A. Raschig rings
B. Raschig rings
C. Cross-partition rings
D. All give the same value
A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
B. 4 : 1 to 8 : 1 for liquid-liquid exchanger
C. < 4 : 1 for gas-gas exchangers
D. Both B. & C.
A. Allowable gas velocity through the slots
B. Plate spacing
C. Diameter of the column
D. All A., B. and C.
A. 4 A/P
B. A/P
C. 4 P/A
D. √A
A. Higher
B. Lower
C. Same
D. Unpredictable
A. Is economical in operation
B. Employs high velocity, high heat transfer rate and less heating surface requirement
C. Employs a centrifugal pump placed between external downtake from vapor drum and inlet to
tube bundle
D. Both B. & C.
A. Downcomer liquid seal
B. Static submergence
C. Skirt clearance
D. None of these