4th Class Power Engineering Unit A12 Chapter 4: Feed water Systems Already Passed

4th Class Power Engineering Unit A12 Chapter 4: Feed water Systems Already Passed With this system, not electrical power is required to feed make-up water to the boiler: Select one: a. gravity return system b. pump return system c. low flow return system d. high side return system a These are similar to combined feedwater feeder/cut-offs, with the exception that they do not have integral mechanically operated control valves: Select one: a. float control feeders b. float control switches c. switch control feeders d. switch control floats b Fluid formed when steam is cooled to below its saturation temperature: Select one: a. makeup water b. dew c. feedwater d. condensate d Because deaerators are pressure vessels they require a: Select one: a. check valve b. alarm management system c. automatic drain valve d. pressure relief valve d A sudden vapour cavity formation, growth, and subsequent collapse that occurs in a saturated liquid is known as: Select one: a. vaporization b. cavitation c. fluctuation d. vapour binding b This is identified by the boiler manufacturer, and is the lowest water level at which a boiler can be safety operated: Select one: a. lowest safe working water level b. minimum safe working water level c. lowest permissible water level d. lowest visible water level c Single element feedwater control systems respond only to: Select one: a. drum level b. steam demand c. combustion demand d. swell and shrinkage a When boiler steam flow suddenly decreases,