Chemical Engineering - Chemical Reaction Engineering

36. 

The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from

A. l.0 to 10-8
B. l.l.to 102
C. 0.1 to 0.9
D. none of these

Answer: Option A

Explanation:

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37. 

For a zero order reaction, the concentration of product increases with the

A. increase of reaction time.
B. increase in initial concentration.
C. total pressure.
D. decrease in total pressure.

Answer: Option A

Explanation:

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38. 

Pick out the wrong statement.

A. 'Hold back' is defined as the fraction of material that stays longer than the mean residence time.
B. Study of non-ideal flow reactor is done experimentally by stimulus-response technique.
C. For studying a chemical reaction, it is desirable to monitor the reactants during initial stages and the products during the final stages of reaction.
D. A batch reactor can not be used to study the kinetics of catalytic reaction.

Answer: Option D

Explanation:

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39. 

Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.

A. pore diffusion
B. gas film
C. chemical reaction
D. none of these

Answer: Option A

Explanation:

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40. 

The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)

A. E
B. E + ΔHA
C. E + ΔHA - ΔHR)
D. ΔHA + ΔHR

Answer: Option C

Explanation:

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