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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.

Forced circulation evaporators are normally used for concentrating liquids having ___________________?

A Scaling characteristics

B High viscosity

C Both A. & B.

D Neither A. nor B.

Review Detailed Answer

Correct Answer: Both A. & B.

The equation, Nst = f/2, is the _____________ analogy?

A Colburn

B Reynolds

C Prandtl

D None of these

Review Detailed Answer

Correct Answer: Reynolds

Which of the following is directly concerned with the heat transfer ?

A Strouhal number

B Sherwood number

C Euler number

D Grashoff number

Review Detailed Answer

Correct Answer: Grashoff number

The thermal boundary layer at NPr > 1 ?

A Is thicker than hydrodynamic boundary layer

B Is thinner than hydrodynamic boundary layer

C And the hydrodynamic boundary layers are identical

D Disappears

Review Detailed Answer

Correct Answer: Is thinner than hydrodynamic boundary layer

Nucleate boiling is promoted ___________________?

A On polished surfaces

B On rough surfaces

C In the absence of agitation

D None of these

Review Detailed Answer

Correct Answer: On rough surfaces

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

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Forced circulation evaporators are normally used for concentrating liquids having ___________________?

The equation, Nst = f/2, is the _____________ analogy?

Which of the following is directly concerned with the heat transfer ?

The thermal boundary layer at NPr > 1 ?

Nucleate boiling is promoted ___________________?

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 ________________?