Chemical Reaction Engineering

Question: 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].

chanelling

Answer: Option C

Explanation:

No answer description available for this question.

Question: A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by
[A].

keff = k + kg

[B].

keff = (k+ kg)/2

[C].

keff = (kkg)1/2

[D].

Answer: Option D

Explanation:

No answer description available for this question.

Question: An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction
[A].

is maximum at the inlet of the reactor.

[B].

goes through a maximum along the length of the reactor.

[C].

goes through a minimum along the length of the reactor.

[D].

is maximum at the exit of the reactor.

Answer: Option A

Explanation:

No answer description available for this question.

Question: For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
[A].

is independent of pressure.

[B].

increases with pressure.

[C].

decreases with pressure.

[D].

increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes.
[A].

Strong pore diffusion control and mass transfer not controlling.

[B].

Both pore diffusion and mass transfer not controlling.

[C].

Both pore diffusion and mass transfer controlling.

[D].

Mass transfer controlling.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3 ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1 ; (ΔH) = – 40kJ/mole; ρ = 1000kg/m3CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
[A].

2/3 kW

[B].

1kW

[C].

5/3 kW

[D].

4kW

Answer: Option C

Explanation:

No answer description available for this question.

Question: Find a mechanism that is consistent with the rate equation and reaction given below:2A + B A2B, ( – rA) = k.CA.CB
[A].

A + B AB ; AB + A A2B

[B].

A + B AB;AB + A A2B

[C].

A + A AA;AA + B A2B

[D].

A + A AA;AA + B A2B

Answer: Option D

Explanation:

No answer description available for this question.

Question: An elementary liquid phase decomposition reaction is to be carried out in a CSTR. The design equation is
[A].

kτ = XA/(1 – XA)

[B].

kτ = XA(1 + XA)/(1 + XA)

[C].

kτ = XA/(1 – XA)2

[D].

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a series of reactions having k1 << k2, the reaction system can be approximated as
[A].

[B].

[C].

[D].

Answer: Option D

Explanation:

No answer description available for this question.

Question: A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
[A].

5°C

[B].

10°C

[C].

20°C

[D].

100°C

Answer: Option B

Explanation:

No answer description available for this question.