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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

With increase in temperature, the thermal conductivity of a gas ___________________?
A Increases
B Decreases
C Remain same
D May increase or decrease depending on the type of gas
Correct Answer: Increases
Which area is used in case of heat flow by conduction through a cylinder ?
A Logarithmic mean area
B Arithmetic mean area
C Geometric mean area
D None of these
Correct Answer: Logarithmic mean area
The rate of emission of radiation by a body does not depend upon the__________________?
A Wavelength of radiation
B Surface temperature of the body
C Nature of the surface
D Shape and porosity of the body
Correct Answer: Shape and porosity of the body
In a cooling tower, water becomes cool by________________?
A Loosing sensible heat
B Heat transfer to surroundings
C Vaporisation due to heat loss to air
D Loosing latent heat
Correct Answer: Loosing sensible heat
Out of the following four assumptions used in the derivation of the equation for LMTD [LMTD = (Δt1 – Δt2)/ln(Δt1/Δt2)], which one is subject to the largest deviation in practice ?
A Constant overall heat transfer co-efficient.
B Constant rate of fluid flow
C Constant specific heat
D No partial phase change in the system
Correct Answer: Constant rate of fluid flow
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
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