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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

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?
A Condensation
B Grashoff
C Stanton
D Brinkman
Correct Answer: Brinkman
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?
A Keeping the heat transfer surface clean
B Enhancing the fluid pumping rate
C Increasing the tube length
D None of these
Correct Answer: Keeping the heat transfer surface clean
Which is the most suitable for the concert-ration of highly concentrated solution ?
A Open pan evaporation
B Long tube vertical evaporator
C Agitated film evaporator
D None of these
Correct Answer: Open pan evaporation
A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?
A Ellipse
B Straight line
C Parabola
D Circular arc
Correct Answer: Straight line
Maximum heat transfer rate can be expected in case of_________?
A Laminar flow
B Co-current flow
C Turbulent flow
D Heat flow rate is independent of nature of flow
Correct Answer: Turbulent flow
Baffles are provided in heat exchangers to____________?
A Remove dirt
B Increase heat transfer rate
C Reduce vibrations
D Reduce heat transfer rate
Correct Answer: Increase heat transfer rate
Pick out the correct statement ?
A 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F
B In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
C In unsteady state heat conduction, heat flows in the direction of temperature rise
D In heat transfer by forced convection, Grashoff number is very important
Correct Answer: In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
Pick out the wrong statement ?
A Heat transfer from a hot body to cold body by the emission of heat waves is called radiation
B Filmwise condensation takes place on non-wettable surfaces
C The boiling point of a solution is affected by liquid head as well as boiling point elevation
D None of these
Correct Answer: Filmwise condensation takes place on non-wettable surfaces
Pick out the wrong statement?
A Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection
B The ratio NNu/NRe . Npr is called the Stanton number
C The Peclet number is a measure of the ratio of energy transport by convection to that by conduction
D The Colburn jH factor for heat transfer is given by Nst Npr
Correct Answer: The Colburn jH factor for heat transfer is given by Nst Npr
Pick out the wrong statement?
A Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling
B Thermal conductivity of a dry material is more than that of the damp material
C Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator
D Vaporisation of organic substances in evaporator mostly causes foam formation
Correct Answer: Thermal conductivity of a dry material is more than that of the damp material
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