chemical engineering MCQs – Page 160

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 Review each marked answer and report any item that may be outdated or unclear.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

3181. A batch adiabatic reactor at an initial temperature of 373K is being used for the reaction, A ? B. Assume the heat of reaction is 1kJ/mole at 373K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be ____________?
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A. 20C

B. 5C

C. 100C

D. 10C

3182. A batch reactor is suitable for__________________?
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A. Obtaining uniform polymerisation products in highly exothermic reactions

B. Achieving cent percent conversion of reactants into products

C. Large scale gaseous phase reactions

D. Liquid phase reactions

3183. The energy balance equation over a tubular reactor under transient conditions is________________?
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A. A linear partial differential equation

B. An ordinary non-linear differential equation

C. A non-linear partial differential equation

D. An algebraic differential equation

3184. ______________ is the response curve for a step input signal from a reactor ?
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A. S-curve

B. C-curve

C. I-curve

D. None of these

3185. The half life period of a first order reaction is given by (where, K = rate constant) ?
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A. 2.5 K

B. 0.693/K

C. 1.5 K

D. 6.93 K

3186. A photochemical reaction is _______________?
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A. Catalysed by light

B. Accompanied with emission of light

C. Initiated by light

D. All A., B. & C.

3187. Catalyst used in the catalytic polymerisation is__________________?
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A. Aluminium chloride

B. Nickel

C. Phosphoric acid on kieselguhr

D. Vanadium pentoxide

3188. LPG when brought to atmospheric pressure & temperature will be a________________?
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A. Gas lighter than air

B. Liquid heavier than water

C. Liquid lighter than water

D. Gas heavier than air

3189. Pick out the wrong statement ?
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A. In general, the rate of a reaction becomes triple for every 10C rise in temperature

B. In a multistep reaction, the slowest step is the rate determining step

C. Molecularity of a reaction cannot be zero but the order of a reaction can be zero

D. Slow chemical reactions have generally high values of activation energy

3190. Which of the following is the easiest to crack ?
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A. Naphthenes

B. Aromatics

C. Olefins

D. Paraffins

3191. Which of the following is not an important property of fuel oil/furnace oil ?
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A. Aniline point

B. Viscosity

C. Sulphur content

D. Flash point

3192. For the chemical reaction X ? Y, it is observed that, on doubling the concentration of X, the reaction rate quadruples. If the reaction rate is proportional to Cx n, then what is the value of n? ?
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A. 4

B. 4-Jan

C. 2

D. 16

3193. Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about_________________?
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A. 3.5

B. 2.5

C. 1

D. 0.1

3194. A catalyst______________________?
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A. Is capable of reacting with any one of the reactants

B. Initiates a reaction

C. Cannot be recovered chemically unchanged at the end of a chemical reaction

D. Lowers the activation energy of reacting molecules

3195. There is no correspondence between stoichiometric and the rate equation in case of a/an _____________ reaction?
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A. Multiple

B. Elementary

C. Autocatalytic

D. Non-elementary

3196. Char value of Kerosene is the amount of charred oil deposition on the wick obtained after burning it in a standard wick lamp at a standard rate for 24 hours. Char value of a good quality kerosene should be less than ________________ mg/kg of kerosene?
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A. 1

B. 20

C. 100

D. 500

3197. The rate constant of a chemical reaction decreases by decreasing the____________________?
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A. Concentration of reactants

B. Duration of reaction

C. Temperature

D. Pressure

3198. The units of frequency factor in Arrhenius equation_________________?
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A. Are cycles per unit time

B. Are the same as those of the rate constant

C. Depend on temperature, pressure etc. of the reaction

D. Depend on the order of the reaction

3199. A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A ? B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
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A. Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1

B. Inner catalyst core of radius R/8 does not participate in reaction

C. Inner catalyst core of radius 7R/8 does not participate in reaction

D. Inner catalyst core of radius R/2 does not participate in reaction

3200. Thermodynamic equilibrium constant in a system is affected by___________________?
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A. All A., B. & C.

B. Inerts

C. Temperature

D. Pressure

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