Absa 5th Class Study Guide Graded A+

In both "shell and coil type" and "shell and tube type" condensers: {Ans: Cooling efficiency is high.}During the regeneration of a sodium zeolite softener, what happens to the elemental impuritites that are attached to the zeolite? {Ans: They are exchanged for sodium}Ethane is a component of natural gas and constitutes a percent volume of: {Ans: 10-20%}Feedwater system filters are used: {Ans: for external water treatment}This type of system uses water obtained from a private supply at about 420 kPa. This system is generally used on low-rise buildings. {Ans: direct pressure system}Which of the following is considered to be the refrigerant for the long term? A) HCFC's B) HFC's C) CFC's {Ans: B}