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Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8"). | |
A. | half [Wrong Answer] |
B. | three fourth [Wrong Answer] |
C. | equal to [Correct Answer] |
D. | 1.5 times [Wrong Answer] |