Question

Name the type of impeller used for agitation of low viscosity fluids, on high speeds?

(a) Propeller

(b) Concave Blade Impeller

(c) Straight blade turbine

(d) Paddles

This question was addressed to me in an online interview.

My question is from Power for Agitation in division Agitation and Mixing of Liquids of Food Processing Unit Operations

Answer 1

The correct option is (a) Propeller

Explanation: Propellers are a type of impellers used for agitation of low viscosity fluids, on high speeds. They are effective in large vessels due to their persistence of flow currents. Paddles are used in slow or moderately sped vessels, whereas turbines are used over a wide range of viscosities.