Question

The type of centrifugal pump preferred for specific speed of 20 r.p.m. is
(A) slow speed pump with radial flow at outlet
(B) medium speed pump with radial flow at outlet
(C) high speed pump with radial flow at outlet
(D) high speed pump with axial flow at outlet

Answer 1

Hint The low-speed radial flow impellers develop a hydraulic head through the principle of centrifugal force. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is a pump that has a speed which is slow with an outlet which is radial.

Complete step by step answer:
Centrifugal pumps are those which are used for the conversion of the rotational kinetic energy to the hydrodynamic energy of the liquid flow. This rotational kinetic energy of the centrifugal pump comes from an engine or an electric motor. The liquid enters the pump near the rotating axis. It is then accelerated by the impeller, which is the rotor that increases the pressure or the flow of the liquid, which then flows radially into the diffuser, from where it exits.
Therefore the outlet of a centrifugal pump has a radial flow.
And for a specific speed of 20 r.p.m., we need to use a pump that has a slow speed.
So the correct answer to this question is a slow speed pump with radial flow at the outlet.

Hence, the correct option will be A.

Additional Information The water turbine is the reverse of a centrifugal pump. It converts the potential energy of the water into the rotational kinetic energy.

Note: The centrifugal pumps have a huge variety of uses. A few very common uses being in the water, sewage, agriculture, petroleum or petrochemical pumping. The centrifugal pumps are chosen for so many places mainly because of their simple engineering and high flow rate capabilities. They can also handle huge quantities of fluid and adjust their flow rates over a wide range.