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.Management Sciences
Category: Fluid Mechanics for Chemical
Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) ?
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A. D = 1840 H0.5/N
B. D = 1840 N/H0.5
C. H = 1840 D0.5/N
D. D = 1840 H/N
Which law is followed by the velocity distribution in the turbulent boundary layer ?
A. Parabolic law
B. Linear law
C. Logarithmic law
D. None of these
Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ?
A. FL-2T, ML-1T-1
B. FLT, ML-1T-1
C. ML-1T-3, F-1L2T
D. F-1L2T-1, MLT-3
For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the centre line of the pipe, and it follows a ______________ relationship?
A. Logarithmic
B. Parabolic
C. Hyperbolic
D. Linear
In an incompressible fluid, the density is____________________?
A. Greatly affected by moderate changes in pressure
B. Greatly affected only by moderate changes in temperature
C. Not affected with moderate change in temperature & pressure
D. Sensible to changes in both temperature & pressure
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?
A. √(HW/π)
B. HW/2 (H + W)2
C. HW/4 (H + W)2
D. 2HW/(H + W)
Medium viscosity lubricating oil can be most ideally pumped by a ______________ pump?
A. Vane
B. Piston
C. Centrifugal
D. Plunger
Choking in case of pipe flow means that a___________________?
A. Specified mass flow rate cannot be achieved
B. Valve is closed in the line
C. Restriction in flow cross-section area occurs
D. None of these
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