In a vertical short tube evaporator (Calandria type), the ______________________?
(A) Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical drum dia of 1-6 metres are normally used
(B) Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
(C) Liquor is inside the tube while the steam is outside the tube
(D) All
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