Which component is included in hydraulic system C but not in hydraulic system B?

• A. Accumulator
• B. Filter
• C. Double Action Actuator
• D. Selector Valve

Answer: (A)

The key idea is that an accumulator acts as an energy storage device in a hydraulic system, holding pressurized fluid so the system can deliver a surge of flow or maintain pressure when demand changes or the pump isn’t supplying fluid instantly.

In hydraulic system C, an accumulator is included to provide this stored energy. It smooths out pressure fluctuations, supports peak flow demands, and can supply fluid if the pump momentarily drops or stops, helping to keep actuators moving smoothly and preventing pressure drops. Hydraulic system B, on the other hand, is designed without this energy storage capability, so it doesn’t include an accumulator; it relies on the pump output and immediate flow paths without stored fluid for bursts.

Other components—like a filter, a double-acting actuator, and a selector valve—are common in many hydraulic configurations and are not the distinguishing feature between these two systems. The filter keeps fluid clean, the double-acting actuator provides bidirectional motion, and the selector valve directs flow as needed.