When two identical centrifugal pumps are operating in series on a common rising main then:
1
the discharge will be nearly doubled, while the pressure remains the same
2
the pressure in the rising main will be nearly doubled, while discharge will remain the same
3
the discharge as well as the pressure in the rising main will be doubled
4
the discharge as well as the pressure in the rising main will increase but not become double
5
none of the above