Hydraulics and Fluid Mechanics in ME
The absolute pressure is equal to

Gauge pressure - atmospheric pressure
Gauge pressure + atmospheric pressure
Gauge pressure - vacuum pressure
Atmospheric pressure - gauge pressure

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Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

The sloping side is equal to the width at the bottom
The sloping side is equal to half the width at the top
Width of channel at the top is equal to twice the width at the bottom
Depth of channel is equal to the width at the bottom

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