Discussion
Capacity of hydraulic accumulator is given as:
Answer: B
The capacity is pressure of water supplied by pump × volume of accumulator.
An accumulator stores energy by lifting a loaded ram. The energy stored is the pressure times the ram area times the stroke, and area times stroke is the accumulator's volume.
\[ \text{capacity} = p \times A \times L = p \times V \]
Pressure times area alone is a force, not energy, and pressure times stroke has the wrong units. Dividing by area makes no physical sense.
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