This set of Unit Processes Multiple Choice Questions & Answers (MCQs) focuses on “Apparatus and material of construction”.
1. What happens when the apparatus is smaller?
a) Fewer side reactions
b) Equilibrium defined
c) More velocity
d) All of the mentioned
View Answer
Explanation: In hydrogenation we get higher pressures, where the apparatus is smaller, under such conditions, the reaction velocity is increased; the equilibrium positions are made more favourable; the reaction path is better defined, with fewer side reactions; and heating and cooling and heat interchange are facilitated.
2. The time of contact with the catalyst in autoclaves depend on?
a) Temperature
b) Reactants
c) Rate of pumping
d) All of the mentioned
View Answer
Explanation: In autoclaves, the time of contact with the catalyst being dependent on the rate of pumping.
3. With the use of which pump water can be pumped into the hydrogen-control tank?
a) One unit proportionating pump
b) Two-unit proportioning pump
c) Three-unit proportioning pump
d) None of the mentioned
View Answer
Explanation: With the use of a two-unit proportioning pump, water can be pumped into the hydrogen-control tank to bring it back to pressure and thus make up for the hydrogen consumed in the reaction.
4. Which type of reaction is hydrogenation?
a) Exothermic
b) Endothermic
c) Neutral
d) None of the mentioned
View Answer
Explanation: Hydrogenation reactions are usually exothermic, so that once the process is started, the problem may be one of heat removal.
5. Which of the following are vessels used as reactors for commercial operations?
a) Tape-wound
b) Forgings
c) Valves and closure
d) All of the mentioned
View Answer
Explanation: Different types of forgings and tape-wound vessels for use as reactors for commercial operations, along with heat exchangers, types of closures, valves, and instrumentation are described in the literature.
6. Valves are an important part of any high-pressure operation.
a) True
b) False
View Answer
Explanation: Valves are an important part of any high-pressure operation, and in coal hydrogenation they have to withstand hydrogen embrittlement, corrosion, creep at high temperatures, and erosion from solid-liquid mixtures at temperatures of 1000°F and pressures of 10,000 psig.
7. Which type of unit is high pressure autoclave?
a) Large
b) Small
c) Moderate
d) None of the mentioned
View Answer
Explanation: A high pressure autoclave is a small-scale continuous unit.
8. Autoclave does not consists of a reflux condenser.
a) True
b) False
View Answer
Explanation: Autoclave consists of a reflux condenser.
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