Chemical Engineering Archives

Chemical Engineering

Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.

2801. Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of

thermal cracking

gum formation

coking

discoloration

✅ The correct answer is option C.

2802. In solutizer sweetening process, solutizer solution used is

methanol in Unisol process.

naphthenic acid in Mercapsol process.

both (a) and (b).

neither (a) nor (b).

✅ The correct answer is option C.

2803. Which of the following is the most important property for a jet fuel ?

Cloud point

Pour point

Colour

Freezing point

✅ The correct answer is option D.

2804. Carbon percentage (by weight) in crude petroleum may be about

✅ The correct answer is option C.

2805. The reservoir rock containing petroleum has

low porosity

high permeability

high porosity

both (b) and (c)

✅ The correct answer is option D.

2806. Asphalts are

low molecular weight & low boiling point compounds present in petroleum.

desirable in catalytic cracking feedstock, because they produce coke.

readily oxidisable and form carbonaceous sludge.

all (a), (b) & (c).

✅ The correct answer is option C.

2807. In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction

heavy distillates

intermediate distillates

light ends

residues

✅ The correct answer is option A.

2808. Liquefied Petroleum Gas (LPG) is mainly a mixture of

propane & butane

methane & ethane

high boiling olefins

high boiling naphthenes

✅ The correct answer is option A.

2809. Octane number of gasoline is a measure of its

resistance to knock.

ignition delay.

ignition temperature.

smoke point.

✅ The correct answer is option A.

2810. Which of the following has the lowest flash point of all?

Diesel

Kerosene

Petrol

Furnace oil

✅ The correct answer is option C.