Operating
pressure for once through boiler is :
Subcritical
and critical
Critical
Subcritical
Super-critical
Super-critical
Once through
boiler are generally associated with high pressure operation and the feed water
enter at high subcritical (>180 bar) or supercritical pressure while
superheated steam leaves at a pressure about 20– 30 bar lower.
Hence, the
correct option is (D).
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