CFESA Steam Practice Test - Questions And Detailed Answers Why will boilers corrode away around the top of the boiler? Right Ans - A result of single metal corrosion from the oxygen sippy being cut off ti thr steel by scale build up How can nickel plated boilers prevent corrosion Right Ans - Nickel is much higher on the galvanic chart Why do you need baking soda or soda ash when deliming boilers? Right Ans - To neutralize the acid used for deliming, and to keep the acid from remaining in pits or scratches inside the boiler shell How often should a boiler be opened and inspected? Right Ans - Depends on the rate of scale build up. But minimum of twice per year.What is the purpose of a sediment filter? Right Ans - Remove granular debris like fine sand and grit A charcoal or carbon filter is used to do what? Right Ans - A charcoal filter is used to remove chlorine, taste and odor from water.When using charcoal filters, why is it so critical that they be changed at regular intervals. Right Ans - Bacteria can begin to grow in the filter after the chlorine is removed.How does a phosphate feeder work? Right Ans - Phosphate produces a thin film on piping, valves, fitting and controls. This film keeps the hard minerals from adhering to their surfaces.Describe the operation of an ion exchange water softener Right Ans - An ion exchange water softener passes water through a resin core that is impregnated with salt as the water passes through the core, the hard water mineral ions are collected in the core and replaced with soft sodium ions. 1 / 2
What are the major disadvantages to reverse osmosis systems? Right Ans - RO systems are very slow to produce pure water and wastes a lot of water flushing the membrane.How much maintenance is required for reverse osmosis systems? Right Ans - A lot of maintenance, including many filter replacements to prevent damage to the membrane.What is the function of an air vent Right Ans - To remove air from the boiler Can a non functional air vent keep a boiler from heating? Right Ans - Yes, if the incoming water pressure compresses the air enough, the high pressure limit control could keep the boiler from heating.What is the difference between a thermostatic steam trap and a thermostatic vent? Right Ans - Nothing.What causes water hammer in a steam line Right Ans - Water hammer results when steam comes in contact with the liquid condensate What are the two primary functions of a steam trap Right Ans - To remove air and condensate How can air in a steam system act as an insulator? Right Ans - Air trapped in a system keeps the steam from having direct contact with the surface and acts as an insulator.What is the purpose of a steam separator Right Ans - To remove excess condensate from the steam supply line when the remote house boilers are located too far away.What is the function of the thermostatic element in a float and thermostatic steam trap? Right Ans - To allow air to pass through the trap.What is the purpose of the float valve in a float and thermostatic trap?Right Ans - To open and allow the condensate to be pushed four of the trap.
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