A. 0
B. 1
C. ∞
D. √2π
Related Mcqs:
- The exit age distribution of fluid leaving a vessel is used to know the__________________?
A. Activation energies of a reaction
B. Reaction mechanism
C. Extent of non-ideal flow in the vessel
D. None of these - 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 - The exit age distribution curve E(t) for an ideal CSTR with the average residence time, η, is given by__________________?
A. e-t/η
B. e-t/η/η
C. 1 – e-t/η
D. 1 – (e-t/η/η) - The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?
A. 400
B. 500
C. 600
D. 1000 - The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _____________________?
A. At the inlet
B. At the outlet
C. In the reactor
D. Averaged over the inlet and outlet - Signal normally used to study non-ideal flow by stimulus response technique is _______________ input?
A. Pulse
B. Step
C. Both A. & B.
D. Neither A. nor B. - A pulse tracer is introduced in an ideal CSTR (with a mean residence time I) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be__________________?
A. 2η
B. 0.5η
C. η/0.693
D. 0.693η - 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 - In a/an _____________ vessel, the fluid enters and leaves following plug flow?
A. Open
B. Closed
C. Open-closed
D. Close-opened - 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
