Which type of pump is described as having an impeller fixed on a rotating shaft enclosed in a casing with an inlet and a discharge, where the impeller creates pressure by centrifugal force?

Which type of pump is described as having an impeller fixed on a rotating shaft enclosed in a casing with an inlet and a discharge, where the impeller creates pressure by centrifugal force?

• A. Diaphragm
• B. Jet
• C. Gear
• D. Centrifugal

Answer: (D)

This question focuses on how a centrifugal pump operates. The key idea is that energy is added to the fluid by an impeller fixed on a rotating shaft inside a casing with an inlet and a discharge. As the impeller spins, it throws the fluid outward due to centrifugal force, increasing its velocity. The casing then converts that higher velocity into increased pressure, producing flow out of the discharge. This converting of kinetic energy from the spinning impeller into pressure is the hallmark of a centrifugal pump. Think of other pump types to see why this fits: a diaphragm pump uses a flexible membrane to displace fluid, not relying on centrifugal energy; a jet pump uses a high-velocity jet and venturi effects rather than an impeller-driven mechanism; a gear pump traps fixed volumes between meshing gears to move fluid, generating pressure by displacement rather than centrifugal acceleration.

This question focuses on how a centrifugal pump operates. The key idea is that energy is added to the fluid by an impeller fixed on a rotating shaft inside a casing with an inlet and a discharge. As the impeller spins, it throws the fluid outward due to centrifugal force, increasing its velocity. The casing then converts that higher velocity into increased pressure, producing flow out of the discharge. This converting of kinetic energy from the spinning impeller into pressure is the hallmark of a centrifugal pump.

Think of other pump types to see why this fits: a diaphragm pump uses a flexible membrane to displace fluid, not relying on centrifugal energy; a jet pump uses a high-velocity jet and venturi effects rather than an impeller-driven mechanism; a gear pump traps fixed volumes between meshing gears to move fluid, generating pressure by displacement rather than centrifugal acceleration.