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.

1501. Solid angle subtended by the finite surface at the radiating element is

Called the view factor

Called the angle of vision

Proportional to the square of the distance between surfaces

Expressed in terms of radians

✅ The correct answer is option B.

1502. Dropwise condensation occurs on __________ surfaces.

Clean and dirt free

Smooth clean

Contaminated cooling

Polished

✅ The correct answer is option C.

1503. Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Flow of fluid on the tube and shell sides

Oscillations in the flow of shell/tube sides fluid

Vibrations transmitted through piping and/or supports due to external reasons

All of the above

✅ The correct answer is option D.

1504. The energy radiated from a surface Q at absolute temperature T is related as

Q ∝ T²

Q ∝ T⁴

Q ∝ T³

None of these

✅ The correct answer is option B.

1505. All analogy equations connecting friction factor and heat transfer co-efficient apply only to

Wall or skin friction

Form friction

Both A and B

Turbulent flow

✅ The correct answer is option A.

1506. Which one gives the monochromatic emissive power for black body radiation?

Planck’s law

Kirchhoffs law

Wien’s law

Stefan-Boltzman law

✅ The correct answer is option A.

1507. A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

t = 283 s

t = 356 s

t = 400 s

t = 800 s

✅ The correct answer is option D.

1508. Evaporator tubes are generally

Horizontal

Vertical

Inclined

Random

✅ The correct answer is option B.

1509. jH factor for heat transfer depends upon the __________ number.

Biot

Nusselt

Reynolds

Prandtl

✅ The correct answer is option C.

1510. The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

Increases

Decreases

Remains constant

May increase or decrease ; depends on the material

✅ The correct answer is option D.