Chemical Engineering MCQs

Page No. 554

Carbon particles accumulated on the catalyst used in the gas oil cracking lies in the category of _____________________ poison?


aDeposited

✓


bChemisorbed

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cSelectivity

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dStability

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View Answer Deposited

For an ideal plug flow reactor, the value of Peclet number is_______________?


a0

✓


b1

✖


c10

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d∞

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View Answer 0

In a reversible reaction, a catalyst increases the rate of forward reaction__________________?


aOnly

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bTo a greater extent than that of the backward reaction

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cAnd decreases that of the backward reaction

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dAnd the backward reaction equally

✓



In an ideal mixed reactor (at steady state), the ___________________?


aSpace time is equivalent to holding time for constant density systems

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bComposition throughout the reactor remains same

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cExit stream has the same composition as the fluid within the reactor

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dAll A., B. and C.

✓


View Answer All A., B. and C.

The importance of diffusion in a catalyst are increased by ____________________?


aLarge catalyst particle sizeAn active surface of the catalyst

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bAn active surface of the catalyst

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cSmall pore diameter

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dAll A., B. and C.

✓


View Answer All A., B. and C.

A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is ______________ seconds?


a1

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b3

✓


c1/3

✖


d32

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View Answer 3

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


aIncreases

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bDecreases

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cRemain constant

✓


dUnpredictable

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View Answer Remain constant

The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are_______________?


a2 & 1

✓


b11 & 2

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c2 & 2

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d1 & 1

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View Answer 2 & 1

Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature ?


aPore diffusion

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bFilm diffusion

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cAsh layer diffusion

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dChemical reaction

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View Answer Film diffusion

The temperature dependence of reaction rate constant (K) by Arrhenius law is given by_______________?


aK α e-E/RT

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bK α eE/RT

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cK α T . e-E/RT

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dK α √T . e-E/RT

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View Answer K α e-E/RT

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