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Grade 4 Stationary Engineer License Practice
Grade 4 Stationary Engineer License Practice
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Grade 4 Stationary Engineer LicensePractice
at what pressure should the try lever test be performed - ANS-a minimum of 5 psi
describe the 4 systems all steam boilers operate using - ANS-feedwater system, fuel
system, draft system, and steam system
describe the bottom blowdown valve order - ANS-the valve closest to the boiler is
always opened first and closed last
How is heat generated in a boiler - ANS-by the combustion of a fuel
how is sludge and sediment removed from the gauge glass and water column -
ANS-blowdown
How is steam produced - ANS-water is heated to 212 degrees at atmospheric pressure
how often should a try lever test be performed - ANS-every 30 days the boiler is in
operation
how often should fusible plugs be replaced - ANS-annually during boiler inspection
in what state should the burner be started and shut down - ANS-low fire
name 3 components that prevent damage to the sewer system - ANS-a blowdown tank,
blowdown separator, and heat exchanger
name 3 ways heat is transferred - ANS-conduction, convection, and radiation
name the 3 classifications of combustion air - ANS-primary air, secondary air, and
excess air
name the 3 conditions of combustion - ANS-perfect, complete. or incomplete
name two types of heat exchanger protection from overpressure - ANS-thermal
expansion safety relief valve or rupture disc
, state 3 things that a pressure control does - ANS-a pressure control is a switch that
starts the burner, controls the firing rate, or shuts down the burner based on steam
pressure
state the first law of thermodynamics - ANS-energy cannot be created or destroyed but
may be changed from one form to another
state the second law of thermodynamics - ANS-heat always flows from a material at a
high temperature to a material at a low temperature
what are bottom blowdown valves used for - ANS-to release water from the bottom of
the boiler
what are symbols used for - ANS-to represent lines, boiler fittings, and accessories on
drawings
what are try cocks used for - ANS-to determine the boiler water level if the gauge glass
is not functiona
what does a gauge glass indicate - ANS-water level in the boiler
what does a safety valve do - ANS-prevents the boiler from exceeding its MAWP and is
the most important valve on a boiler
what does a steam pressure gauge do - ANS-displays the amount of pressure in the
boiler
what does the draft system regulate? - ANS-the flow of air to and from the boiler
what does the feedwater system do? - ANS-supplies the proper amount of water to the
boiler
what does the fuel system do - ANS-provides fuel for combustion to generate the
necessary heat in the boiler
what does the modulating control do - ANS-controls the firing rate of the burner
what does the operating control do - ANS-initiates the burner start up sequence and
burner shutdown sequence as required
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