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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

Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger ?
A Tube side pressure drop and the heat transfer rate
B Convective heat transfer co-efficient
C Effective tube surface area for convective heat transfer
D All A. B. and C.
Correct Answer: All A. B. and C.
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?
A 0.5
B 2
C 10
D 100
Correct Answer: 2
The main purpose of providing fins on heat transfer surface is to increase the_________________?
A Temperature gradient
B Mechanical strength of the equipment
C Heat transfer area
D Heat transfer co-efficient
Correct Answer: Heat transfer area
When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as ___________________ boiling?
A Pool
B Nucleate
C Transition
D Film
Correct Answer: Film
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in °C is____________________?
A 77.2
B 71.2
C 63.8
D 48.7
Correct Answer: 48.7
Agitated film evaporator is suitable for concentrating _____________ liquids?
A Foaming
B Viscous
C Very thin
D Corrosive
Correct Answer: Viscous
Kirchoff’s law is applicable to________________?
A Monochromatic radiation only
B Total radiation only
C Both A. and B.
D Only volumes and not to surfaces
Correct Answer: Both A. and B.
The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?
A Low Reynold’s number
B Very low Grashoff number
C Molten metals
D All A., B. and C.
Correct Answer: All A., B. and C.
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is_____________________?
A 11.2 kW/m2
B 12.0 kW/m2
C 14.6 kW/m2
D 16.5 kW/m2
Correct Answer: 16.5 kW/m2
A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?
A 125
B 133
C 150
D 160
Correct Answer: 160
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