A. There is no mixing in longitudinal direction
B. Mixing takes place in radial direction
C. There is a uniform velocity across the radius
D. All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
Last Updated: February 24, 2019
Related MCQs
- In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation?
- When a catalyst increases the rate of forward reaction, the value of rate constant__________?
- For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor?
- For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times?
- The effect of increasing pressure on the gaseous equilibrium of the reaction 2X + 3Y ⇌ 3X + 2Y indicates that__________?
- Signal normally used to study non-ideal flow by stimulus response technique is __________ input?
- A high space velocity means that a given__________?
- At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of „E/R‟ ?
- Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as__________?
- Which of the following is not a chemical step in a fluid solid catalytic reaction ?
- In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will__________?
- Catalyst carriers__________?
- Rate determining step in a reaction consisting of a number of steps in series is the __________ step?
- __________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction ?
- If in the gaseous phase reaction, N2O4 ⇌ 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be__________?
- The catalyst in a second order reversible reaction increases the rate of the forward reaction__________?
- The rate constant of a first order reaction depends on the __________?
- The units of frequency factor in Arrhenius equation__________?
- Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?
- A catalyst in a chemical reaction __________ free energy change in the reaction?
- 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__________?
- The catalytic activity of enzymes is due to their capacity to lower the __________ energy?
- In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds?
- Conversion increases with increase in temperature in case of a/an __________ reaction?
- Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3 ⇌ CaO + CO2), the pressure of CO2 increases, if__________?
- Thermodynamic equilibrium constant in a system is affected by__________?
- Sum of the powers of the concentration terms in the rate equation is called the __________ of the reaction?
- The rate at which a chemical substance reacts is proportional to its __________?
- Which of the following is the most suitable for isothermal operation?
- An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature?
- The rate of forward reaction, at chemical equilibrium is __________ the rate of backward reaction?
- For a first order chemical reaction, the rate constant__________?
- When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value?
- Reverse reaction in a chemical equilibrium is favoured by the__________?
- With increase in temperature, the equilibrium __________ rises in case of endothermic reaction?
- 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 ?
- Which of the following is an autocatalytic reaction ?
- 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?
- During manufacture of H2SO4, the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the __________?
- From Arrhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is__________?
- Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CA a-b ?
- Design of heterogamous catalytic reactor involves consideration of __________ steps?
- Holding time for flow reactors is __________ the space time, for constant fluid density ?
- The reactions of high molecularity are rare, because__________?
- The role of a catalyst in a chemical reaction is to change the__________?
- Slurry reactors are characterised by the__________?
- consecutive reaction, as shown in the bellow figure, is characterised by __________?
- A multiple reaction may be classified as a __________ reaction?
- Molecularity of a reaction__________?
- A balanced chemical reaction equation conforms to the law of__________?
- 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 __________?