Answer:
1- venturi
Explanation:
Venturi
In venturi tube the friction is less as compare to the nozzle and the orifice .
Nozzle have a medium friction loss where as orifice have a very high friction loss of , approximately 75 - 80% loss .
Venturi tube have a convergent and a divergent section which helps to reduce the friction loss as compared to the orifice.
The value of the Discharge coefficient in venturimeter is Cd = 0.98 but orifice have discharge coefficient Cd = 0.68 .
