chemical engineering MCQs – Page 139

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 Review each marked answer and report any item that may be outdated or unclear.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

2761. For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by___________________?
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A. (K1 + K2+K3) CX

B. (K1 + K1) CX

C. K1CV K2CX

D. (K1 K2) CX

2762. A first order reaction requires two equal sized CSTR. The conversion is____________________?
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A. More when they are connected in series

B. Same whether they are connected in series or in parallel

C. Less when they are connected in series

D. More when they are connected in parallel

2763. With an increase in pressure in gaseous phase chemical reactions, the fractional conversion ______________ when the number of moles decreases?
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A. Decreases

B. Increases

C. Remain unaffected

D. Unpredictable from the data

2764. A stirred tank reactor compared to tubular-flow reactor provides____________________?
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A. All A., B. and C.

B. Permits operation at the optimum temperature for a long reaction time

C. Higher overall selectivity for a first order consecutive reaction

D. More uniform operating conditions

2765. Rate of a chemical reaction is not influenced by the__________________?
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A. Reactants concentration

B. Catalyst

C. Number of molecules of reactants taking part in a reaction

D. Temperature

2766. Threshold energy in a reaction is equal to the_________________?
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A. Normal energy of reactants

B. Activation energy

C. Neither A. nor B.

D. Sum of A. & B.

2767. The residence time distribution of an ideal CSTR is _____________________?
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A. exp (-t/?)

B. ? exp (-t/?)

C. (1/?) exp (-t/?)

D. (1/?) (-t/?)

2768. The rate of an autocatalytic reaction as shown in the bellow figure, is given by rA = k . CA . CB. In this case, the__________________?
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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

2769. Autocatalytic reactions are best carried out in a_________________?
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A. CSTR in series

B. Plug flow reactor

C. CSTR

D. Recycle reactor

2770. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?
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A. ction

B. Increases /decreases with pressure depending on the stoichiometric co-efficients of the

C. Increases with pressure

D. Is independent of pressure

E. Decreases with pressure

2771. Half life period of decomposition of a liquid A by irreversible first order reaction is 12 minutes. The time required for 75% conversion of A is _____________ minutes?
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A. 12

B. 24

C. 6

D. 18

2772. Higher free energy of activation of a chemical reaction (at a given temperature) implies ____________________?
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A. Slower rate of reaction

B. Higher rate of reaction

C. Higher equilibrium conversion

D. Both B. and C.

2773. Which of the following will give maximum gas conversion ?
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A. Plug-flow catalytic reactor

B. Fixed bed reactor

C. Semi-fluidised bed reactor

D. Fluidised bed reactor

2774. For the liquid phase parallel reactions__________________?
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A. Low temperature in a PFR

C. desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted

D. rR = K1.CA2; E1 = 80 KJ/mole

E. High temperature in a CSTR

F. High temperature in a PFR

2775. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the _______________ energy?
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A. Binding

B. Potential

C. Activation

D. Threshold

2776. The order of the chemical reaction as shown in the bellow figure, whose rate equation is given as -rA = KCA_________________?
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A. 3

B. CB is

C. 2

D. 0

E. 1

2777. Helium-mercury method is used for the measurement of the ________________ of the catalyst?
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A. Surface area

B. Porosity

C. Pore volume

D. Both B. & C.

2778. For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr ?
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A. 0.4

B. 0.2

C. None of these

D. 0.1

2779. The use of space time is preferred over the mean residence time in the design of a/an____________________?
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A. Slurry reactor

B. CSTR

C. Batch reactor

D. Ideal tubular-flow reactor

2780. An irreversible aqueous phase reaction, A + B ? P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed? Data: Heat of reaction = 50 kJ/mole Density of the reacting mixture = 1000kg/m3 Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition?
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A. 290

B. 190

C. 490

D. 390

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