A. Quality & yield cannot be achieved in continuous processes, because of long residence time
B. Sales demand is fluctuating
C. Both A. & B.
D. Neither A. nor B.
Correct Answer: C. Both A. & B. ✔
Last Updated: February 24, 2019
Related MCQs
- A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?
- A batch reactor is__________?
- Radioactive decay follows __________ order kinetics?
- The single parameter model proposed for describing non-ideal flow is the __________ model?
- Photochemical reaction rate does not depend significantly on temperature, because__________?
- A batch reactor is suitable for__________?
- A backmix reactor__________?
- For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption?
- In the reversible reaction of the type, A + B ⇌ AB, in general__________?
- In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg mole?
- Which of the following is a controlling factor in very fast heterogeneous reaction ?
- For a zero order chemical reaction, the__________?
- An imbalanced chemical reaction equation is against the law of__________?
- __________ is the response curve for a step input signal from a reactor ?
- ‘N’ plug flow reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for __________ order reactions?
- Enzymes are destroyed, when the__________?
- Ionic reactions occur in__________?
- With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction__________?
- In a chemical reaction, __________ are conserved?
- Sulphuric acid is used as a catalyst in the__________?
- An autothermal reactor is__________?
- Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?
- For a vapour phase catalytic reaction (A + B → P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?
- At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g), CO(g) + H2O(g) ⇌ CO2(g) + H2(g) CH4(g) + 2H2O(g) ⇌ CO2(g) + 4H2(g) Then K1, K2 and K3 are related as ?
- For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a__________?
- A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
- The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises from 10 to 100°C?
- For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR ?
- When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is__________?
- A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction?
- Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ?
- When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield?
- In flow reactors, the performance equations interrelate the rate of reaction to the__________?
- In an ideal tubular-flow reactor__________?
- 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 __________?