The important parameters describing the performance of a hydraulic machine are: P the power input, H the head produced across the machine and the efficiency, η. For a given geometrical design of the machine, the performance is characterized by the variables:H – the head increase across the machine ρ – the fluid density, ω – the angular velocity of the rotor, D – the diameter of the rotor, μ – the fluid viscosity and Q – the flow rate; and both P and η are expressed through these variables. How many non-dimensional parameters are involved herein? Gravitational acceleration g has also to be considered necessarily?

The important parameters describing the performance of a hydraulic mac

1.	The important parameters describing the performance of a hydraulic machine are: P the power input, H the head produced across the machine and the efficiency, η. For a given geometrical design of the machine, the performance is characterized by the variables:H – the head increase across the machine ρ – the fluid density, ω – the angular velocity of the rotor, D – the diameter of the rotor, μ – the fluid viscosity and Q – the flow rate; and both P and η are expressed through these variables. How many non-dimensional parameters are involved herein? Gravitational acceleration g has also to be considered necessarily?
A.	7
B.	6
C.	5
D.	4
Answer» E.