1. Why are electrodes placed in resistance-heated fluidized bed?
a) Achieve high temperatures
b) Acts as heat transfer surface
c) Helps in magnetizing the metallic particle
d) None of the mentioned
Explanation: To maintain very high temperatures through passing high density current through electrically conductive material.
2. Operating conditions and feed ratios are different for all these processes, however, conversion of limiting reagent, acetic acid is roughly 50-70%, true or false?
a) true
b) false
Explanation: Based on experiments conducted by Du pont company
3. In the dilute phase reacting system, reacting gases carry suspended catalyst through tubes of a vertical heat exchanger with velocity of?
a) 3 to 12 m/s
b) 12 to 24 m/s
c) 1 to 3 m/s
d) 0.1 to 10 m/s
Explanation: This range of velocity provides relevant driving force for smooth circulation of powdered catalyst.
4. What is the mesh range that the catalytic reactor for vinyl acetate developed by Du pont uses?
a) 30 to 150 mesh
b) 150 to 200 mesh
c) 10 to 50 mesh
d) 200 to 300 mesh
Explanation: Optimum range to prevent elutrition and avoiding bubble cap blockage.
5. Kellogg company developed a synthetic gasoline plant based on dilute phase transfer line, works on the principle of circulation system for the solids, true or false?
a) true
b) false
Explanation: They developed such fluidized bed which works on principle of circulation system for solids.
6. In Sohio process, after fluidized bed, instead of several separation units, why cant we use a single distillation column?
a) Difficult to separate
b) Economics
c) Space factor
d) None of the mentioned
Explanation: Since the boiling points of the end products are very close, distillation columns cannot be used to separate them.
7. What is the role of cone shaped structure in the Du pont catalytic reactor?
a) Gas distribution
b) To occupy empty space
c) To prevent attrition
d) For better fluidization
Explanation: Cone helps in gas distribution for better gas-solid contact and eliminate gas bypassing.
8. First commercial fluidized bed for gasification of powdered coal which was awarded patent in 1922, was developed by?
a) Fritz Winker
b) Colburn Jake
c) Dolph Jagger
d) Cameron John
Explanation: Fritz winker developed it.
9. Based on the current technology, do you consider Winkler gas producer efficient and is still better to use?
a) Yes, it can still be used
b) Depending on the process we should decide its efficiency
c) No, because of its high consumption of oxygen
d) No, because it is big in size.
Explanation: Due to its inefficient design, it leads to high oxygen consumption and large carbon loss by entrainment.
10. Which is the best suitable equipment to be introduced in the thermofor catalytic cracking?
a) Bucket elevator
b) Gas lift
c) Bucket and Lift elevator
d) Pneumatic conveying system
Explanation: It provides smooth circulation of the reactants.