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Maximum volume flow rate through pump occurs when 
1. Net head is maximum
2. Net head is zero
3. Pump operates at best efficiency point
4. Net head is greater than zero but less than maximum

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Correct Answer - Option 2 : Net head is zero

Volume flow rate:

Volume flow rate is the capacity and is simply mass flow rate divided by density.

\(̇ Q=\frac{̇ m}{\rho}\)

The performance of a pump is characterized by its net head H

\(H=({\frac{P}{{ρ g}} + \frac{{{v^2}}}{{2g}} + z})_{out}-({\frac{P}{{ρ g}} + \frac{{{v^2}}}{{2g}} + z})_{in}\)

Pump Performance

The maximum volume flow rate through a pump occurs when its net head (H) is zero. This flow rate is called Pump's free delivery. 

The free delivery condition is achieved when there is no flow restriction at the pump inlet or outlet, in other words there is no load on the pump.

At this operating point, Q̇ is large, but H is zero. 

The pump's efficiency is also zero because the pump is doing no useful work.

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