chemical engineering MCQs – Page 159

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

3161. The conductivity of crude oil-water mixture depends on the__________________?
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A. Temperature

B. All A., B. and C.

C. Water percentage

D. pH value

3162. For a heterogeneous catalytic reaction____________________?
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A. The surface of the catalyst does not play an important role during reaction

B. end of reaction</strong>

C. ch does not mean that catalyst concentration is important

D. A relatively small amount of catalyst can cause the conversion of large amount of reactants

E. Free energy of activation is lowered in the presence of catalyst, which remains unchanged at

F. The catalyst does not form an intermediate complex with the reactant

3163. The rate equation for the reaction represented by as shown in the bellow figure, is given by rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively___________________?
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A. First order & K1/K2

B. First order & K1

C. Zero order & K1

D. Zero order & K1/K2

3164. Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?
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A. 1

B. 3

C. 0

D. 2

3165. For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?
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A. Fluidised

B. Fixed bed reactor followed by a fluidised

C. Fixed

D. Fluidised bed reactor followed by a fixed

3166. In a/an ______________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation?
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A. Adiabatic

B. Non-adiabatic

C. Isothermal

D. None of these

3167. The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) ? C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?
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A. k KAKB pApB / (1 + KApA + KBpB + KCpC)2

B. k KAKB pApB / (1 + KApA + KBpB)

C. k KAKB pApB / (1 + KApA + KBpB + KCpC)

D. k KA pApB / (1 + KApA + KBpB)

3168. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called_________________?
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A. None of these

B. Relative yield

C. Selectivity

D. Operational yield

3169. For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be ______________ times?
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A. 8-Jan

B. 16-Jan

C. 16

D. 8

3170. Which of the following does not require preheating during storage in the storage tank as well as during atomisation through burners ?
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A. PCM

B. Tar

C. Low viscosity furnace oil

D. Light diesel oil

3171. From among the following, choose one which is not an exothermic process ?
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A. Ammonia synthesis

B. Catalytic cracking

C. Methanol synthesis

D. Oxidation of sulphur

3172. When the reaction is dominated by intraparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as ________________?
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A. nD = n + 1

B. None of these

C. nD = n/2

D. nD = (n + 1)/2

3173. Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH ? C2H4 + H2O 2C2H5OH ? C2H5 O C2H5 + H2O The percent conversion of ethanol in the reactor is________________?
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A. 2.5

B. 100

C. 95

D. 97.5

3174. If in the gaseous phase reaction, N2O4 ? 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be___________________?
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A. (1 x)

B. (1 x)2

C. (1 + x)

D. (1 + x)2

3175. With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)?
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A. Decreases

B. Remain same

C. Increases linearly

D. Increases

3176. A reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?
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A. Catalytic

B. Autocatalytic

C. Photochemical

D. None of these

3177. True vapour pressure of a petroleum fraction ________________ Reid vapour pressure?
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A. Is less than

B. Is same as

C. Is more than

D. May be either more or less than

3178. In an ideal tubular-flow reactor_________________?
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A. There is a uniform velocity across the radius

B. There is no mixing in longitudinal direction

C. All A., B. and C.

D. Mixing takes place in radial direction

3179. Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its_________________?
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A. Molecular weight

B. Aromatics content

C. Both A. & B.

D. Neither a nor b

3180. Glycol added to petrol acts as a/an ________________ agent ?
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A. Dewaxing

B. Anti-knocking

C. Anti-icing

D. Anti-gum forming

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