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.

7531. The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Liquid side

Gas side

Interfacial

Both liquid and gas side

✅ The correct answer is option B.

7532. The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Long tube

Short tube

Vacuum

Falling film

✅ The correct answer is option A.

7533. In distillation, overhead product contains

Only one component

Two components

Any number of components

Only saturated liquid

✅ The correct answer is option C.

7534. Dryer widely used in a textile industry is __________ dryer.

Festoon

Cylinder

Conveyor

Tunnel

✅ The correct answer is option C.

7535. Drift in a cooling tower is

The water entrained by the circulating air

Dependent on the water lost by evaporation

Desirable

All of the above

✅ The correct answer is option A.

7536. As the reflux ratio in a distillation coloumn is increased from the minimum, the

Slope of the operating line in stripping section decreases

Number of plates decreases very slowly first and then more and more rapidly

Total cost first decreases and then increases

Liquid flow increases while the vapor flow decreases for a system

✅ The correct answer is option C.

7537. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

Electrical resistance

Thermal conductivity

Strength

None of these

✅ The correct answer is option A.

7538. A binary mixture of benzene and cyclohexane is separated by

Flash vaporisation

Extractive distillation

Solvent extraction

Ordinary distillation

✅ The correct answer is option B.

7539. Mass transfer co-efficient is defined as

Flux = Co-efficient/concentration difference

Co-efficient = Flux/concentration difference

Flux=concentration difference/co-effi-cient

None of these

✅ The correct answer is option B.

7540. Ponchan-Savarit method analyses the fractional equipment based on

Enthalpy balance only

Material balance only

Both enthalpy and material balances

The assumption of constant molaloverflow

✅ The correct answer is option C.