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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

The absorptivity of a body is equal to its emissivity _________________?
A At a particular temperature
B For circular bodies
C Under thermal equilibrium
D None of these
Correct Answer: Under thermal equilibrium
A perfect black body is a perfect _____________ of radiation?
A Absorber
B Emitter
C Both A. & B.
D Neither A. nor B.
Correct Answer: Both A. & B.
jH factor for heat transfer depends upon the ____________ number?
A Biot
B Nusselt
C Reynolds
D Prandtl
Correct Answer: Reynolds
The actual temperature drop across the heating surface of an evaporator depends on the_______________?
A Liquid depth over the heating surface
B Solution being evaporated
C Pressure difference between the steam chest and the vapor space above the boiling liquid
D All A., B. and C.
Correct Answer: All A., B. and C.
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
A 0.2
B 0.4
C 0.6
D 0.8
Correct Answer: 0.6
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?
A Heat transfer co-efficient are high
B There is no risk of contamination
C There is no mist formation
D Cost of equipment is lower
Correct Answer: There is no risk of contamination
Which of the following has the lowest overall heat transfer co-efficient ?
A Dowtherm
B Molten sodium
C Water
D Air
Correct Answer: Air
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?
A Long vertical evaporator
B Horizontal tube evaporator
C Agitated film evaporator
D Calandria vertical tube evaporator
Correct Answer: Agitated film evaporator
The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?
A Increases
B Decreases
C Remain constant
D May increase or decrease; depends on the material
Correct Answer: May increase or decrease; depends on the material
In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?
A Geometric
B Arithmetic
C Logarithmic
D Either A., B. or C.
Correct Answer: Logarithmic
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