16. A steam trap works automatically and is put into drain lines so that these drain offcondensate automatically without passing any steam. One type of operated traps utilizes floatcontrolledneedle valves to trap steam or air. Some use open floats, other ball type floats. Whattype of operated traps is above description?
(A) Thermostatic trap
(B) Mechanical trap
(C) Thermodynamic trap
(D) Vacuum trap