GATE CH format:mcq PYQs & Answers — Page 33

Questions 321–330 of 378. Imported answers require independent review unless marked reviewed.

Segmental baffles in a 2-4 shell and tube heat exchanger

Your answerChoose one option.

change the flow pattern of the tube side fluid and increase the overall heat transfer coefficient

increase the heat transfer coefficient in the shell side and support the tubes

help to reduce the thermal expansion of the tubes and increase the heat transfer coefficient in the tube side

increase the number of passes in the shell side and increase the heat transfer coefficient in the tube side

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In connection with petroleum refining, identify the incorrect statement among the following options.

Your answerChoose one option.

Desalting of crude oil is done before process it in atmospheric distillation unit

A stream of hydrogen is produced in catalytic reforming of naphtha

Asphalt used for pave is a petroleum product

Cetane number indicates the quality of petrol / motor spirit

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Polyvinyl chloride is produced by

Your answerChoose one option.

co-polymerization

addition-type kinetics

reacting chlorine with polyethylene

reacting hydrochloric acid with polyethylene

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The molecular formula of the predominant chemical compound in commercial sugar is

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Two packed towers are designed for the same mass velocity of the gas. The first has liquid and gas flow rates of 30 kg/s and 1.2 kg/s, respectively, while the corresponding flow rates in the second tower are 67.5 kg/s and 1.8 kg/s. The ratio of the design diameter of the wider tower to that of the narrower tower is

Your answerChoose one option.

1.8

1.5

1.225

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The Annual Fixed Charges (AFC) and Annual Utilities Costs (AUC) of a distillation column being designed are expressed in terms of the reflux ratio (R) as

The reflux ratio (

) for optimizing the total cost of the distillation column may be found by solving

Your answerChoose one option.

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Consider the following properties: (P) temperature (Q) specific gravity (R) chemical potential (S) volume The option which lists ALL the intensive properties is

Your answerChoose one option.

P and Q

P, Q and R

P, Q, R and S

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Liquid phase isomerization of o-xylene to p-xylene using a zeolite catalyst was carried out in a CSTR. Three sets of kinetic data at different temperatures and stirring speeds were obtained as shown below.

	set A			set B			set C
temperature (K)	500	500	500	600	600	600	700	700	700
stirring speed (rpm)	1000	2000	3000	1000	2000	3000	1000	2000	3000
reaction rate (mol L⁻¹ s⁻¹)	0.020	0.025	0.025	0.037	0.047	0.047	0.069	0.078	0.086

The operating condition at which the reaction rate is not controlled by external mass transfer resistance is

Your answerChoose one option.

T = 500 K; rpm = 3000

T = 600 K; rpm = 1000

T = 700 K; rpm = 1000

T = 700 K; rpm = 2000

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Choose the correct statement

In viscose rayon manufacturing process,

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carbon disulfide used as reactant for xanthate formation is regenerated in a later step

caustic soda used as reactant for steeping of cellulose is regenerated in a later step

sulfuric acid is used in steeping process of cellulose

the spun viscose rayon is hardened in an alkali bath

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The reactant (M) is converted into product (N) in the presence of catalyst in a fixed bed reactor. All the flow rates (F, G, H, P and R) in mol/s, and mole fraction of reactant (M) in these streams (x_F, x_G, x_H, x_P and x_R) are shown in the diagram.

Diagram for Chemical Engineering question 17

The overall fractional conversion is

Your answerChoose one option.

(x_G G − x_H H)/(x_G G)

(x_G G − x_P P)/(x_G G)

(x_F F − x_H H)/(x_F F)

(x_F F − x_P P)/(x_F F)

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GATE CH format:mcq PYQs

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