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.
Related Mcqs:
- Batch process is preferred over continuous process, when the___________________?
A. Product yields and quality cannot be achieved in continuous process, because of long
residence time
B. Sales demand of product is not steady
C. Same equipment cannot be used for several processes of the same nature
D. All A., B. & C. - Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about _______________ minutes?
A. 3
B. 4
C. 6
D. 10 - A batch reactor is characterised by ____________________?
A. Constant residence time
B. Variation in extent of reaction and properties of the reaction mixture with time
C. Variation in reactor volume
D. Very low conversion - The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is __________________?
A. 0
B. 1
C. 1.5
D. 2 - For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction?
A. XA = k . t
B. [CA0/(1 + εA XA)] (dXA/dt) = k
C. -ln(1 – XA) = kt
D. εA . ln (1 – XA) = k . t - Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ?
A. Time
B. Useful volume of the tank
C. Diameter of the reactor
D. None of these - A batch reactor is suitable for__________________?
A. Achieving cent percent conversion of reactants into products
B. Large scale gaseous phase reactions
C. Liquid phase reactions
D. Obtaining uniform polymerisation products in highly exothermic reactions - Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?
A. 1/4
B. 1/2
C. 2
D. 4 - In a semi-batch reactor __________________?
A. Mixing takes place in axial direction only
B. Velocity of reaction can be controlled
C. Condition similar to plug flow reactor exists
D. Residence time is constant - A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be ____________?
A. 5°C
B. 10°C
C. 20°C
D. 100°C
