GATE CH format:mcq PYQs & Answers — Page 18

Questions 171–180 of 378. Imported answers require independent review unless marked reviewed.

Catalytic reform is commonly used in the petroleum industry to improve fuel quality. The undesirable reaction in the catalytic reforming of naphtha is

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Hydrocracking of paraffins

Dehydrogenation of naphthenes

Isomerization of naphthenes

Cyclization of paraffins

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A control system on the jacket side of a reactor is shown in the figure. Pressurized water flows through the jacket to cool the reactor. The heated water flashes in the boiler. The exothermic reaction heat thus generates steam. Fresh boiler feed water (BFW) is added to make-up for the loss of water as steam. Assume that all control valves are air-to-open. The controller action, ‘direct’ or ‘reverse’, is defined with respect to the controller. Select the option that correctly specifies the action of the controllers.

Diagram for Chemical Engineering question 21

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PC: Reverse, LC: Direct, TC: Reverse

PC: Direct, LC: Reverse, TC: Direct

PC: Direct, LC: Reverse, TC: Reverse

PC: Reverse, LC: Direct, TC: Direct

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Liquid flowing through a heat exchanger (HX) is heated. A bypass stream is provided to control the temperature of the heated exit stream. From the given plumbing options, the one that provides the most effective temperature control for large disturbances while avoiding vaporization in the heat exchanger is

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Diagram for Chemical Engineering question 22

Diagram for Chemical Engineering question 22 (figure 2)

Diagram for Chemical Engineering question 22 (figure 3)

Diagram for Chemical Engineering question 22 (figure 4)

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The appropriate feedforward compensator,

, in the shown block diagram is

Diagram for Chemical Engineering question 23

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Choose the option that correctly pairs the given measurement devices with the quantities they measure. The table lists: I — Bourdon Gauge; II — Orifice Plate meter; III — Pyrometer; IV — Colorimeter; V — Pirani Gauge. Quantities: A — Temperature; B — Concentration; C — Pressure; D — Flow rate; E — Liquid level.

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I-E II-C III-D IV-B V-A

I-C II-D III-A IV-B V-C

I-C II-D III-E IV-A V-D

I-D II-C III-A IV-E V-C

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A simple distillation column is designed to separate an ideal binary mixture to specified distillate and bottoms purities at a given column pressure. If RRₘᵢₙ is the minimum reflux ratio for this separation, select the statement that is NOT CORRECT with regard to the variation in the total annualized cost (TAC) of the column with reflux ratio (RR).

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TAC has a minimum with respect to RR

The sharpest rise in TAC occurs as RR approaches RRₘᵢₙ from above

The sharpest decrease in TAC occurs as RR approaches RRₘᵢₙ from above

TAC increases with RR for RR ≫ RRₘᵢₙ

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The reaction

is carried out isothermally on a porous catalyst. The intrinsic reaction rate is

, where

is the rate constant and

is the concentration of

. If the reaction is strong pore-diffusion controlled, the observed order of the reaction is

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In an enzymatic reaction, an inhibitor (I) competes with the substrate (S) to bind with the enzyme (E), thereby reducing the rate of product (P) formation. The competitive inhibition follows the reaction mechanism shown below. Let [S] and [I] be the concentration of S and I, respectively, and

be the rate of consumption of S. Assuming pseudo-steady state, the correct plot of

Diagram for Chemical Engineering question 27

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Diagram for Chemical Engineering question 27 (figure 2)

Diagram for Chemical Engineering question 27 (figure 3)

Diagram for Chemical Engineering question 27 (figure 4)

Diagram for Chemical Engineering question 27 (figure 5)

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The partial differential equation

where,

and

, is subjected to the following initial and boundary conditions:

The value of

at which

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moles of an ideal gas undergo a two-step process as shown in the figure. Let

and

denote the pressure, volume and temperature of the gas, respectively. The gas, initially at state-1 (

), undergoes an isochoric (constant volume) process to reach state-A, and then undergoes an isobaric (constant pressure) expansion to reach state-2 (

). For an ideal gas,

, where

and

are the heat capacities at constant pressure and constant volume, respectively, and are assumed to be temperature independent. The heat gained by the gas in the two-step process is given by

Diagram for Chemical Engineering question 37

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GATE CH format:mcq PYQs

Question 20

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Question 22

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Question 26

Question 27

Question 36

Question 37