Pump's free delivery

In pumps a specific flow rate is called pump's free delivery.

It will occur when pump's net head is zero.

This flow rate is the maximum flow rate through a pump.

Question

 * 1) At what pump head value, maximum volume flow rate will occur?
 * 2) Does pump's free delivery is a name to indicate a specific flow rate?

Answers

 * 1) At net head of pump = 0
 * 2) Yes