The curve of metacentre for a floating body __________ the curve of buoyancy.
A. Is always below
B. Is the evolute of
C. Intersects at right angle
D. Is tangential to
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At a constant speed of the centrifugal pump . it __________ the impeller diameter.
A. Capacity varies directly with
B. Head varies as the square of
C. Horsepower varies as the cube of
D. All of the above
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Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.
A. Non-viscous
B. Viscous
C. Turbulent
D. Rotational
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In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
A. Directly proportional to
B. Inversely proportional to
C. Inversely proportional to the square root of
D. Independent of
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For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.
A. Brings about no further reduction of
B. Increases
C. Decreases
D. None of these
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Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate.
A. Elastic
B. Viscous
C. Gravity
D. None of these
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In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)
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Fanning friction factor is equal to (where, fB = Blassius friction factor).
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For the free settling of a spherical particle through a fluid, the slope of, CD -log NRe , plot is
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Various efficiencies of a centrifugal pump are related as (where, ηm = mechanical efficiency ηv = volumetric efficiency. ηma = manometric efficiency ηo = overall efficiency)
A. ηma × ηm × ηv = ηo
B. ηm = ηv × ηma
C. ηma = ηm × ηv
D. ηv = ηm × ηma
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f = 16/NRe , is valid for
A. Turbulent flow
B. Laminar flow through an open channel
C. Steady flow
D. None of these
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A fluid is a substance, that
A. Has to be kept in a closed container
B. Is almost incompressible
C. Has zero shear stress
D. Flows when even a small shear is applied to it
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A fluid is the one, which
A. Cannot remain at rest under the action of shear force
B. Continuously expands till it fills any container
C. Is incompressible
D. Permanently resists distortion
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Slugging occurs in a fluidised bed, if the bed is
A. Narrow
B. Deep
C. Both A & B
D. Neither A nor B
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A gas
A. Signifies absence of density
B. Can resist shearing action
C. Is incompressible
D. Is a supercritical vapor
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A mixed flow centrifugal pump
A. Employs such an impeller, through which the flow is a combination of radial & axial flow
B. Mixes the two fluids before pumping them
C. Pumps the two fluids separately and then mixes them
D. Employs impellers in both the radial & axial directions
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A Newtonion fluid is that
A. Which follows Newton
B. Which needs a minimum shear, before it starts deforming
C. For which shear & deformation are related as τ = μ ∂ y ∂ u
D. None of these
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With increase in the schedule number of a pipe of a particular nominal size, the
A. Wall thickness also increases
B. I.D. of the pipe decreases
C. O.D. of the pipe remains constant
D. All of the above
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A perfect gas
A. Does not satisfy PV = nRT
B. Is incompressible and has zero viscosity
C. Has constant specific heat
D. Can't develop shear stresses
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The schedule number of a pipe is an indication of its
A. Size
B. Roughness
C. Material density
D. Wall thickness
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