vi. By increasing flow rate, the volumetric efficiency of a piston pump vii. A manometer is a device for measuring. viii. The dependence of pressure drop in a pipe on the length of the pipe is than on the diameter of the pipe. ix. In digital joule meter experiment, at constant voltage, as the mass lifted by the motor increases, the efficiency of the motor x. In fan experiment the suction pressure is 1 ess then the atmospheric pressure