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.

7101. Which of the following assumes constant molal vaporisation and overflow?

McCabe-Thiele method

Ponchan-Savarit method

Enthalpy concentration method

Plate absorption column

✅ The correct answer is option A.

7102. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Schmidt

Sherwood

Peclet

Stanton

✅ The correct answer is option A.

7103. Detergent solution is dried to a powder in a

Spray dryer

Spouted bed dryer

Tunnel dryer

Pan open to atmosphere

✅ The correct answer is option A.

7104. The Knudsen diffusivity is dependent on the

Molecular velocity only

Pore radius of the catalyst only

Molecular mean free path only

Molecular velocity and por radius of the catalyst

✅ The correct answer is option D.

7105. In case of constant underflow extraction operation, the __________ at all solute concentration.

Solids are drained to the same extent

Ratio of the insoluble to solution is constant

Both A & B

Neither A nor B

✅ The correct answer is option C.

7106. The cooling effect in a cooling tower can not be increased by

Increasing the air velocity over the wet surfaces

Reducing the humidity of entering air

Lowering the barometric pressure

None of these

✅ The correct answer is option D.

7107. Penetration model (theory) for mass transfer was enunciated by

Danckwerts

Toor and Marchello

Higbie

Kissinevskii

✅ The correct answer is option C.

7108. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

100

✅ The correct answer is option B.

7109. When a multistage tray tower uses a minimum reflux ratio, it implies

Infinite trays and maximum reboiler heat load

Infinite trays and minimum reboiler heat load

Minimum trays and minimum reboiler heat load

Minimum trays and maximum reboiler heat load

✅ The correct answer is option A.

7110. Entrainer used in azeotropic distillation should

Form a low boiling azeotrope with one of the constituents of the mixture

Form a new azeotrope of low relative volatility with one of the constituents of the mixture

Have high latent heat of vaporisation

Have high viscosity to provide high tray efficiency

✅ The correct answer is option A.