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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

What is the logarithmic mean of r1 and r2 ?
A (r1 – r2)/ln(r1/r2)
B (r1 – r2)/ln(r2/r1)
C (r2 – r1)/ln(r1/r2)
D (r1 – r2)/-ln(r1/r2)
Correct Answer: (r1 – r2)/ln(r1/r2)
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?
A 2.36
B 4.36
C 120.36
D Dependent on NRe only
Correct Answer: 4.36
The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?
A Average
B Geometric mean
C Product
D Sum
Correct Answer: Sum
Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re 0.8. Pr n, is not valid, if the value of __________________?
A n = 0.4 is used for heating
B n = 0.3 is used for cooling
C Reynolds number for the flow involved is > 10000
D Reynolds number for the flow involved is < 2100
Correct Answer: Reynolds number for the flow involved is < 2100
An ejector is used to__________________?
A Increase pressure
B Increase temperature
C Remove condensate
D None of these
Correct Answer: None of these
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
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