The basic function of the centrifugal pump impeller is to __________.

Correct Answer: Option B — directly increase the velocity of the liquid being pumped

The centrifugal pump impeller functions by rotating at high speed, which imparts kinetic energy to the fluid by accelerating it radially outward. This increase in velocity is subsequently converted into pressure energy as the fluid passes through the pump volute or diffuser, effectively moving the liquid through the discharge piping.