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Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column. | |
A. | Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates. [Wrong Answer] |
B. | Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap. [Wrong Answer] |
C. | Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features. [Correct Answer] |
D. | Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range. [Wrong Answer] |