chemical engineering MCQs – Page 148

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 Review each marked answer and report any item that may be outdated or unclear.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

2941. Reaction rate of a first order reaction, which is half completed in 23 minutes will be _________________?
0

A. 0.03 sec-1

B. 0.03 hr-1

C. 0.03 min-1

D. 0.05 min-1

2942. The rate of the reaction, X ? Y, quadruples when the concentration of X is doubled. The rate expression for the reaction is, r = K Cx n, the value of n in this case will be_______________________?
0

A. 3

B. 2

C. 0

D. 1

2943. Three plug flow reactors (PFRs) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ?
0

A. 100

B. 150

C. 200

D. 225

2944. Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order?
0

A. Zero

B. First

C. Second

D. Third

2945. If ?G (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________?
0

A. Unpredictable as ?G is no measure of feasibility of a reaction

B. Very much feasible

C. Not feasible

D. Just feasible

2946. 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?
0

A. 95%

B. 20%

C. 75%

D. 100%

2947. The rate expression for a heterogeneous catalytic reaction is given by, rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ?HR and ?HA are the activation energies of adsorption of R and A) ?
0

A. E

B. E + ?HA

C. ?HA + ?HR

D. E + ?HA ?HR)

2948. Which of the following is not endothermic in nature ?
0

A. Gasification of carbon

B. Combustion of sulphur

C. Thermal cracking of fuel oil

D. Steam reforming of naphtha

2949. Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?
0

A. Independent of

B. Proportional to the square of

C. Inversely proportional to

D. Proportional to

2950. Integral method for analysing the kinetic data is used _____________________?
0

A. When the data are scattered

B. For testing specific mechanisms with simple rate expressions

C. Both A. and B.

D. None of these

2951. Shift conversion reaction_________________?
0

A. Converts CO to CO2 with steam

B. Converts N2 and H2 into NH3

C. Is non-catalytic

D. Is highly exothermic

2952. What is the value of n if the reaction rate of the chemical reaction A ? B, is proportional to CA n and it is found that the reaction rate triples, when the concentration of A is increased 9 times ?
0

A. 1/2

B. 9-Jan

C. 3

D. 3-Jan

2953. Which of the following holds good for an elementary reaction as shown in the bellow figure ?
0

A. The rate of disappearance of Y is equal to the rate of appearance of Z

B. Three times the rate of disappearance of X is equal to the rate of appearance of Z

C. The rate of disappearance of Y is equal to the rate of disappearance of X

D. The rate of disappearance of X is equal to the rate of appearance of Z

2954. In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of P is doubled on doubling the concentration of X (ii) Rate of formation of P is quadrupled on doubling the concentration of Y (iii) Doubling the concentration of Z does not affect the rate of formation of P What is the order of the above chemical reaction ?
0

A. Zeroth order

B. First order

C. Second order

D. Third order

2955. Promoter_____________________?
0

A. Initiates a chemical reaction and is a catalyst by itself

B. ating discontinuities in the crystals</strong>

C. Increases the number of active centres by increasing the unevenness of catalyst surface and by

D. All A., B. and C.

E. Alters the position of equilibrium in a reversible reaction

2956. Molecularity of an elementary reaction, P + Q ? R + S is ____________________?
0

A. 1

B. 2

C. 3

D. 4

2957. Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?
0

A. Strong pore diffusion control and mass transfer not controlling

B. Both pore diffusion and mass transfer not controlling

C. Both pore diffusion and mass transfer controlling

D. Mass transfer controlling

2958. Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction?
0

A. Zero order

B. Consecutive

C. None of these

D. Third order

2959. A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of_______________?
0

A. 3

B. 3-Jul

C. 6

D. 7

2960. Which of the following is used for calcination of limestone and dolomite in industrial practice?
0

A. None of these

B. Fixed bed reactor

C. Fluidised bed reactor

D. Moving bed reactor

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