Conventionally,
in a Babcock-Wilcoxboiler, the circulationofwaterbetweenthedrumandthe
water-tubes is :
there is no
circulation of water
caused by gravity
normally by natural circulation (thermosyphon)
by a pump
normally by natural circulation (thermosyphon)
In
Babcock-Wilcox boiler, a continuous circulation of water from drum to the water
tubes and water tubes to the drum is maintained by connective currents and is
known as natural circulation.
Hence, the
correct option is (C).
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