GATE CH topic:chemical-engineering PYQs & Answers — Page 60

Questions 591–600 of 650. Imported answers require independent review unless marked reviewed.

The volumetric properties of two gases M and N are described by the generalized compressibility chart which expresses the compressibility factor (

) as a function of reduced pressure and reduced temperature only. The operating pressure (

) and temperature (

) of two gases M and N along with their critical properties (

) are given in the table below.

Gas	(bar)	(K)	(bar)	(K)
M	25	300	75	150
N	75	1000	225	500

and

are the compressibility factor of the gases M and N under the given operating conditions, respectively. The relation between

and

Your answerChoose one option.

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Water is heated at atmospheric pressure from 40°C to 80°C using two different processes. In process I, the heating is done by a source at 80°C. In process II, the water is first heated from 40°C to 60°C by a source at 60°C, and then from 60°C to 80°C by another source at 80°C.

Identify the correct statement.

Your answerChoose one option.

Enthalpy change of water in process I is greater than enthalpy change in process II

Enthalpy change of water in process II is greater than enthalpy change in process I

Process I is closer to reversibility

Process II is closer to reversibility

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In a venturi meter,

and

are the pressure drops corresponding to volumetric flowrates

and

. If

, then

equals

Your answerChoose one option.

0.5

0.25

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The thickness of laminar boundary layer over a flat plate varies along the distance from the leading edge of the plate. As the distance increases, the boundary layer thickness

Your answerChoose one option.

increases

decreases

initially increases and then decreases

initially decreases and then increases

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Which of the following is the correct sequence of equipment for size reduction of solids?

Your answerChoose one option.

Diagram for Chemical Engineering question 10

Diagram for Chemical Engineering question 10 (figure 2)

Diagram for Chemical Engineering question 10 (figure 3)

Diagram for Chemical Engineering question 10 (figure 4)

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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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The one-dimensional unsteady heat conduction equation is

where

– temperature,

– time,

– radial position,

– thermal conductivity,

– density, and

– specific heat.

For the cylindrical coordinate system, the value of

in the above equation is

Your answerChoose one option.

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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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Which of the following conditions are valid at the plat point? P) Density difference between the extract and raffinate phases is zero Q) Interfacial tension between the extract and raffinate phases is zero R) Composition difference between the extract and raffinate phases is zero

Your answerChoose one option.

P and Q only

Q and R only

P and R only

P, Q and R

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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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GATE CH topic:chemical-engineering PYQs

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Question 15