A. There is no mixing in longitudinal direction
B. Mixing takes place in radial direction
C. There is a uniform velocity across the radius
D. All A., B. and C.
Related Mcqs:
- An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will ______________ with decrease in space time?
A. Increase
B. Increase exponentially
C. Decrease
D. Remain unchanged - A backmix reactor_________________?
A. Is same as plug-flow reactor
B. Is same as ideal stirred tank reactor
C. Employs mixing in axial direction only
D. Is most suitable for gas phase reaction - A stirred tank reactor compared to tubular-flow reactor provides____________________?
A. More uniform operating conditions
B. Permits operation at the optimum temperature for a long reaction time
C. Higher overall selectivity for a first order consecutive reaction
D. All A., B. and C. - For a tubular flow reactor with uniform concentration and temperature, the independent variable is___________________?
A. Time
B. Length
C. Diameter
D. None of these - A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of_______________?
A. 7
B. 6
C. 3
D. 7/3 - For a tubular reactor with space time ‘η’ and residence time ‘ζ’, the following statement holds good ?
A. η and θ are always equal
B. η = θ, when the fluid density changes in the reactor
C. η = θ, for an isothermic tubular reactor in which the density of the process fluid is constant
D. η = θ, for a non-isothermal reactor - The energy balance equation over a tubular reactor under transient conditions is________________?
A. An ordinary non-linear differential equation
B. An algebraic differential equation
C. A linear partial differential equation
D. A non-linear partial differential equation - 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) - For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?
A. A Dirac delta function
B. A step function
C. A ramp function
D. None of the above - For an ideal plug flow reactor, the value of Peclet number is_______________?
A. 0
B. 1
C. 10
D. ∞
