GATE CH kind:question PYQs & Answers — Page 16

Questions 151–160 of 650. Imported answers require independent review unless marked reviewed.

Two parallel first-order liquid phase reactions

and

are carried out in a well-mixed isothermal batch reactor. The initial concentration of A in the reactor is 1 kmol m

, while that of B and C is zero. After 2 hours, the concentration of A reduces to half its initial value, and the concentration of B is twice that of C. The rate constants

and

, in h

, are, respectively

Your answerChoose one option.

0.40, 0.20

0.23, 0.12

0.50, 0.25

0.36, 0.18

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Consider the block diagram in the figure with control input

, disturbance

and output

. For the feedforward controller, the ordered pair

Diagram for Chemical Engineering question 22

Your answerChoose one option.

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Consider the control structure for the overhead section of a distillation column shown in the figure. The composition controller (CC) controls the heavy key impurity in the distillate by adjusting the setpoint of the reflux flow controller in a cascade arrangement. The sign of the controller gain for the pressure controller (PC) and that for the composition controller (CC) are, respectively,

Diagram for Chemical Engineering question 23

Your answerChoose one option.

negative, negative

negative, positive

positive, positive

positive, negative

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Which one of the given statements is correct with reference to gas-liquid contactors for mass transfer applications?

Your answerChoose one option.

A tray tower is more suitable for foaming systems than a packed tower.

Tray towers are preferred over packed towers for systems requiring frequent cleaning.

For a given liquid flow rate, the gas flow rate in the loading region is greater than that in the flooding region.

Flooding can never occur for counter-current contact.

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In an ammonia manufacturing facility, the necessary hydrogen is generated from methane. The facility consists of the following process units -

P: Methanator, Q: CO shift converter, R: CO

stripper, S: Reformer, T: Ammonia converter

The correct order of these units, starting from methane feed is

Your answerChoose one option.

S, Q, R, P, T

P, Q, R, S, T

S, P, Q, R, T

P, S, T, Q, R

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Consider a linear homogeneous system of equations

, where

is an

matrix,

is an

vector and

is an

null vector. Let

be the rank of A. For a non-trivial solution to exist, which of the following conditions are/is satisfied?

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

Determinant of A = 0

Determinant of A ≠ 0

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If the Prandtl number

, which of the following statements is/are correct?

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

The moment diffusivity is much larger than the thermal diffusivity.

The thickness of the momentum boundary layer is much smaller than that of the thermal boundary layer.

The thickness of the momentum boundary layer is much larger than that of the thermal boundary layer.

The momentum diffusivity is much smaller than the thermal diffusivity.

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For the electrolytic cell in a chlor-alkali plant, which of the following statements is/are correct?

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

A membrane cell operates at a higher brine concentration than a diaphragm cell.

Chlorine gas is produced at the cathode.

Hydrogen gas is produced at the cathode.

The caustic product stream exits the anode compartment.

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Which of the following statements with reference to the petroleum/petrochemical industry is/are correct?

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

Catalytic hydrocracking converts heavier hydrocarbons to lighter hydrocarbons.

Catalytic reforming converts straight-chain hydrocarbons to aromatics.

Cumene is manufactured by the catalytic alkylation of benzene with propylene.

Vinyl acetate is manufactured by reacting methane with acetic acid over a palladium catalyst.

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Consider a matrix

, where

is a constant. If the eigenvalues of

are

and

, then the value of

, rounded off to the nearest integer, is __________

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GATE CH kind:question PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30