11. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.
12. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
13. Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?
14. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m2.°C.
15. $$\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}$$ for a Tee (used as elbow, entering branch) would be
16. Bubble cap plate column is
17. In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.
18. The thermal stress in a metallic bar does not depend upon the
19. Maximum allowable vapour velocity in a bubble cap tower is determined by the
20. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
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