Which statement best describes the function of the accumulator in the described setup?

• A. It increases the pump's electrical power.
• B. It cools the hydraulic fluid to prevent overheating.
• C. It provides an additional supply of hydraulic oil to the cylinder, enabling faster movement.
• D. It replaces the pump during operation.

Answer: (C)

The function being tested is that an accumulator stores hydraulic energy and can release extra oil to the cylinder when needed. It uses a gas-filled chamber to pressurize a portion of hydraulic fluid, so when the cylinder requires a quick stroke or when pump flow is temporarily insufficient, the accumulator dumps its stored fluid into the circuit. This provides an additional supply to the cylinder, enabling faster movement and smoother operation, without putting more load on the pump. It also helps dampen pressure fluctuations. It does not increase electrical power, cool the fluid, or replace the pump during operation.