Fluidised bed reactor is characterized by____________________?

Related Mcqs:

1. The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ?

   A. CA = 1.2 CA0 (1 – X)/(1 – 0.33X)
   B. CA = 1.2 CA0 (1 – X)/(1 – 0.5X)
   C. CA = 0.83 CA0 (1 – X)/(1 – 0.33X)
   D. CA = 0.83 CA0 (1 – X)/(1 – 0.5X)

2. The gas phase reaction 2A ⇌ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?

   A. 2/3
   B. 5/8
   C. 1/3
   D. 3/8

3. In case of a _____________ reactor, the composition in the reactor and at the exit of the reactor is the same ?

   A. Semi-batch
   B. Tubular
   C. Batch
   D. Back-mix

4. Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH → C2H4 + H2O 2C2H5OH → C2H5 – O – C2H5 + H2O The percent conversion of ethanol in the reactor is________________?

   A. 100
   B. 97.5
   C. 95
   D. 2.5

5. For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?

   A. Ideal plug flow
   B. Bypass
   C. Dead zone
   D. Channelling

6. A trickle bed reactor is the one, which_________________?

   A. Has altogether three streams either entering or leaving
   B. Processes three reactants at different flow rates
   C. Processes three reactants with same flow rate
   D. Employs all the three phases (i.e. solid, liquid and gas)

7. For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?

   A. Fixed
   B. Fluidised bed reactor followed by a fixed
   C. Fixed bed reactor followed by a fluidised
   D. Fluidised

8. A plug-flow reactor is characterized by _____________________?

   A. High capacity
   B. Presence of axial mixing
   C. Presence of lateral mixing
   D. Constant composition and temperature of reaction mixture

9. A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is_______________________?

   A. d(VCA)/dt = -F (CAF – CA) – kCA2V
   B. d(VCA)/dt = F (CAF – CA) – kCA2V
   C. d(VCA)/dt = -FCA – kCA2V
   D. d(VCA)/dt = FCAF – kCA2V

10. 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. Decreases
    B. Increases
    C. Is at the highest allowable temperature throughout
    D. First increases and then decreases