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1) 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_______________? a. 7 b. 6 c. 3 d. 7/3
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2) Equilibrium of a chemical reaction as viewed by kinetics is a ______________ state? a. Dynamic steady b. Static steady c. Dynamic unsteady d. None of these
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3) Kinetics of a catalytic reaction can be best studied on a/an ______________ reactor? a. Mixed b. Integral (plug flow) c. Differential (flow) d. Either A., B. and C.
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4) In a continuous flow stirred tank reactor, the composition of the exit stream_________________? a. Is same as that in the reactor b. Is different than that in the reactor c. Depends upon the flow rate of inlet stream d. None of these
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5) Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________________? a. (atm)-1 b. (hr)-1 c. (atm)-1.(hr)-1 d. atm.(hr)-1
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6) Half life period of a chemical reaction is_________________? a. The time required to reduce the concentration of the reacting substance to half its initial value b. Half of the space time of a reaction c. Half of the residence time of a reaction d. None of these
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7) Which of the following is the most suitable for very high pressure gas phase reaction ? a. Batch reactor b. Tubular flow reactor c. Stirred tank reactor d. Fluidised bed reactor
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8) Helium-mercury method can be used to determine the _____________ of the catalyst particle? a. Pore volume b. Solid density c. Porosity d. All A., B., & C.
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9) In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the____________________? a. Increase of temperature b. Decrease of temperature c. Increase in initial concentration of A d. Decrease in initial concentration of A
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10) The increase in the rate of reaction with temperature is due to__________________? a. Increase in the number of effective collisions b. Decrease in activation energy c. Increase in the average kinetic energy of the reacting molecules d. None of these
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11) A back mix reactor is___________________? a. Suitable for gas phase reactions b. Ideal at very low conversion c. Same as plug flow reactor (PFR) d. Same as ideal stirred tank reactor
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12) Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as______________________? a. k ∝ T1.5 b. k ∝ exp(-E/RT) c. k ∝ √T d. k ∝ T
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13) If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is _______________? a. Zero b. One c. Two d. Three
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14) The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to ___________________? a. m b. 1/m c. √m d. m2
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15) The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the _______________ energy? a. Activation b. Potential c. Binding d. Threshold
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16) The following half life data are available for the irreversible liquid phase reaction A → products. The overall order of reaction is __________________? a. 0.5 b. 1 c. 1.5 d. 2
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17) A catalyst is said to be a negative catalyst, if it ___________________? a. Retards the rate of reaction b. Reduces the value of equilibrium constant c. Does not initiate the reaction d. All A., B. and C.
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18) For multiple reactions, the flow pattern within the vessel affects the ____________________? a. Size requirement b. Distribution of reaction products c. Both A. and B. d. Neither A. nor B.
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19) The irreversible reaction is a special case of reversible reaction, if the________________? a. Equilibrium constant is 1 b. Conversion of the reactant at equilibrium condition is zero c. Reactant concentration at equilibrium condition is zero d. All A., B. and C.
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20) Rate of a chemical reaction is not influenced by the__________________? a. Catalyst b. Temperature c. Reactants concentration d. Number of molecules of reactants taking part in a reaction
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21) If Thiele modulus is ________________, then the pore diffusion resistance in a catalyst may be considered as negligible? a. 0 b. ∞ c. < 0.5 d. > 0.5
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22) ______________ explains the mechanism of catalysis? a. Activated complex theory b. Collision theory c. Thermodynamics d. None of these
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23) Which of the following factors control the design of a fluid-solid reactor ? a. Reaction kinetics for single particle b. Size distribution of solids being treated c. Flow patterns of solids and fluid in the reactor d. All A., B. and C.
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24) For an autocatalytic reactor, the suitable reactor set up is__________________? a. P.F. reactors in series b. CSTR in series c. CSTR followed by P.F. reactor d. P.F. reactor followed by CSTR
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25) A reactor is generally termed as an autoclave, when it is a_____________________? a. High pressure batch reactor b. Atmospheric pressure tank reactor c. High pressure tubular reactor d. Atmospheric pressure CSTR
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26) If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ? a. t ∝ 1/an b. t ∝ 1/an – 1 c. t ∝ 1/an + 1 d. t ∝ an
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27) A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1; (ΔH) = – 40kJ/mole; ρ = 1000kg/m3 CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is_________________? a. 2/3 kW b. 1 kW c. 5/3 kW d. 4 kW
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28) For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by___________________? a. (K1 + K1) CX b. (K1 + K2+K3) CX c. K1CV – K2CX d. (K1 – K2) CX
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29) A space time of 3 hours for a flow reactor means that___________________? a. The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours b. Three reactor volumes of feed can be processed every hour c. It takes three hours to dump the entire volume of the reactor with feed d. Conversion is cent per cent after three hours
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30) With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of ‘R’ in mixed reactor (for a given conversion of ‘A’) ? a. Decreases b. Increases c. Increases linearly d. Remain same
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