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”)

3. 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”)
o three fourth
o equal to
o 1.5 times
o half

Ans: B