Boiler Operation Principles Ch 1 Prediction Test 2024.

Boiler Operation Principles Ch 1 Prediction Test 2024. What is a Boiler? - correct answer A Boiler is a closed metal container (pressure vessel) in which water is heated to produce steam or heated water. Define Steam now... - correct answer Steam is the vapor that forms when water is heated to its boiling point; immediately over 212 F degrees, thus requiring heat over 180 Btu When did steam power have the greatest impact? - correct answer During the Industrial Revolution of the 18th Century and early 19th century. Who developed the first reciprocating steam engine? - correct answer James Whatt of Scotland in 1736. What is a boiler's heating surface? - correct answer Heating surface is the part of the boiler where water is on one side and heat from the gases of combustion on the other. i.e. the bottom of a pot on a burner. How does a boiler's internal surface increase efficiently? - correct answer An internal furnace is a furnace in a boiler that is surrounded by heating surface. This allows fuel to burn more efficiently as it mixes with a greater quantity of air. What is thermal efficiency? - correct answer Thermal efficiency is the ratio of heat absorbed by the water to the heat provided by the fuel. 95% is a common boiler's thermal efficiency What kind of steam becomes condensate? - correct answer Steam that has lost its heat (below 212 F) and returned to water is called Condensate. What is make up water in a boiler? - correct answer Make up water is fresh water introduced to a boiler to make up for the water loss due to leaks or lost condensate. What is feed water composed of? - correct answer Feed water is the combination of make-up water and condensate . This water is treated for use in a boiler. The feedwater pump takes water from condensate receiver tank (surge tank) back to the boiler to repeat cycle. What is a back flow preventer in a boiler? - correct answer A back flow preventer is a device consisting of two check valves and an overflow device built into the same body, used to prevent water from backing up into a water supply system. A backflow preventer is used on the water supply to a building or an individual closed-loop system. If one of the check valves should fail, the water flows to the (floor) drain. What is thermodynamics? - correct answer Thermodynamics is the science of thermal (heat) and how it transforms to and from other forms of energy. Thermodynamics relates to events that occur as heat is generated by the combustion of a fuel and is used to produce steam and hot water in a boiler. 1st and 2nd laws apply to boiler operation.