chemical engineering MCQs – Page 153

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 Review each marked answer and report any item that may be outdated or unclear.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
3041. Reactions with high activation energy are_____________________?
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A. Very temperature sensitive

B. Always reversible

C. Always irreversible

D. Temperature insensitive

3042. In an exothermic chemical reaction, the reactants compared to the products have__________________?
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A. Same energy

B. Higher temperature

C. Less energy

D. More energy
3043. In which of the following gaseous phase reversible reactions, the product yield cannot be increased by the application of high pressure ?
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A. PCl3 + Cl2 ? PCl5

B. N + 3H2 ? 2NH3

C. 2SO2 + O2 ? 2SO3

D. N2 + O2 ? 2NO
3044. Clay treatment is used to remove ___________________ ?
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A. Salt from the crude oil

B. Wax from lube oil

C. Colour & dissolved gases from cracked gasoline

D. None of these

3045. Smoke point of a good burning kerosene may be around _______________ mm?
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A. 60-75

B. 0-5

C. 20-25

D. 100-120

3046. Velocity of a reaction depends upon the_________________?
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A. Nature of the reactants

B. Concentration of the reactants

C. Temperature at which the reaction is carried

D. All A., B. and C.
3047. Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as_________________?
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A. DE = DN/DE

B. DE = DM . DE

C. DE = DM + DK

D. 1/DE = 1/DN + DK
3048. High aniline point of a petrofuel (say diesel) indicates that ________________?
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A. It has a very low diesel index

B. It is highly paraffinic in nature

C. Its ignition quality is very poor

D. It is highly aromatic in nature

3049. A catalyst loses its activity due to__________________?
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A. Covering of the catalytic active sites by a foreign substance

B. Loss in surface area of the active component

C. All A., B. and C.

D. Agglomeration of metal particles caused by thermal sintering of the solid surface

3050. With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of R in mixed reactor (for a given conversion of A) ?
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A. Increases linearly

B. Increases

C. Decreases

D. Remain same

3051. Octane number of n-heptane is assumed to be_________________?
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A. ?

B. 0

C. 70

D. 100

3052. Chemical reaction rate of a component depends upon the______________________?
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A. Temperature of the system

B. Pressure of the system

C. All A., B. and C.

D. Composition of the component only

3053. In the gaseous phase ammonia formation reaction (N2 + 3H2 ? 2NH3), the value of the equilibrium constant depends on the_________________?
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A. Total pressure of the system

B. Temperature

C. Initial concentration of N2 and H2

D. Volume of the reactor

3054. With increase in initial concentration, the fractional conversion of a first order reaction in a given time___________________?
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A. Decreases

B. Increases

C. Remain constant

D. Unpredictable

3055. Hydrocracking employs ___________________?
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A. High temperature and low pressure

B. High pressure & temperature

C. High pressure and low temperature

D. Low pressure & temperature

3056. An imbalanced chemical reaction equation is against the law of________________?
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A. Constant proportion

B. Multiple proportion

C. None of these

D. Conservation of mass
3057. From collision theory, the reaction rate constant is proportional to_________________?
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A. Tm exp (-E/RT)

B. ?T

C. exp (-E/2RT)

D. exp (-E/RT)

3058. In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) ?
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A. A + N

B. A N

C. A

D. N

3059. The rate constant of a first order reaction depends on the ________________?
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A. Temperature

B. Concentration of the product

C. Time

D. Concentration of the reactant

3060. Design of heterogamous catalytic reactor involves consideration of _______________ steps?
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A. Only chemical

B. Only physical

C. Both A. & B.

D. Neither A. nor B.