When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?

A. Inertial forces control and viscous forces are unimportant
B. Viscous forces predominate
C. Inertial forces are unimportant and viscous forces control
D. None of these

A. Solids
B. Liquids
C. Fluids
D. Slurries

A. The length of entrance region of pipe, in which full development of fluid flow takes place
such that velocity profile does not change downstream, is called the transition length
B. Transition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to
0.05. D.NRe
C. Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is
equal to 50 D
D. All A., B. and C.

A. Shear stress to gravitational stress
B. Drag stress to shear stress
C. Inertial stress to shear stress
D. Inertial stress to gravitational stress

A. 0.42
B. 0.62
C. 0.82
D. 0.98

A. Have the same diameter
B. Have different diameters
C. Are directly coupled
D. None of these