The average fractional gas hold up (H) can be given as (where Zf and – McqOptions

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1.	The average fractional gas hold up (H) can be given as (where Zf and Zl are the level of aerated and clear liquid respectively)
A.	H = (Zf-Zl)/Zf
B.	H = Zf/Zl
C.	H = Zf/ZfZl
D.	H =(Zf+Zl)/Zf
Answer» B. H = Zf/Zl

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