Chemical Reaction Engineering MCQs

Question 1

__________ catalytic reaction is involved in the thermal cracking of gas oil.

Accepted Answer

Homogeneous

Answer

Homogeneous non

Answer

Heterogeneous

Answer

Heterogeneous non

Question 2

A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds.

Accepted Answer

3

Answer

1

Answer

$$\frac{1}{3}$$

Answer

32

Question 3

In the reversible reaction of the type, A + B ⇋ AB, in general

Accepted Answer

The combination reaction will be exothermic, while the dissociation reaction will be endothermic

Answer

Both forward and backward reactions will be exothermic

Answer

Neither of the reactions will be en-dothermic

Answer

The combination reaction will be endothermic, while the dissociation reaction will be exothermic

Question 4

Which of the following is not a dimension-less group used in catalysis? (where, D = dispersion co-efficient, cm2/sec. D1 = diffusion co-efficient, cm2/sec. L = length of the reactor, cm. t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.)

Accepted Answer

None of these

Answer

Reactor dispersion number $$\left( {\frac{{	ext{D}}}{{{	ext{vL}}}}} ight)$$

Answer

Reduced time $$\left( {\frac{{{	ext{vt}}}}{{	ext{V}}}} ight)$$

Answer

Thiele modulus $$\left( {{	ext{L}}\sqrt {\frac{{	ext{k}}}{{{{	ext{D}}_1}}}} } ight)$$

Question 5

Holding time for flow reactors is __________ the space time, for constant fluid density

Accepted Answer

Equal to

Answer

Double

Answer

Triple

Answer

None of these

Question 6

Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and 4H2 + CO2 = CH4 + 2H2O, KP = 101.17 the KP for the reaction CO + H2O = CO2 + H2 is

Accepted Answer

100.67

Answer

103.01

Answer

10-0.67

Answer

10-3.01

Question 7

Rate of a chemical reaction is not affected by the

Accepted Answer

Number of molecules of reactants taking part in the reaction

Answer

Catalyst

Answer

Temperature

Answer

Reactant's concentration

Question 8

Semibatch reactor is preferred, when a/an

Accepted Answer

All of the above

Answer

A highly exothermic reaction is to be controlled

Answer

Undersirable side reaction (at high concentration of one of the reactants) is to be avoided

Answer

A gas is to be reacted with liquid (e.g. hydrogenation of fat)

Question 9

6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant?

Accepted Answer

95%

Answer

100%

Answer

75%

Answer

20%