chemical engineering MCQs – Page 162

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 Review each marked answer and report any item that may be outdated or unclear.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

3221. Enzymes are destroyed, when the_______________?
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A. Temperature is very high

B. Reactants concentration is very high

C. Reaction rate is independent of the reactants concentration

D. Reactants concentration is very low

3222. From Arrhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is___________________?
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A. k cal. K

B. k cal/K

C. k cal

D. K

3223. Which of the following has maximum hydrogen/carbon ratio (by weight) ?
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A. Fuel oil

B. Gasoline

C. Naphtha

D. Diesel

3224. Transition state theory relates the above quantities as___________________?
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A. k ? e-E/RT

B. k ? T.eE/RT

C. k ? ?T

D. k ? T1.5

3225. An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is ___________________?
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A. Maximum at the exit of the reactor

B. Maximum at the centre of the reactor

C. Maximum at the inlet of the reactor

D. Constant throughout the reactor

3226. Which of the following reactions is undesirable in the production of catalytically reformed gasoline ?
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A. Isomerisation of paraffins

B. Dehydrogenation of lower paraffins

C. Dehydrogenation of Naphthene

D. Dehydrocyclization of higher paraffins

3227. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ?
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A. Diameter of the reactor

B. Time

C. Useful volume of the tank

D. None of these

3228. Specific rate constant for a second order reaction__________________?
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A. Is independent of temperature

B. Varies with temperature

C. Depends on the nature of the reactants

D. Both B. and C.

3229. A catalyst in a chemical reaction _______________ free energy change in the reaction?
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A. Increases

B. Decreases

C. Either A. or B.; depends on the type of catalyst

D. Neither A. nor B.

3230. For a first order chemical reaction, the rate constant_________________?
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A. Is not a function of the unit of time

B. Has unit of time-1

C. Changes on changing the concentration units

D. None of these

3231. At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500K and 400K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of E/R? ?
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A. 1.6

B. 2.5

C. 2

D. 2.24

3232. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature ?
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A. Chemical reaction

B. Pore diffusion

C. Ash layer diffusion

D. Film diffusion

3233. Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in ______________ in conversion?
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A. Either A. or B., depends on the type of reaction

B. No change

C. Decrease

D. Increase

3234. In a semi-batch reactor __________________?
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A. Condition similar to plug flow reactor exists

B. Velocity of reaction can be controlled

C. Residence time is constant

D. Mixing takes place in axial direction only

3235. 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?
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A. 32

B. 3-Jan

C. 3

D. 1

3236. The effect of increasing pressure on the gaseous equilibrium of the reaction 2X + 3Y ? 3X + 2Y indicates that____________________?
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A. Pressure has no effect

B. Forward reaction is favoured

C. Backward reaction is favoured

D. None of these

3237. Catalyst carriers___________________?
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A. Provide large surface area with a small amount of active material

B. Inhibit catalyst poisoning

C. Increase the activity of a catalyst

D. Have very high selectivity

3238. The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are_______________?
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A. 2 & 2

B. 11 & 2

C. 2 & 1

D. 1 & 1

3239. The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the__________________?
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A. Kinetics of the reaction

B. Temperature of the system

C. Presence or absence of inerts

D. Pressure of the system

3240. Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?
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A. Increasing the concentration of one or more of the products

B. None of these

C. Removal of at least one of the products at regular interval

D. Increasing the concentration of one of the reactants

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