A. Butterfly valve
B. Globe valve
C. Needle valve
D. None of these
A. Increase
B. Decrease
C. Not change
D. Exponentially decrease
A. Wetted perimeter to flow area
B. Flow area to wetted perimeter
C. Flow area to square of wetted perimeter
D. Square root of flow area to wetted perimeter
A. Not a function of the roughness of pipe wall
B. Inversely proportional to Reynolds number
C. Both A. & B.
D. Neither A. nor B.
A. Frictionless & incompressible
B. One, which obeys Newton’s law of viscosity
C. Highly viscous
D. None of these
A. An elementary wave in an open channel
B. Flow in an open channel
C. A disturbance travelling upstream in moving fluid
D. None of these
A. Rough and smooth pipes have the same friction factor
B. Laminar film covers the roughness projections
C. Friction factor depends upon NRe only
D. Friction factor is independent of the relative roughness