Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

Surface tension
Cohesion of the liquid
All of the listed here
Adhesion of the liquid molecules and the molecules on the surface of a solid

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Hydraulics and Fluid Mechanics in ME
Slip of a reciprocating pump is defined as the

Ratio of actual discharge to the theoretical discharge
Product of theoretical discharge and the actual discharge
Difference of theoretical discharge and the actual discharge
Sum of actual discharge and the theoretical discharge

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