Hydraulics and Fluid Mechanics in ME
Slip of a reciprocating pump is negative, when

Suction pipe is short and pump is running at low speeds
Delivery pipe is long and pump is running at high speeds
Suction pipe is short and delivery pipe is long and the pump is running at low speeds
Suction pipe is long and delivery pipe is short and the pump is running at high speeds

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Hydraulics and Fluid Mechanics in ME
Buoyant force is

The resultant force acting on a floating body
Equal to the volume of liquid displaced
The resultant force on a body due to the fluid surrounding it
The force necessary to maintain equilibrium of a submerged body

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