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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 thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are _______________?
A (COP)R = (COP)HP = 0.6
B (COP)R = 2.5; (COP)HP = 1.5
C (COP)R = 1.5; (COP)HP = 2.5
D (COP)R = (COP)HP = 2.5
Correct Answer: (COP)R = 1.5; (COP)HP = 2.5
Heat transfer rate per unit area is called_________________?
A Thermal conductivity
B Heat flux
C Heat transfer co-efficient
D Thermal diffusivity
Correct Answer: Heat flux
Tube pitch is the _______________ of tube diameters and the clearances?
A Sum
B Difference
C Ratio
D None of these
Correct Answer: Sum
A black body when hot, emits heat radiation of _____________ wavelengths?
A Small
B Large
C All
D One fixed
Correct Answer: All
With increase in temperature, the thermal conductivity of non-metallic amorphous solids_________________?
A Decreases
B Increases
C Remain constant
D First decreases upto certain temperature and then increases
Correct Answer: Increases
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
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