Identify the following arrangement which is used to determine the velocity at any point in a pipe by a Pitot-tube.
1
Pitot-tube along with a vertical piezometer tube
2
Pitot-static tube, which consists of two circular concentric tubes one side the other with some annular space in between and outlet of these two tubes are connected to the differential manometer
3
Pitot-tube connected with piezometer tube
4
Pitot-tube and vertical piezometer tube connected with a differential U-tube manometer