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.

2511. A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.

✅ The correct answer is option B.

2512. Diesel index.(an alternative index for expressing the quality of diesel) is

determined by using a test engine.

not related to aniline point.

equal to cetane number plus 3.

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

✅ The correct answer is option C.

2513. Which of the following additives improves the cetane number of diesel ?

Amyl nitrate

Ethyl mercaptan

Napthenic acid

Tetra ethyl lead

✅ The correct answer is option A.

2514. Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

80 and 97

95 and 100

40 and 70

25 and 97

✅ The correct answer is option A.

2515. Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?

Tube side pressure drop and the heat transfer rate

Convective heat transfer co-efficient

Effective tube surface area for convective heat transfer

All of the above

✅ The correct answer is option D.

2516. __________ paint has the minimum absorption co-efficient.

Black

White lead

Grey

Light cream

✅ The correct answer is option B.

2517. Which of the following is not an important property of fuel oil/furnace oil ?

Sulphur content

Viscosity

Aniline point

Flash point

✅ The correct answer is option C.

2518. Sulphur content in lighter and heavier petroleum products is generally determined respectively by

lamp method and bomb method.

bomb method and lamp method.

bomb method and quartz tube method.

quartz tube method and lamp method.

✅ The correct answer is option B.

2519. The colour of gasoline is an indication of its

octane number.

lead susceptibility.

gum forming tendency & thoroughness of refining.

none of these.

✅ The correct answer is option C.

2520. Nusselt number is the ratio of the

Temperature gradient of the wall to that across the entire pipe

Temperature difference to the temperature gradient at the wall

Heat flux at the wall to that across the entire pipe

None of these

✅ The correct answer is option C.