An automatic solenoid dump valve should be set to trip if the evaporator produces distillate with salt content exceeding __________.

Correct Answer: Option A — .25 gpg

USCG and marine engineering standards typically set the automatic dump valve threshold at 0.25 grains per gallon (gpg) to ensure the purity of the ship's potable water. If salinity exceeds this limit, the solenoid valve diverts the distillate to the bilge or evaporator feed to prevent tank contamination.