Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly conditioned will be developed as __________.

Correct Answer: Option D — superheated steam

When live steam passes through a pressure-reducing orifice, the process is isenthalpic. Because the steam expands without performing work, the reduction in pressure results in an increase in enthalpy relative to the new saturation temperature, causing the steam to become superheated at the outlet of the orifice.