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)

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

A. Ejector
B. Blower
C. Injector
D. Airlift

Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?

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

A globe valve is the most suitable for applications, in which____________________?

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