chemical engineering MCQs – Page 151

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 Review each marked answer and report any item that may be outdated or unclear.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
3001. Which one is used to determine the colour of petroleum products ?
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A. Saybolt chromometer

B. None of these

C. Colour comparator

D. Cleveland apparatus

3002. ____________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction ?
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A. Chemical reaction

B. Ash diffusion

C. Gas film diffusion

D. None of these

3003. The most important property for a jet fuel is its________________?
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A. Flash point

B. Viscosity

C. Freezing point

D. Calorific value

3004. Concentration of H2SO4 catalyst in alkylation is kept between 90-98%, because H2SO4 having concentration?
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A. Less than 90% promotes polymerisation

B. More than 98% promotes cracking

C. Both A. and B.

D. Neither A. nor B.

3005. For a mixed flow reactor operating at steady state, the rate of reaction is given by______________?
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A. #NAME?

B. (FA0/V) (dCA/dt)

C. (FA0/V) + (dCA/dt)

D. (FA0/V) XA
3006. Flash point of diesel/kerosene (>50C) is determined by the_______________?
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A. Abel apparatus

B. Pensky-Martens apparatus

C. None of these

D. Saybolt chromometer

3007. Which of the following has the minimum API gravity of all ?
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A. Kerosene

B. Diesel

C. Petrol

D. Furnace oil
3008. In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________?
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A. Fast reactions in catalyst of small pore diameter

B. Slow reactions in catalyst of small pore diameter

C. Slow reactions in catalyst of large pore diameter

D. Fast reaction in catalyst of large pore diameter

3009. An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction ?
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A. Goes through a minimum along the length of the reactor

B. Goes through a maximum along the length of the reactor

C. Is maximum at the exit of the reactor

D. Is maximum at the inlet of the reactor
3010. The eddy diffusivity for a liquid in plug flow must be_________________?
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A. 0

B. 1

C. ?

D. Between 0 and 1

3011. Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in ___________________?
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A. Gland

B. Blood

C. Saliva

D. Intestine

3012. Photochemical reaction rate does not depend significantly on temperature, because____________________?
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A. None of these

B. It is a reversible reaction

C. The energy of reacting molecules exceeds the activation energy by absorption of light

D. It is an exothermic reaction

3013. Natural gas recovered along with crude oil from oil wells is called wet natural gas which has a higher ______________ compared to the dry natural gas?
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A. Quantity of propane

B. Unsaturated hydrocarbon content

C. Quantity of butane

D. Calorific value
3014. An exothermic reaction takes place in an adiabatic reactor. The product temperature ______________ reactor feed temperature?
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A. Is always less than

B. May be greater or less than

C. Is always equal to

D. Is always greater than
3015. An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will ______________ with decrease in space time?
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A. Decrease

B. Increase exponentially

C. Remain unchanged

D. Increase

3016. A multiple reaction may be classified as a ________________ reaction?
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A. Mixed

B. Parallel or side

C. Consecutive or side

D. All A., B. and C.
3017. For a first order reaction carried out in a plug flow reactor, the space time is__________________?
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A. (1/k) ln C/C0

B. k ln C0/C

C. k ln C/C0

D. (1/k) ln C0/C
3018. A balanced chemical reaction equation conforms to the law of________________?
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A. None of these

B. Gaseous volumes

C. Avogadros hypothesis

D. Conservation of mass
3019. Crude topping column operates at ________________ pressure?
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A. Vacuum

B. 3 atm

C. 10 atm

D. Atmospheric
3020. In case of a _____________ reactor, the composition in the reactor and at the exit of the reactor is the same ?
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A. Back-mix

B. Batch

C. Tubular

D. Semi-batch