If valve "H" shown in the illustration is opened wide while the distiller is in operation, __________. Illustration MO-0111

Correct Answer: Option D — the absolute pressure of the unit will increase with an associated increase in shell temperature

Opening valve H introduces air or non-condensable gases into the vacuum space. This increases the absolute pressure within the shell. According to the pressure-temperature relationship of saturated steam, an increase in shell pressure results in a corresponding increase in the boiling point and shell temperature.