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.

In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m2.s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m2/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is______________________?

A 2000

B 4000

C 5000

D 6000

Review Detailed Answer

Correct Answer: 5000

Peclet number (Pe) is given by____________________?

A Pe = Re.Pr

B Pe = Re/Pr

C Pe = Pr/Re

D Pe = Nu.Re

Review Detailed Answer

Correct Answer: Pe = Re.Pr

In Fourier’s law, the proportionality constant is called the______________________?

A Heat transfer co-efficient

B Thermal diffusivity

C Thermal conductivity

D Stefan-Boltzmann constant

Review Detailed Answer

Correct Answer: Thermal conductivity

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is _______________?

A Free convection

B Entry length problem in laminar forced conduction (developing thermal boundary layer)

C Mixed convection (both free and forced)

D Forced convection

Review Detailed Answer

Correct Answer: Mixed convection (both free and forced)

The units of resistance to heat transfer is _____________________?

A J.m-2.K-1

B J.m-1.K-1

C W.m-2.K-1

D W-1m2K

Review Detailed Answer

Correct Answer: W-1m2K

For hot feed, forward feeding as compared to backward feeding results in ______________ economy?

A Increased

B Decreased

C No effect on

D None of these

Review Detailed Answer

Correct Answer: Increased

In sub-cooled boiling ?

A Temperature of the heating surface is less than the boiling point of the liquid

B Temperature of the heating surface is more than the boiling point of the liquid

C Bubbles from heating surface are absorbed by the mass of the liquid

D Very large vapour space is necessary

Review Detailed Answer

Correct Answer: Temperature of the heating surface is more than the boiling point of the liquid

Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?

A Between two bodies in physical contact with each other

B Between two bodies not in physical contact with each other

C From one part of a body to the another part of the same body

D Both B & C

Review Detailed Answer

Correct Answer: Between two bodies not in physical contact with each other

The thickness of condensate layer in filmwise condensation depends on the__________________?

A Condensation rate

B Surface configuration

C Liquid flow rate from the surface

D All A., B. and C.

Review Detailed Answer

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

The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?

A Greater than

B Lower than

C Is same as

D Half

Review Detailed Answer

Correct Answer: Lower than

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Peclet number (Pe) is given by____________________?

In Fourier’s law, the proportionality constant is called the______________________?

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is _______________?

The units of resistance to heat transfer is _____________________?

For hot feed, forward feeding as compared to backward feeding results in ______________ economy?

In sub-cooled boiling ?

Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?

The thickness of condensate layer in filmwise condensation depends on the__________________?

The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?