GATE CH exam:gate PYQs & Answers — Page 23

Questions 221–230 of 650. Imported answers require independent review unless marked reviewed.

A packed distillation column, with vapor having an average molecular weight of 45 kg·mol⁻¹, density of 2 kg·m⁻³ and a molar flow rate of 0.1 kmol·s⁻¹, has a flooding velocity of 0.15 m·s⁻¹. The column is designed to operate at 60 % of the flooding velocity. Which one of the following is the CORRECT value for the column diameter (in m)?

Your answerChoose one option.

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An isothermal jacketed continuous stirred tank reactor (CSTR) operating at 150 °C is shown in the figure below. The cold feed entering the system at 30 °C is preheated to a temperature

(

°C) using a heat exchanger

. This preheated feed is further heated to 150 °C using the utility heater

. The mass flow rate and heat capacity are same for all the process streams, and the overall heat transfer coefficient is independent of temperature. Which one of the following statements is the CORRECT action to take if it is desired to increase the value of

Diagram for Chemical Engineering question 27

Your answerChoose one option.

Increase both heat transfer area of

and heat duty of

Decrease both heat transfer area of

and heat duty of

Increase the heat transfer area of

and decrease the heat duty of

Decrease the heat transfer area of

and increase the heat duty of

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Consider a system where a Carnot engine is operating between a source and a sink. Which of the following statements about this system is/are NOT correct?

Your answerSelect all correct options. You can choose more than one.

This engine is reversible.

The engine efficiency is independent of the source and sink temperatures.

This engine has the highest efficiency among all engines that operate between the same source and sink.

The total entropy of this system increases at the completion of each cycle of the engine.

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For a fully developed turbulent flow of an incompressible Newtonian fluid through a pipe of constant diameter, which of the following statements is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

Reynolds stress, averaged over a sufficiently long time, is zero everywhere inside the pipe.

Reynolds stress at the pipe wall is zero.

Average velocity of the fluid is half of its center-line velocity.

Average pressure gradient in the flow direction is constant.

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Given that

(in W·m

) is the total hemispherical emissive power of a surface maintained at a certain temperature, which of the following statements is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

does not depend on the direction of the emission.

depends on the viewer.

depends on the wavelength of the emission.

does not depend on the frequency of the emission.

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The position

of a particle, at constant

, is described by the equation

The initial conditions are

and

. The position of the particle at

is __________ (in integer).

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Burning of methane in a combustor yields carbon monoxide, carbon dioxide, and water vapor. Methane is fed to the combustor at 100 mol·hr

, of which 50 % reacts. The theoretical oxygen requirement (in mol·hr

) is ________ (rounded off to one decimal place).

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The viscosity of an incompressible Newtonian fluid is measured using a capillary tube of diameter 0.5 mm and length 1.5 m. The fluid flow is laminar, steady and fully developed. For a flow rate of 1 cm

·s

, the pressure drop across the length of the tube is 1 MPa. If the viscosity of the fluid is

Pa·s, the value of

is __________ (rounded off to two decimal places).

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A liquid

containing a dissolved gas

is stripped in a countercurrent operation using a pure carrier gas

. The liquid phase inlet and outlet mole fractions of

are 0.1 and 0.01, respectively. The equilibrium distribution of

between

and

is governed by

, where

and

are the mole fractions of

and

, respectively. The molar feed rate of the carrier gas stream is twice that of the liquid stream. Under dilute solution conditions, the minimum number of ideal stages required is __________ (in integer).

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In a binary gas-liquid system,

is the molar flux of a gas A for equimolar counter diffusion with a liquid B.

is the molar flux of A for steady one component diffusion through stagnant B. Using the mole fraction of A in the bulk of the gas phase as 0.2 and that at the gas-liquid interface as 0.1 for both the modes of diffusion, the ratio of

is equal to _____ (rounded off to two decimal places).

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GATE CH exam:gate PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35