Hydraulics and Fluid Mechanics in ME
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

less than d
between 1.5 d and 2d
greater than 2d
between d and 1.5 d

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Hydraulics and Fluid Mechanics in ME
The total energy of a liquid particle in motion is equal to

Pressure energy - (kinetic energy + potential energy)
Pressure energy + kinetic energy + potential energy
Kinetic energy - (pressure energy + potential energy)
Potential energy - (pressure energy + kinetic energy

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