The following test data were gathered to design a settling tank. The initial turbidity for the test was 33.0 NTU.
Determine the detention time and overflow rate that will yield 88% removal of suspended solids. The data given are suspended solids concentrations in NTU.

Time, min
Depth,ᵃ m 30 60 90 120
1.0 5.6 2.0
2.0 11.2 5.9 2.6
3.5 14.5 9.9 6.6 3.0
"Depths from top of column, colunul depth =4.0 m.

An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?