The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________?

Related Mcqs:

1. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always ?

   A. 1
   B. < 1
   C. > 1
   D. Equal to the order of reaction

2. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?

   A. Di, opt = 3.9 Q0.45 ρ0.13
   B. Di, opt = 3.9 Q0.45. μ0.95
   C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
   D. Di, opt = 3 Q0.36. μ0.88

3. In a continuous distillation column, the optimum reflux ratio ranges from _______________ times the minimum reflux ratio?

   A. 1.1 to 1.5
   B. 1.6 to 2
   C. 2.2 to 2.6
   D. 2.7 to 3

4. Optimum reflux ratio in a continuous distillation column is determined by the__________________?

   A. Maximum permissible vapour velocity
   B. Flooding limit of the column
   C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
   D. None of these

5. Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

   A. 0.01
   B. 0.3
   C. 0.75
   D. 0.95

6. Which of the following types of reactors is the safest from operation point of view ?

   A. A vapor phase reactor
   B. Pot type reactor
   C. A liquid phase reactor
   D. A liquid phase catalytic reactor

7. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?

   A. Di, opt = 3 Q0.36 ρ0.18
   B. Di, opt = 3.9 Q0.45 ρ0.23
   C. Di, opt = 7.6 Q0.36 ρ0.9
   D. Di, opt = 3 Q0.36 ρ1.86 μ0.08

8. Optimum economic pipe diameter for fluid flow is determined by the____________________?

   A. Viscosity of the fluid
   B. Density of the fluid
   C. Total cost considerations (pumping cost plus fixed cost of the pipe)
   D. None of these

9. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscosity above ____________________ poise?

   A. 300
   B. 600
   C. 1000
   D. 1500

10. Smoker’s equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?

    A. Relative volatility is close to one (e.g., separation of close boiling isomers)
    B. Feed is not at its bubble point
    C. Number of equilibrium stages in only stripping section is to be calculated
    D. Number of equilibrium stages required is likely to be very small