Chemical Reaction MCQs

188 MCQs — Chemical Engineering MCQs (Page 10 of 19)

Attempt Chemical Reaction Quiz

For series reaction, the relative yield__________________?

A. Is always greater for plug-flow reactor than for the single cstr of the same volume
B. Statement in a. is wrong
C. Decreases with increasing conversion
D. Both a. and c. hold good

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The rate of a homogeneous reaction is a function of__________________?

A. Temperature and pressure only
B. Temperature and composition only
C. Pressure and composition only
D. All temperature, pressure and composition

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The rate of the reaction, X → Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cx n, the value of ‘n’ in this case will be_______________________?

A. 0
B. 1
C. 2
D. 3

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In case of a P.F.R., there__________________________?

A. May be lateral mixing of fluid
B. Should not be any mixing along the flow path
C. Both a. and b.
D. Neither a. nor b.

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For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?

A. A dirac delta function
B. A step function
C. A ramp function
D. None of the above

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An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________________?

A. Be more in cstr than in pfr
B. Be more in pfr than in cstr
C. Be same in both cases
D. Depend on the temperature

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Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ?

A. 100
B. 150
C. 200
D. 225

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The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________________?

A. Dxa/dt = k1 (1 – xa)2 (1 + 2xa)
B. Dxa/dt = k1 (1 – xa) (1 + 0.5xa)
C. Dxa/dt = k1 (1 – xa)
D. Dxa/dt = k1 (1 – xa)/(1 + xa)

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Fluid flow in a real packed bed can be approximated as ________________ model?

A. Plug flow
B. Dispersion
C. Mixed flow
D. Tank in series

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The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________?

A. Plot of – ra vs ca is a straight line with slope k
B. Plot of – ra vs ca is a hyperbola
C. Rate of disappearance of reactant a is maximum, where ca = cb
D. Both b & c

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