In a twin-tower desiccant type air dryer using silica gel as an adsorbing agent, what is the procedure for rejuvenating the tower presently on service when the desiccant becomes saturated with moisture?

Correct Answer: Option D — The towers are shifted, and heat is applied to the off-going tower.

Under USCG National Maritime Center examination standards, the accepted correct answer is: The towers are shifted, and heat is applied to the off-going tower..