Chemical Reaction Engineering MCQs

Question 1

Ionic reactions occur in

Accepted Answer

Solutions

Answer

Solid state only

Answer

Liquid state only

Answer

Any state

Question 2

Autocatalytic reactions are best carried out in a

Accepted Answer

Recycle reactor

Answer

CSTR

Answer

CSTR in series

Answer

Plug flow reactor

Question 3

Half life period of a first order irreversible reaction A → B is

Accepted Answer

$$\ln \frac{2}{{	ext{k}}}$$

Answer

$$\frac{{	ext{k}}}{2}$$

Answer

$$\ln \frac{{	ext{k}}}{2}$$

Answer

$$\ln \frac{{{	ext{0}}{	ext{.5}}}}{{	ext{k}}}$$

Question 4

Which of the following is an autocatalytic reaction?

Accepted Answer

Microbial fermentation reaction

Answer

Photochemical reactions

Answer

Enzyme fermentation reaction

Answer

Ammonia synthesis reaction

Question 5

Which of the following is not endothermic in nature?

Accepted Answer

Combustion of sulphur

Answer

Gasification of carbon

Answer

Thermal cracking of fuel oil

Answer

Steam reforming of naphtha

Question 6

For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.

Accepted Answer

Chemical reaction

Answer

Film diffusion

Answer

Diffusion through ash layer

Answer

Either A, B or C

Question 7

For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Accepted Answer

Diffusion through ash layer

Answer

Film diffusion

Answer

Chemical reaction

Answer

Either A, B or C

Question 8

The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to

Accepted Answer

$$\frac{1}{{	ext{m}}}$$

Answer

m

Answer

$$\sqrt {	ext{m}} $$

Answer

m2

Question 9

Reactions with high activation energy are

Accepted Answer

Very temperature sensitive

Answer

Temperature insensitive

Answer

Always irreversible

Answer

Always reversible