Chemical Reaction Engineering MCQs

Question 1

For the reaction, A + B → 2B + C,

Accepted Answer

rA = -rB

Answer

rA = rB

Answer

rA = 2rB

Answer

rA = rB/2

Question 2

An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will

Accepted Answer

Be more in PFR than in CSTR

Answer

Be more in CSTR than in PFR

Answer

Be same in both cases

Answer

Depend on the temperature

Question 3

Organic catalysts differ from the inorganic catalyst in the sense that the former is

Accepted Answer

Proteinous in nature

Answer

Active at cryogenic temperatures only

Answer

Prohibitively costly

Answer

Active at very high temperature only

Question 4

For an ideal plug flow reactor, the value of Peclet number is

Accepted Answer

∞

Answer

0

Answer

1

Answer

10

Question 5

If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

Accepted Answer

3

Answer

1

Answer

2

Answer

0

Question 6

If 'n' is the order of reaction, then unit of rate constant is

Accepted Answer

1/(time)(concentration)n - 1

Answer

(time)-1 (concentration)n - 1

Answer

(time)n - 1 (concentration)

Answer

None of these

Question 7

A stirred tank reactor compared to tubular-flow reactor provides

Accepted Answer

All of the above

Answer

More uniform operating conditions

Answer

Permits operation at the optimum temperature for a long reaction time

Answer

Higher overall selectivity for a first order consecutive reaction

Question 8

The energy balance equation over a tubular reactor under transient conditions is

Accepted Answer

A non-linear partial differential equation

Answer

An ordinary non-linear differential equation

Answer

An algebric differential equation

Answer

A linear partial differential equation

Question 9

Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Accepted Answer

There is no dynamic equilibrium between successive layer

Answer

Langmuir's assumption applies to every adsorbed layer

Answer

The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

Answer

None of these