What statement is true concerning the operation of a distilling plant or boiler feed water salinometer?

Correct Answer: Option D — The greater the salt content of water, the greater the conductivity of the water, and temperature correction is necessary because conductivity increases with a rise in temperature.

Salinometers measure the electrical conductivity of water, which increases with higher concentrations of dissolved salts. Because conductivity is also temperature-dependent, increasing with temperature, automatic temperature compensation is required to ensure the salinity reading remains accurate regardless of fluctuations in the temperature of the sampled boiler feed water.