Q1-a) Answer by True (T) or False (F) on the following questions: [Marks: 1.5x4=6] i) All of the developed countries have national standards organizations, responsible for the issue and maintenance of standards for the manufacturing industries. ii) NPSHavailale must be lower than NPSHeqquired to prevent cavitation. iii) Increase reflux ratio decreases column diameter and reducing number of trays. iv) Thin-walled pressure vessels when the ratio of wall thickness to vessel diameter greater than (1/10)