(a) A venturi-meter of 150 mm (inlet diameter), 75 mm (throat diameter) size is used to measure the flow rate of oil having specific gravity of 0.9. The reading shown by the L tube manometer connected to the venturi-meter is 150 mm of mercury column. Calculate the coefficient of discharge for the venturi-meter if the flow rate is 1.7 m/min. (Note that: Mercury density equal to 13600 kg/m). (5 Marks)