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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.

Finned tube heat exchangers__________________?

A Give larger area per tube

B Use metal fins of low thermal conductivity

C Facilitate very large temperature drop through tube wall

D Are used for smaller heat load

Review Detailed Answer

Correct Answer: Give larger area per tube

Fruit juice (a heat sensitive material) can be concentrated in a ____________ evaporator?

A Long tube

B Falling film

C High pressure

D None of these

Review Detailed Answer

Correct Answer: Falling film

The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter D. as _________________?

A D-1.8

B D-0.2

C D0.2

D D1.8

Review Detailed Answer

Correct Answer: D-0.2

For heat flow through very thick walled cylinder, use ___________mean radius?

A Arithmetic

B Logarithmic

C Geometric

D Either A. or C.

Review Detailed Answer

Correct Answer: Logarithmic

In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?

A Tube layout

B Tube diameter

C Tube pitch

D Number of baffles

Review Detailed Answer

Correct Answer: Tube diameter

LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?

A Parallel

B Mixed

C Counter flow

D Same in either A , B. or C.

Review Detailed Answer

Correct Answer: Same in either A , B. or C.

The maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?

A Supersaturated

B Saturated

C Wet

D None of these

Review Detailed Answer

Correct Answer: Saturated

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?

A More

B Less

C Some

D Either more or less; depends on the nature of vapor

Review Detailed Answer

Correct Answer: Some

Which of the following has maximum thermal conductivity ?

A Iron

B Coal

C Nitrogen

D Tar

Review Detailed Answer

Correct Answer: Iron

Thermal diffusivity of a material __________________?

A Has the unit m2 /sec

B Is defined as K/ρ . Cp

C Is the ratio of thermal conductivity to thermal capacity

D All A., B. and C.

Review Detailed Answer

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

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Finned tube heat exchangers__________________?

Fruit juice (a heat sensitive material) can be concentrated in a ____________ evaporator?

The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter D. as _________________?

For heat flow through very thick walled cylinder, use ___________mean radius?

In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?

LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?

The maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?

Which of the following has maximum thermal conductivity ?

Thermal diffusivity of a material __________________?