Stationary Engineer License Practice Grade 4 - Comprehensive Boiler Knowledge, Exams of Engineering

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Stationary Engineer License Practice Grade 4QUESTIONS WITH COMPLETE 100% VERIFIED

SOLUTIONS 2024/

what is a boiler - Correct answer-a closed metal container (pressure vessel) which water is heated toproduce steam or heated water

what is steam - Correct answer-the vapor that forms when water is heated to its boiling point when did the greatest impact of the use of steam power occur - Correct answer-during the industrialrevolution 18th and early 19th century

who invented the steam engine and when - Correct answer-James Watt of Scotland in 1736 How is steam produced - Correct answer-water is heated to 212 degrees at atmospheric pressure state the first law of thermodynamics - Correct answer-energy cannot be created or destroyed but maybe changed from one form to another

state the second law of thermodynamics - Correct answer-heat always flows from a material at a hightemperature to a material at a low temperature

what is sensible heat - Correct answer-heat that causes a temperature change that can be measuredwith a thermometer or sensed by a person

what is latent heat - Correct answer-head identified by a change of state and no temperature change what is a BTU - Correct answer-the amount of energy required to raise the temperature of 1 lb of water1 degree fahrenheit

name 3 ways heat is transferred - Correct answer-conduction, convection, and radiation How is heat generated in a boiler - Correct answer-by the combustion of a fuel name the 3 conditions of combustion - Correct answer-perfect, complete. or incomplete name the 3 classifications of combustion air - Correct answer-primary air, secondary air, and excess air describe the 4 systems all steam boilers operate using - Correct answer-feedwater system, fuel system,draft system, and steam system

what does the feedwater system do? - Correct answer-supplies the proper amount of water to theboiler

what does the draft system regulate? - Correct answer-the flow of air to and from the boiler what does the fuel system do - Correct answer-provides fuel for combustion to generate the necessaryheat in the boiler

what does the steam system do? - Correct answer-collects, controls, and distributes the steam producedan the boiler

at what pressure should the try lever test be performed - Correct answer-a minimum of 5 psi who should make adjustments or repairs to a safety valve - Correct answer-the manufacturer or anauthorized representative of the manufacturer

what is a pop test - Correct answer-test performed to determine if a safety valve opens at the properpressure within allowable tolerances

what does a steam pressure gauge do - Correct answer-displays the amount of pressure in the boiler what is hydrostatic pressure - Correct answer-the weight of water (0.433 psi per vertical foot) what is a siphon - Correct answer-provides a water seal to prevent contact with live steam what is a vacuum gauge - Correct answer-indicates the amount of vacuum (pressure below atmosphericpressure) present in the boiler

who should make repairs to a pressure gauge - Correct answer-manufacturer or authorizedrepresentative of the manufacturer

why should you never add water to a boiler if there is no water in a gauge glass - Correct answer-addingwater to a boiler with a low water condition could cause a boiler explosion

what is the purpose of a water column - Correct answer-a water column reduces the turbulence ofboiler water to provide an accurate water level in the gauge glass

what does a gauge glass indicate - Correct answer-water level in the boiler what are try cocks used for - Correct answer-to determine the boiler water level if the gauge glass is notfunctiona

how is sludge and sediment removed from the gauge glass and water column - Correct answer-blowdown

what are bottom blowdown valves used for - Correct answer-to release water from the bottom of theboiler

describe the bottom blowdown valve order - Correct answer-the valve closest to the boiler is alwaysopened first and closed last

what is the purpose of the bottom blowdown - Correct answer-water level control, sludge and sedimentremoval, and dumping the boiler

name 3 components that prevent damage to the sewer system - Correct answer-a blowdown tank,blowdown separator, and heat exchanger

when should a boiler never be dumped - Correct answer-when hot what is a fusible plug - Correct answer-a warning device used to indicate extreme overheating of theboiler from a low water condition

where is the fusible plug usually located on a Scotch Marine Boiler - Correct answer-in the top of thecombustion chamber or in the rear tube sheet above the highest row of tubes

how often should fusible plugs be replaced - Correct answer-annually during boiler inspection what size is the boiler vent line - Correct answer-half inch or three quarter inch piping where should the boiler vent line connect - Correct answer-to the highest part of the steam side of theboiler

what should a safety valve never be used for - Correct answer-venting a boiler