______________ is the response curve for a step input signal from a reactor ?

Related Mcqs:

1. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to ___________________?

   A. m
   B. 1/m
   C. √m
   D. m2

2. 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.

3. 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)

4. 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

5. 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

6. 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

7. An exothermic reaction takes place in an adiabatic reactor. The product temperature ______________ reactor feed temperature?

   A. Is always equal to
   B. Is always greater than
   C. Is always less than
   D. May be greater or less than

8. Rate determining step in a reaction consisting of a number of steps in series is the ______________ step?

   A. Fastest
   B. Slowest
   C. Intermediate
   D. Data insufficient; can’t be predicted

9. A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired ?

   A. CSTR followed by a PFR
   B. PFR followed by a CSTR
   C. CSTR followed by a PFR followed by a CSTR
   D. PFR followed by a CSTR followed by a PFR

10. 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