5. The power required by an impeller in a gas sparged system compare to the power required by impeller operating at same speed in a gas free liquid is usually
Options
A. lesser
B. higher
C. same
D. may be lesser or higher depending upon the geometry
Correct Answer: the saturation concentration of oxygen is higher
9. A cylindrical reactor fitted with Rushton Turbine has a liquid volume of 100,000 litres. It has an aspect ratio (the ratio of the channel height to the width) of 2:1. The diameter of the impeller should be approximately: