Chemical Engineering MCQs

Page No. 573

The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _____________________?


aAt the inlet

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bAt the outlet

✓


cIn the reactor

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dAveraged over the inlet and outlet

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View Answer At the outlet

Molecularity of an elementary reaction, P + Q → R + S is ____________________?


a1

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b2

✖


c3

✖


d4

✓


View Answer 4

The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ∫∞ 0 E.dt is____________________?


a0

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b1

✓


c∞

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d√2π

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View Answer 1

Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?


atan hT/T

✓


btan T/T

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ctan hT/tan T

✖


dNone of these

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View Answer tan hT/T

Photo-chemical reactions occur in presence of ___________________?


aSunlight

✓


bDarkness

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cSolid catalysts

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dMonochromatic radiation only

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View Answer Sunlight

The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?


a0.875

✓


b0.5

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c0.425

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dData insufficient to calculate

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View Answer 0.875

The heat of reaction__________________?


aDepends on the pressure only

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bDepends on the mechanism of reaction only

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cDepends on both pressure and mechanism of reaction

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dIs independent of the mechanism of reaction

✓



Space velocity____________________?


aDescribes the extensive operating characteristics of a tubular flow reactor

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bIs the maximum feed rate per unit volume of reactor for a given conversion

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cIs a measure of the ease of the reaction

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dAll A., B. and C.

✓


View Answer All A., B. and C.

A chemical reaction occurs, when the energy of the reacting molecules is ________________ the activation energy of reaction?


aLess than

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bEqual to

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cMore than

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dEqual to or more than

✓


View Answer Equal to or more than

For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?


aZero

✓


bFirst

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cSecond

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dFractional

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View Answer Zero

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