chemical engineering MCQs – Page 154

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 Review each marked answer and report any item that may be outdated or unclear.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

3061. If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________?
0

A. 4

B. 3

C. 2

D. 1

3062. In flow reactors, the performance equations interrelate the rate of reaction to the___________________?
0

A. Reactor volume

B. Extent of reaction

C. Feed rate

D. All A., B. and C.

3063. When an exothermic reversible reaction is conducted adiabatically, the rate of reaction____________________?
0

A. Continuously decreases

B. Continuously increases

C. Passes through a maximum

D. Passes through a minimum

3064. The best method of determining sulphur in crude oil is by the _______________ method?
0

A. Junkers calorimeter

B. Kjeldahl

C. Dumas

D. Bomb calorimeter

3065. CnH2n is the general formula for_______________?
0

A. Olefins

B. Naphthenes

C. Both A. and B.

D. Neither A. nor B.

3066. If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process. The diffusivity under this condition is called Knudsen diffusivity, which is affected by the_____________________?
0

A. Pressure

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

3067. An isothermal aqueous phase reversible reaction, P ? R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is_________________?
0

A. 1.33

B. 1.60

C. 0.8

D. 2.67

3068. Carbon particles accumulated on the catalyst used in the gas oil cracking lies in the category of _____________________ poison?
0

A. Stability

B. Selectivity

C. Deposited

D. Chemisorbed

3069. Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an ______________ reaction?
0

A. Elementary

B. None of these

C. Parallel

D. Consecutive

3070. A backmix reactor_________________?
0

A. Employs mixing in axial direction only

B. Is same as plug-flow reactor

C. Is same as ideal stirred tank reactor

D. Is most suitable for gas phase reaction

3071. Backmixing is most predominant in___________________?
0

A. CSTRs connected in series

B. A plug-flow reactor

C. A well stirred batch reactor

D. A single CSTR

3072. The catalytic activity of enzymes is due to their capacity to lower the ______________ energy?
0

A. Potential

B. Activation

C. None of these

D. Kinetic

3073. Which of the following is desirable in diesel and kerosene but is undesirable in gasoline ?
0

A. Mercaptans

B. Aromatics

C. Naphthenic acid

D. Paraffins

3074. What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on ?
0

A. Litre/mole

B. Litre/mole.second

C. Moles/litre.second

D. Litre/second

3075. If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to___________________?
0

A. (E + ED)/2

B. The intrinsic activation energy E

C. (E + ED) where ED is activation due to diffusion

D. ED/2

3076. Which of the following is a controlling factor in very fast heterogeneous reaction ?
0

A. Temperature

B. Heat and mass transfer effects

C. Pressure

D. Composition of reactant

3077. The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is________________?
0

A. 0

B. 1

C. > 1

D. ?

3078. In the reversible reaction of the type, A + B ? AB, in general__________________?
0

A. Both forward and backward reactions will be exothermic

B. Neither of the reactions will be endothermic

C. The combination reaction will be exothermic, while the dissociation reaction will be

D. othermic</strong>

E. The combination reaction will be endothermic, while the dissociation reaction will be

F. thermic

3079. The importance of diffusion in a catalyst are increased by ____________________?
0

A. All A., B. and C.

B. An active surface of the catalyst

C. Large catalyst particle size

D. Small pore diameter

3080. In a reversible reaction, a catalyst increases the rate of forward reaction__________________?
0

A. And the backward reaction equally

B. Only

C. To a greater extent than that of the backward reaction

D. And decreases that of the backward reaction

Previous Next

Showing 3061 to 3080 of 8709 mcqs