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.

1371. Unsteady state heat conduction occurs, when

Temperature distribution is independent of time

Temperature distribution is dependent on time

Heat flows in one direction only

Three dimensional heat flow is concerned

✅ The correct answer is option B.

1372. The thermal boundary layer at NPr > 1

Is thicker than hydrodynamic boundary layer

Is thinner than hydrodynamic boundary layer

And the hydrodynamic boundary layer are identical

Disappears

✅ The correct answer is option B.

1373. The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K= 0.04 W/m.°K and thickness 0.16m is 10 W/m². The temperature of the inside wall is – 5°C. The outside wall temperature is

25°C

30°C

35°C

40°C

✅ The correct answer is option C.

1374. The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Wavelength of radiation

Nature of the body

Temperature of the body

None of these

✅ The correct answer is option C.

1375. Grashhoff number is given by

gD³.β.Δtρ²/μ²

gD2βΔtρ/μ²

gD2βΔtP²μ

gD³βΔtP²/μ

✅ The correct answer is option A.

1376. For what value of Prandtl number, the Col-burn analogy is valid?

0.06 to 120

0.6 to 120

1 to 103

L to 50

✅ The correct answer is option B.

1377. While the total emissivity of a perfect black body is unity, the same for a real body is

> 1

Between 0 and 1

✅ The correct answer is option D.

1378. In a shell and tube heat exchanger, floating head is used for

Large temperature differentials

High heat transfer co-efficient

Low pressure drop

Less corrosion of tubes

✅ The correct answer is option A.

1379. Kirchoff s law applies to __________ radiation.

Total

Monochromatic

Both A & B

Neither A nor B

✅ The correct answer is option C.

1380. Which is the most suitable for the concentration of foamy & frothy liquors?

Agitated film evaporator

Long tube vertical evaporator

Open pan evaporator

None of these

✅ The correct answer is option B.