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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.

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.

Nusselt number is the ratio of the temperature gradient at the wall to_________________?

A Temperature difference

B Heat flux

C That across the entire pipe

D None of these

Review Detailed Answer

Correct Answer: That across the entire pipe

What is the unit of thermal conductivity ?

A Kcal/hr. m2 °C

B Kcal/hr.m.°C

C Kcal/hr.m

D Kcal/hr. °C

Review Detailed Answer

Correct Answer: Kcal/hr.m.°C

Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeping_________________?

A Both the tube sheets fixed

B Both the tube sheets floating

C The top tube sheet floating and bottom tube sheet fixed

D The top tube sheet fixed and the bottom tube-sheet floating

Review Detailed Answer

Correct Answer: Both the tube sheets fixed

What is the emissivity of a black body ?

A 0

B 1

C 0.5

D 0.90

Review Detailed Answer

Correct Answer: 1

In SI units, thermal conductivity is expressed in__________________?

A Watt/m.°K

B Watt/m2. °K

C Watt/m2. °K

D Watt/m4. °K

Review Detailed Answer

Correct Answer: Watt/m.°K

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

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 __________________?

Nusselt number is the ratio of the temperature gradient at the wall to_________________?

What is the unit of thermal conductivity ?

Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeping_________________?

What is the emissivity of a black body ?

In SI units, thermal conductivity is expressed in__________________?