Chemical Reaction Engineering problems
- 1. 'If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
Options- A. pressure
- B. temperature
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: temperature
- 2. In an exothermic chemical reaction, the reactants compared to the products have
Options- A. higher temperature
- B. more energy
- C. less energy
- D. same energy. Discuss
Correct Answer: more energy
- 3. Which of the following is the most suitable for very high pressure gas phase reaction?
Options- A. Batch reactor
- B. Tubular flow reactor
- C. Stirred tank reactor
- D. Fluidised bed reactor Discuss
Correct Answer: Tubular flow reactor
- 4. For a reaction of the type,
, the rate of reaction (- rx) is given by
Options- A. (K1+K1)CX
- B. (K1+K2+K3)CX
- C. K1CV - K2CX
- D. (K1-K2)CX Discuss
Correct Answer: K1CV - K2CX
- 5. For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
Options- A. fixed
- B. fluidised bed reactor followed by a fixed
- C. fixed bed reactor followed by a fluidised
- D. fluidised Discuss
Correct Answer: fluidised bed reactor followed by a fixed
- 6. Specific rate constant for a second order reaction
Options- A. is independent of temperature.
- B. varies with temperature.
- C. depends on the nature of the reactants.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
- 7. Pick out the wrong statement pertaining to space velocity of flow reactors.
Options- A. The unit of space velocity is (time)-1 .
- B. The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour.
- C. The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor.
- D. none of these. Discuss
Correct Answer: The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor.
- 8. BET apparatus
Options- A. measures the catalyst surface area directly.
- B. operates at very high pressure.
- C. is made entirely of stainless steel.
- D. none of these. Discuss
Correct Answer: none of these.
- 9. The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is
Options- A. backmix reactor
- B. plug flow reactor
- C. series of CSTR
- D. PFR in series Discuss
Correct Answer: backmix reactor
- 10. Pick out the wrong statement.
Options- A. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.
- B. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.
- C. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
- D. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction. Discuss
Correct Answer: Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
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