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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

A 0.5

B < 0.5

C > 0.6

D < 0.1

Review Detailed Answer

Correct Answer: > 0.6

The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?

A 1200 W/m2.K

B 894 W/m2.K

C 333 W/m2.K

D 287 W/m2.K

Review Detailed Answer

Correct Answer: 333 W/m2.K

Cpμ/K is termed as the ______________ number?

A Grashoff

B Nusselt

C Prandtl

D Stanton

Review Detailed Answer

Correct Answer: Prandtl

In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?

A Increases

B Decreases

C Remain constant

D May increase or decrease, depends on the vacuum

Review Detailed Answer

Correct Answer: Increases

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?

A More

B Less

C Same

D More or less; depends on the nature of solution

Review Detailed Answer

Correct Answer: More

Maximum heat transfer rate is obtained in ______________ flow?

A Laminar

B Turbulent

C Creeping

D Transition region

Review Detailed Answer

Correct Answer: Turbulent

Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?

A t

B 1/ρ

C 1/A

D All A., B. & C.

Review Detailed Answer

Correct Answer: All A., B. & C.

In a shell and tube heat exchanger, floating head is used for _________________?

A Large temperature differentials

B High heat transfer co-efficient

C Low pressure drop

D Less corrosion of tubes

Review Detailed Answer

Correct Answer: Large temperature differentials

Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?

A For fluids in laminar flow

B For fluids in turbulent flow

C When Grashoff number is very important

D For liquid metals

Review Detailed Answer

Correct Answer: For fluids in turbulent flow

With increase in temperature, the total emissivity of conductors____________________?

A Increases

B Decreases

C Remain same

D Decreases linearly

Review Detailed Answer

Correct Answer: Increases

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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All Topics 9594

At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?

Cpμ/K is termed as the ______________ number?

In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?

Maximum heat transfer rate is obtained in ______________ flow?

Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?

In a shell and tube heat exchanger, floating head is used for _________________?

Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?

With increase in temperature, the total emissivity of conductors____________________?