Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s -Apparatus and Material of Construction
1 - Question
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 - Question
The time of contact with the catalyst in autoclaves depend on?
a) Temperature
b) Reactants
c) Rate of pumping
d) All of the mentioned
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Explanation: In autoclaves, the time of contact with the catalyst being dependent on the rate of pumping.
3 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
Autoclave does not consists of a reflux condenser.
a) True
b) False
View Answer
Explanation: Autoclave consists of a reflux condenser.