Film boiling is usually not desired in commercial equipments, because

1.	Film boiling is usually not desired in commercial equipments, because
A.	the heat transfer rate is low in view of the large temperature drop.
B.	it is difficult to maintain.
C.	it is not economic.
D.	none of these.
Answer» B. it is difficult to maintain.

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Film boiling is usually not desired in commercial equipments, because

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