GATE CH topic:chemical-engineering PYQs & Answers — Page 17

Questions 161–170 of 650. Imported answers require independent review unless marked reviewed.

Consider the reaction

in a continuous flow reactor under steady-state conditions. The component flow rates at the reactor inlet are

. If the fractional conversion of

is 0.60, the outlet flow rate of

, in

, rounded off to the nearest integer, is ________

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Consider a binary mixture of components

and

at temperature

and pressure

. Let

and

be the partial molar volumes of

and

, respectively. At a certain mole fraction of

The value of

, rounded off to 2 decimal places, is _______

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Consider the steady, uni-directional, fully-developed, pressure-driven laminar flow of an incompressible Newtonian fluid through a circular pipe of inner radius 5.0 cm. The magnitude of shear stress at the inner wall of the pipe is 0.1 N m

. At a radial distance of 1.0 cm from the pipe axis, the magnitude of the shear stress, in N m

, rounded off to 3 decimal places, is _____

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The opposite faces of a metal slab of thickness 5 cm and thermal conductivity 400 W m

°C

are maintained at 50 °C and 200 °C. The area of each face is 0.02 m

. Assume that the heat transfer is steady and occurs only in the direction perpendicular to the faces. The magnitude of the heat transfer rate, in kW, rounded off to the nearest integer, is _____

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The capital cost of a distillation column is Rs. 90 lakhs. The cost is to be fully depreciated (salvage value is zero) using the double-declining balance method over 10 years. At the end of two years of continuous operation, the book-value of the column, in lakhs of rupees, rounded off to 1 decimal place, is _____

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Consider a steady, fully-developed, uni-directional laminar flow of an incompressible Newtonian fluid (viscosity

) between two infinitely long horizontal plates separated by a distance

as shown in the figure. The flow is driven by the combined action of a pressure gradient and the motion of the bottom plate at

in the negative

direction. Given that

, where

and

are the pressures at two

locations separated by a distance

. The bottom plate has a velocity of magnitude

with respect to the stationary top plate at

. Which one of the following represents the

-component of the fluid velocity vector?

Diagram for Chemical Engineering question 36

Your answerChoose one option.

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The temperatures of two large parallel plates of equal emissivity are 900 K and 300 K. A reflection radiation shield of low emissivity and negligible conductive resistance is placed parallel between them. The steady-state temperature of the shield, in K, is

Your answerChoose one option.

759

559

659

859

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Hot oil at 110 °C heats water from 30 °C to 70 °C in a counter-current double-pipe heat exchanger. The flow rates of water and oil are 50 kg min

and 100 kg min

, respectively and their specific heat capacities are 4.2 kJ kg

°C

and 2.0 kJ kg

°C

, respectively. Assume the heat exchanger is at steady state. If the overall heat transfer coefficient is 200 W m

°C

, the heat transfer area in m

Your answerChoose one option.

17.9

1.1

5.2

35.2

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A solid slab of thickness

is initially at a uniform temperature

. At time

, the temperature of the top surface at

is increased to

, while the bottom surface at

is maintained at

for

. Assume heat transfer occurs only in the

-direction, and all thermal properties of the slab are constant. The time required for the temperature at

to reach 99% of its final steady value is

. If the thickness of the slab is doubled to

, and the time required for the temperature at

to reach 99% of its final steady value is

, then

Your answerChoose one option.

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A gas stream containing 95 mol% CO

and 5 mol% ethanol is to be scrubbed with pure water in a counter-current, isothermal absorption column to remove ethanol. The desired composition of ethanol in the exit gas stream is 0.5 mol%. The equilibrium mole fraction of ethanol in the gas phase,

, is related to that in the liquid phase,

, as

. Assume CO

is insoluble in water and neglect evaporation of water. If the water flow rate is twice the minimum, the mole fraction of ethanol in the spent water is

Your answerChoose one option.

0.0225

0.0126

0.0428

0.0316

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GATE CH topic:chemical-engineering PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40