Stationary Engineer License Practice Grade 4 QUESTIONS WITH COMPLETE 100% VERIFIED SOLUTIO, Exams of Engineering

Download Stationary Engineer License Practice Grade 4 QUESTIONS WITH COMPLETE 100% VERIFIED SOLUTIO and more Exams Engineering in PDF only on Docsity! Stationary Engineer License Practice Grade 4 QUESTIONS WITH COMPLETE 100% VERIFIED SOLUTIONS 2024/2025 what is a boiler a closed metal container (pressure vessel) which water is heated to produce steam or heated water what is steam the vapor that forms when water is heated to its boiling point when did the greatest impact of the use of steam power occur during the industrial revolution 18th and early 19th century who invented the steam engine and when James Watt of Scotland in 1736 How is steam produced water is heated to 212 degrees at atmospheric pressure state the first law of thermodynamics energy cannot be created or destroyed but may be changed from one form to another state the second law of thermodynamics heat always flows from a material at a high temperature to a material at a low temperature what is sensible heat heat that causes a temperature change that can be measured with a thermometer or sensed by a person what is latent heat head identified by a change of state and no temperature change what is a BTU the amount of energy required to raise the temperature of 1 lb of water 1 degree fahrenheit name 3 ways heat is transferred conduction, convection, and radiation How is heat generated in a boiler by the combustion of a fuel name the 3 conditions of combustion perfect, complete. or incomplete name the 3 classifications of combustion air primary air, secondary air, and excess air describe the 4 systems all steam boilers operate using feedwater system, fuel system, draft system, and steam system what does the feedwater system do? supplies the proper amount of water to the boiler what does the draft system regulate? the flow of air to and from the boiler what does the fuel system do provides fuel for combustion to generate the necessary heat in the boiler what does the steam system do? collects, controls, and distributes the steam produced an the boiler what are symbols used for to represent lines, boiler fittings, and accessories on drawings what is MAWP Maximum Allowable Working Pressure. The recommended maximum pressure at which a boiler can be safely operated what is the MAWP of a low pressure boiler not more than 15 psi what is the MAWP of a high pressure boiler more than 15 psi what is a firetube boiler a boiler in which heat and gases of combustion pass through tubes surrounded by water what is a watertube boiler a boiler in which water passes through tubes surrounded by gases of combustion what is a cast iron boiler a boiler that has gases of combustion flowing around cast iron sections that contain water what is an electric boiler a boiler that generates heat by electrical resistance or an electric are what is a condensing boiler a boiler designed to recover some of the heat normally discharged to the atmosphere in the gases of combustion what does a safety valve do prevents the boiler from exceeding its MAWP and is the most important valve on a boiler what is the safety valve capacity the amount of steam in pounds per hour that the safety valve is capable of venting at its rated pressure how often should a try lever test be performed every 30 days the boiler is in operation at what pressure should the try lever test be performed