Chemical Engineering Archives

7851. Space velocity

Describes the extensive operating characteristics of a tubular flow reactor

Is the maximum feed rate pre unit volume of reactor for a given conversion

Is a measure of the ease of the reaction

All of the above

✅ The correct answer is option D.

7852. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?

Time

Useful volume of the tank

Diameter of the reactor

None of these

✅ The correct answer is option A.

7853. 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.

Film diffusion

Diffusion through ash layer

Chemical reaction

Either A, B or C

✅ The correct answer is option C.

7854. The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt

At the inlet

At the outlet

In the reactor

Averaged over the inlet and outlet

✅ The correct answer is option B.

7855. With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be

Higher in P.F. reactor

Higher in CSTR

Same in both the reactors

Data insufficient; can’t be predicted

✅ The correct answer is option A.

7856. A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

Decreases

Increases

Is at the highest allowable temperature throughout

First increases and then decreases

✅ The correct answer is option C.

7857. The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant ‘A’ is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.

0.5

✅ The correct answer is option A.

7858. Oil is hydrogenated using nickel catalyst in a __________ reactor.

Batch

Slurry

Fluidised bed

Fixed bed

✅ The correct answer is option B.

7859. Which of the following is the most suitable for very high pressure gas phase reaction?

Batch reactor

Tubular flow reactor

Stirred tank reactor

Fluidised bed reactor

✅ The correct answer is option B.

7860. Catalyst carriers

Have very high selectivity

Increase the activity of a catalyst

Provide large surface area with a small amount of active material

Inhibit catalyst poisoning

✅ The correct answer is option C.