According to the illustration, which of the following conditions would most likely cause pump "A" to short cycle? GS-0173

Correct Answer: Option A — The hydro-pneumatic expansion tank is operating with an insufficient air charge.

Short cycling in a hydro-pneumatic system occurs when the pressure tank loses its air cushion. Without sufficient air to act as a buffer, the pressure drops rapidly as water is drawn, causing the pump to start and stop frequently, which increases wear on the motor and electrical starting components.