Which of the following facilitates close control of flow of fluids ?

A. Vane
B. Piston
C. Centrifugal
D. Plunger

A. Reynolds
B. Mach
C. Euler
D. Weber

A. Screw
B. Reciprocating
C. Gear
D. Centrifugal

A. Area of surface in contact
B. Flow velocity
C. Fluid temperature
D. Pressure of flow

A. Electromagnetic pump
B. Centrifugal pump
C. Reciprocating pump
D. Gear pump

A. Buoyancy = weight + drag
B. Weight = buoyancy + drag
C. Drag = buoyancy + weight
D. Drag = weight