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| Short cycling of the potable water pump is avoided by the proper use of a __________ . |
| A) hydro-pneumatic tank completely filled with compressed airĀ at system operating pressure |
| B) hydro-pneumatic tank filled with water |
| C) charge of air, at 20 psi (137.9 kPa) above system pressureĀ with the hydro-pneumatic tank one quarter full of water |
| D) charge of air, at system pressure, when the hydro-pneumatic tank is half full of water |
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