Which statement about a pump is true?

• A. It seals fluids by rotating a ball to close a passage.
• B. It dampens hydraulic pulses.
• C. It secures pipes.
• D. It raises, transfers, or pressurizes fluids by forcing them through passages.

Answer: (D)

A pump’s job is to move and pressurize fluids by converting mechanical energy into hydraulic energy, raising the fluid’s pressure and forcing it through passages in the system. This is exactly what the statement describes—raising, transferring, or pressurizing fluids by pushing them through conduits. The other descriptions refer to different components: a rotating ball closing a passage is a valve function that controls flow, a device that dampens hydraulic pulses manages pressure fluctuations, and something that secures pipes is a support or fastener.