Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

It gives maximum discharge for a given cross-sectional area and bed slope
It has minimum wetted perimeter
All of these
It involves lesser excavation for the designed amount of discharge

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

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

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