chemical engineering MCQs – Page 152

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 Review each marked answer and report any item that may be outdated or unclear.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
3021. Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3 ? CaO + CO2), the pressure of CO2 increases, if____________________?
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A. None of these

B. A catalyst is added

C. The temperature is increased

D. An inert gas is pumped keeping the temperature constant

3022. In a/an _____________ vessel, the fluid enters and leaves following plug flow?
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A. Open-closed

B. Closed

C. Close-opened

D. Open

3023. Antioxidants are added in petrol to _____________________?
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A. Prevent the lead build up in engines

B. Minimise the gum formation

C. Impart colour to it, for easy identification

D. Prevent icing of the carburettor

3024. In an ideal mixed reactor (at steady state), the ___________________?
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A. Exit stream has the same composition as the fluid within the reactor

B. All A., B. and C.

C. Space time is equivalent to holding time for constant density systems

D. Composition throughout the reactor remains same

3025. Sum of the powers of the concentration terms in the rate equation is called the _____________ of the reaction?
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A. Overall order

B. None of these

C. Order

D. Molecularity

3026. 1 centistoke is equal to ______________ Redwood I seconds?
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A. 1

B. 0.408

C. 4.08

D. 40.8

3027. The vacuum maintained in vacuum distillation unit for reduced crude is about _______________ mm Hg?
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A. 700

B. 120

C. 12

D. 1.2

3028. According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction _________________?
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A. k ? T e-E/RT

B. k ? ?T

C. k ? e-E/RT

D. None of these

3029. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of _______________ order?
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A. Second

B. First

C. None of these

D. Zero

3030. For an isothermal second order aqueous phase reaction, A ? B, the ratio of the time required for 90% conversion to the time required for 45% conversion is____________________?
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A. 4

B. 2

C. 22

D. 11
3031. At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) ? CO(g) + 3H2(g), CO(g) + H2O(g) ? CO2(g) + H2(g) CH4(g) + 2H2O(g) ? CO2(g) + 4H2(g) Then K1, K2 and K3 are related as ?
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A. K3(K1+K2)/2

B. K3 = K1.K2

C. K3 = (K1.K2)0.5

D. K3 = (K1.K2)2

3032. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
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A. Large reactor followed by smaller one

B. Data insufficient, cant be predicted

C. Either of the arrangement A. or B. will give the same yield

D. Smaller reactor followed by larger one

3033. In case of _____________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds?
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A. Parallel

B. Auto catalytic

C. Catalytic

D. Series

3034. N plug flow reactors in series with a total volume V gives the same conversion as a single plug flow reactor of volume V for _______________ order reactions?
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A. First

B. Third

C. Second

D. Any
3035. When all the limiting reactant is consumed in the reaction, the operational yield _______________ the relative yield?
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A. Equals

B. Is greater than

C. Can be either greater or smaller than (depends on the type of reaction)

D. Is smaller than

3036. An autothermal reactor is_________________?
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A. Completely self-supporting in its thermal energy requirements

B. Most suitable for a second order reaction

C. Most suitable for a reversible reaction

D. Isothermal in nature

3037. The rate of reaction of a/an ______________ reaction is not affected by temperature rise ?
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A. Zero order

B. Autocatalytic

C. Consecutive

D. Photochemical
3038. For the chemical reaction P ? Q, it is found that the rate of reaction doubles as the concentration of P is doubled. If the reaction rate is proportional to Cp n, then what is the value of n for this chemical reaction ?
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A. 3

B. 0

C. 2

D. 1
3039. Cracking is___________________?
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A. An exothermic reaction

B. None of these

C. Favoured at very low temperature

D. An endothermic reaction
3040. Reforming converts_________________?
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A. Olefins into paraffins

B. Naphthenes into paraffin

C. Naphthenes into olefins

D. Naphthenes into aromatics