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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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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.

All Topics  9594

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
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
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
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
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
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
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
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
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.
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
Correct Answer: Lower than
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