.53. The equilibrium composition of the vapour corresponding to the liquid leaving this tray is 0.52. All the compositions are expressed in mole fraction of the more volatile component.

The Murphree efficiency based on the vapour phase, rounded to the nearest integer, is ______ %.

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The cost of a new pump (including installation) is 24,000 Rupees. The pump has a useful life of 10 years. Its salvage value is 400 Rupees. Assuming straight line depreciation, the book value of the pump at the end of 4th year, rounded to the nearest integer, is ______ Rupees.

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GATE CH format:nat PYQs

Question 53

Question 54

Question 55

Question 1

Question 2

Question 3

Question 11

Question 13

Question 15

Question 22