Chemical Reaction Engineering

Question: At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?
[A].

1.6

[B].

2

[C].

2.24

[D].

2.5

Answer: Option D

Explanation:

No answer description available for this question.

Question: For a tubular reactor with space time ‘τ’ and residence time ‘θ’, the following statement holds good.
[A].

τ and θ are always equal.

[B].

τ = θ , when the fluid density changes in the reactor.

[C].

τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant.

[D].

τ = θ , for a non-isothermal reactor.

Answer: Option C

Explanation:

No answer description available for this question.

Question: For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to
[A].

1

[B].

0.5

[C].

0.1

[D].

0

Answer: Option C

Explanation:

No answer description available for this question.

Question: Consider the ‘n’ th order irreversible liquid phase reaction A B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?
[A].

CA0 Vs t1/2

[B].

ln CA0 Vs t1/2

[C].

CA0 Vs ln t1/2

[D].

ln CA0 Vs ln t1/2

Answer: Option C

Explanation:

No answer description available for this question.

Question: From collison theory, the reaction rate constant is proportional to
[A].

[B].

[C].

T

[D].

Answer: Option D

Explanation:

No answer description available for this question.

Question: For a mixed flow reactor operating at steady state, the rate of reaction is given by
[A].

[B].

[C].

[D].

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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

Answer: Option D

Explanation:

No answer description available for this question.

Question: For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction.
[A].

XA = k . t

[B].

[C].

-ln(1 – XA) = kt

[D].

εA . ln (1 – XA) = k . t

Answer: Option B

Explanation:

No answer description available for this question.

Question: For reaction, P + 2 3R, molar rate of consumption of P is
[A].

double of that of Q.

[B].

same as that of Q.

[C].

half of that of Q.

[D].

2/3rd of that of Q.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Molecularity of an elementary reaction, P + Q R + S is
[A].

1

[B].

2

[C].

3

[D].

4

Answer: Option D

Explanation:

No answer description available for this question.