1. How are the no. of holes decided on the distributor, in the fluid catalytic cracking unit?
a) Pressure drop
b) Height of bed
c) Superficial velocity of gas
d) None of the mentioned
Explanation: Pressure drop should be about 35 to 70 cm water, depending on that no. of holes are decided.
2. How can we prevent the flat distributor to buckle off under normal stresses, in FCC?
a) Concave plates
b) Convex plates
c) Both concave and convex plates
d) None of the mentioned
Explanation: Using both plates will withstand more stresses than individual.
3. What are problems encountered in the fluid catalytic cracking unit?
a) Violent bubbling action
b) Gas by-passing
c) More load on gas cleaning equipments
d) All of the mentioned
Explanation: FCC units facing all these problems because of poor flow pattern which leads to above consequences.
4. How can we study and control the size distribution factors which are responsible for improved circulations in FCC?
a) Attrition kinetics and cyclone effectiveness
b) Flow patterns of bubbles
c) Kinetics of catalyst in the regenerator
d) None of the mentioned
Explanation: Knowledge on attrition kinetics and cyclone effectiveness helps to manipulate these factors to proper advantage.
5. How did Shell oil company managed to reduce serious gas bypassing in FCC unit?
a) Using plug flow and fluidized bed
b) Reactor and Regenerator
c) Plug flow reactor and tubular reactor
d) Batch reactor and fluidized bed
Explanation: First stage with plug flow and second stage with fluidized bed have help to reduce gas bypassing
6. What do you mean by catalytic reforming?
a) Combining of higher hydrocarbon
b) Break down of higher hydrocarbon
c) Chemical reaction
d) Increases rate of reaction
Explanation: In reforming operation a light hydrocarbon feed isomerizes to produce higher hydrocarbon.
7. In SOD hydro-former, what are the temperatures in reactor and regenerator?
a) 483 and 594 degrees
b) 594 and 483 degrees
c) 400 and 500 degrees
d) 500 and 400 degrees
Explanation: Since cracking of naphtha requires high temperature and much higher temperature for catalyst regeneration.
8. What is the typical octane number of feed naphtha in the SOD hydro-former?
a) 30 to 50
b) 5 to 10
c) 50 to 70
d) None of the mentioned
Explanation: Based on the experimental data, the feed octane has been decided.
9. What is the yield percentage of the naphtha feed in SOD hydro-former?
a) 70 to 90%
b) 5 to 10%
c) 20 to 40%
d) 50 to 60%
Explanation: Based on the experimental data, the percentage of yield has been found.
10. What is the octane number of gasoline after the process in SOD hydro-former?
a) 75 to 100
b) 20 to 40
c) 50 to 70
d) None of the mentioned
Explanation: Based on the experimental data, range of octane number has been found.