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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

Pick out the correct statement?
A A forced vortex occurs when fluid rotates as a solid about an axis
B In laminar flow, Newton’s law of viscosity does not apply
C A free vortex occurs, when fluid rotates as a solid
D In turbulent flow, there are neither cross-currents nor eddies
Correct Answer: A forced vortex occurs when fluid rotates as a solid about an axis
Pick out the wrong statement ?
A In a static mass of liquid, the pressure at a point is the same for all liquids
B Pressure decreases exponentially with elevation in an isothermal atmosphere
C Atmospheric pressure = absolute pressure ‒ gage pressure
D As per Pascal’s law, the pressure at a point in a static or uniformly moving fluid is equal in all
Correct Answer: In a static mass of liquid, the pressure at a point is the same for all liquids
Pick out the correct statement pertaining to the flow through a converging-diverging tube ?
A The value of Mach number is always unity at the throat
B No shock wave develops in the tube when the Mach number at exit is greater than unity
C Throughout the converging portion of the tube, the density increases in the downstream
D None of these
Correct Answer: No shock wave develops in the tube when the Mach number at exit is greater than unity
Pick out the wrong statement?
A The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp
B In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively
C Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion
D With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Correct Answer: With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Pick out the wrong statement?
A The vacuum pressure is always the negative gauge pressure
B The pressure of the liquid measured by a piezometer tube is the gauge pressure
C Manometric liquid should have high surface tension
D The point at which the resultant pressure on an immersed surface acts, is known as the centre
Correct Answer: The point at which the resultant pressure on an immersed surface acts, is known as the centre
Pick out the correct statement?
A Fanning friction factor is inversely proportional to Reynolds number always
B The property of a randomly packed bed (with raschig rings) is given by the ratio of the total
C Mach number in an incompressible fluid is always unity
D Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under
Correct Answer: Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under
Pick out the wrong statement about cavitation?
A Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
B Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in
C Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines
D Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine
Correct Answer: Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine
A globe valve is the most suitable for applications, in which____________________?
A Fluid flow control is required
B Fluid contains dispersed solid particles
C Valve is required to be either fully open or fully closed
D One way flow is required
Correct Answer: Fluid flow control is required
Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?
A m
B n
C n-m
D n/m
Correct Answer: m
When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?
A Ejector
B Blower
C Injector
D Airlift
Correct Answer: Airlift
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