A venturimeter is to be fitted in a pipe of 20 cm diameter where pressure head is 7.6 m of flowing fluid and the maximum flow
is 8100 lt/min. Find the least diameter of the throat to ensure that pressure head does not become negative. Presume discharge coefficient for the venturinmeter is 0.96. What is the quantity of liquid flowing through it when a differential manometer shows a steady deflection of 20 cm of mercury ?