a) Propeller
b) Concave Blade Impeller
c) Straight blade turbine
d) Paddles
Answer: a
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.
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