Which of the following is the most suitable for isothermal operation?

Related Mcqs:

1. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a _________________ reactor?

   A. Stirred tank
   B. Tubular flow
   C. Batch
   D. Fixed bed

2. 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 ?

   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

3. 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

4. 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

5. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?

   A. Catalyst size is reduced or the catalyst diffusivity is reduced
   B. Catalyst size is reduced or the catalyst diffusivity is increased
   C. Catalyst size is increased or the catalyst diffusivity is reduced
   D. Catalyst size is increased or the catalyst diffusivity is increased

6. A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?

   A. Diffusion within the pellet
   B. Reaction
   C. External mass transfer
   D. None of the above

7. 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

8. An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP – 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is_________________?

   A. 0.80
   B. 1.33
   C. 1.60
   D. 2.67

9. For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is____________________?

   A. 2
   B. 4
   C. 11
   D. 22

10. The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is___________________?

    A. 0.5
    B. 1
    C. 2
    D. 3