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
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
Delivery pipe is long and pump is running at high speeds

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Hydraulics and Fluid Mechanics in ME
If a vessel containing liquid moves downward with a constant acceleration equal to ā€˜gā€™ then

there will be vacuum in the liquid
the pressure in the liquid mass is greater than hydrostatic pressure
None of these
the pressure throughout the liquid mass is atmospheric

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