Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs?

A. Maximum permissible vapour velocity
B. Flooding limit of the column
C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
D. None of these

A. Tall (say 30 metres), but is full of liquid
B. Tall but empty
C. Short (< 2 m) and housed indoor
D. None of these

A. Filtering area & the pressure difference driving force
B. Viscosity of filtrate
C. Cake & filter medium resistance
D. Both A. and B.

A. nth
B. (1/n)th
C. 0.5 nth
D. 1.5 nth

A. Type & size of packing
B. Fluid rates and fluid properties
C. Operating pressure and column diameter
D. All A., B. and C.

A. < 10
B. > 10
C. > 20
D. 30