Fluid Mechanics for Chemical

A. Momentum transfer in laminar flow results from velocity gradient
B. A fluid in equilibrium is not free from shear stress
C. The viscosity of a non-Newtonian fluid is a function of temperature only
D. Both B. and C.

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

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
directions

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
direction
D. None of these

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

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
of gravity

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
volume to the volume of voids in the bed
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
conditions of flow

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
formation & collapse of vapor cavities
C. Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines
resulting in audible noise
D. Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine
blades

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

A. m
B. n
C. n-m
D. n/m