DC 3rd Class Study Guide Boilers-General Exam with
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
verified detailed answers ||\\//|| ||\\//||
A temperature sensor that measures the resistance of a platinum wire at different
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
temperatures is a __________________________________. - correct answer✔✔Resistive ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Temperature Detector ||\\//||
The percentage of excess air required to burn natural gas, fuel oil or pulverized coal is
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
______________________________. - correct answer✔✔10 to 30% ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
To internally remove oxygen from the boiler, _________________________ is used. -
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
correct answer✔✔Sodium Sulfate ||\\//|| ||\\//||
Water Hammering is caused by quickly opening a ______________________. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Steam Valve ||\\//||
Water Hammering is caused by quickly opening a ______________________. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Gate Valve ||\\//||
Boiler explosions may be caused by an accumulation of
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
_______________________________ igniting spontaneously. - correct ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Unburned Combustibles ||\\//||
For proper combustion air into the boiler room, one square inch of OA opening is required
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
per __________________. - correct answer✔✔400 btu/hr.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Infrared flame scanners use a ______________________ cell to detect flame. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔lead sulfide ||\\//||
,Rectifying phototube and cadmium sulfide phototube both prove flame in the boiler by ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
sensing _____________________________. - correct answer✔✔Visible light ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A _________________ is caused by a slay inclusion forming a lamination at the time the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
plate was rolled. - correct answer✔✔Blister
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
ligament cracks that occur between the __________________________________. - correct ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Tube Holes on the Tube Sheets ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The safety valve capacity must be sufficient to relieve all the steam that the boiler can
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
generate the ______________________________________ without allowing the pressure to ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
rise more then _________% above the MAWP. - correct answer✔✔Maximum Firing Rate;
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
6%
The safety valve on the super heater should always be set at a lower pressure than the
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________________ safety valve to ensure steam flow through the super heater. - correct ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Drum
A three element feedwater regulator senses,
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________________________________________________________. - correct ||\\//|| ||\\//|| ||\\//||
answer✔✔Water level, Water Flow and Steam Flow ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Fuel oil #6 is also called _________________________. - correct answer✔✔Bunker C Oil
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Too much __________ causes dense white smoke. - correct answer✔✔Air
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A slow opening blow down valve must complete ______ turns between a full open and full
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
close. - correct answer✔✔5 ||\\//|| ||\\//|| ||\\//||
, The accumulation of carbon dioxide in the condensate system produces
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
______________________________. - correct answer✔✔Carbonic Acid ||\\//|| ||\\//|| ||\\//|| ||\\//||
The presences of ____________________________ in the flue gas is an indication of
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
incomplete combustion. - correct answer✔✔Carbon Monoxide ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The ________________________________________________ sense heat to prove flame in
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
the boiler. - correct answer✔✔Stack Switch and Rectifying Flame Rod
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Testing coal for moisture, percent volatile, fixed carbon and ash content is
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
____________________________________. - correct answer✔✔Proximate Analysis ||\\//|| ||\\//|| ||\\//|| ||\\//||
Light domestic oil is known as __________________________. - correct answer✔✔#1 fuel
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
oil
The lowest temperature at which fuel oil will flow is the ________________. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔pour point ||\\//||
___________________ is the temperature at which fuel oil will give off a vapor that will ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
ignite when exposed to a flame. - correct answer✔✔Flash Point
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The temperature at which fuel oil will give off vapor that will burn continuously once
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
ignited is the ______________________. - correct answer✔✔Fire Point
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Max adjustment to the set point of a safety valve is ________. - correct answer✔✔10%
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
verified detailed answers ||\\//|| ||\\//||
A temperature sensor that measures the resistance of a platinum wire at different
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
temperatures is a __________________________________. - correct answer✔✔Resistive ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Temperature Detector ||\\//||
The percentage of excess air required to burn natural gas, fuel oil or pulverized coal is
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
______________________________. - correct answer✔✔10 to 30% ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
To internally remove oxygen from the boiler, _________________________ is used. -
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
correct answer✔✔Sodium Sulfate ||\\//|| ||\\//||
Water Hammering is caused by quickly opening a ______________________. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Steam Valve ||\\//||
Water Hammering is caused by quickly opening a ______________________. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Gate Valve ||\\//||
Boiler explosions may be caused by an accumulation of
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
_______________________________ igniting spontaneously. - correct ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Unburned Combustibles ||\\//||
For proper combustion air into the boiler room, one square inch of OA opening is required
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
per __________________. - correct answer✔✔400 btu/hr.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Infrared flame scanners use a ______________________ cell to detect flame. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔lead sulfide ||\\//||
,Rectifying phototube and cadmium sulfide phototube both prove flame in the boiler by ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
sensing _____________________________. - correct answer✔✔Visible light ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A _________________ is caused by a slay inclusion forming a lamination at the time the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
plate was rolled. - correct answer✔✔Blister
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
ligament cracks that occur between the __________________________________. - correct ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Tube Holes on the Tube Sheets ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The safety valve capacity must be sufficient to relieve all the steam that the boiler can
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
generate the ______________________________________ without allowing the pressure to ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
rise more then _________% above the MAWP. - correct answer✔✔Maximum Firing Rate;
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
6%
The safety valve on the super heater should always be set at a lower pressure than the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
________________ safety valve to ensure steam flow through the super heater. - correct ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔Drum
A three element feedwater regulator senses,
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
________________________________________________________. - correct ||\\//|| ||\\//|| ||\\//||
answer✔✔Water level, Water Flow and Steam Flow ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Fuel oil #6 is also called _________________________. - correct answer✔✔Bunker C Oil
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Too much __________ causes dense white smoke. - correct answer✔✔Air
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A slow opening blow down valve must complete ______ turns between a full open and full
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
close. - correct answer✔✔5 ||\\//|| ||\\//|| ||\\//||
, The accumulation of carbon dioxide in the condensate system produces
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
______________________________. - correct answer✔✔Carbonic Acid ||\\//|| ||\\//|| ||\\//|| ||\\//||
The presences of ____________________________ in the flue gas is an indication of
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
incomplete combustion. - correct answer✔✔Carbon Monoxide ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The ________________________________________________ sense heat to prove flame in
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
the boiler. - correct answer✔✔Stack Switch and Rectifying Flame Rod
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Testing coal for moisture, percent volatile, fixed carbon and ash content is
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
____________________________________. - correct answer✔✔Proximate Analysis ||\\//|| ||\\//|| ||\\//|| ||\\//||
Light domestic oil is known as __________________________. - correct answer✔✔#1 fuel
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
oil
The lowest temperature at which fuel oil will flow is the ________________. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔pour point ||\\//||
___________________ is the temperature at which fuel oil will give off a vapor that will ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
ignite when exposed to a flame. - correct answer✔✔Flash Point
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The temperature at which fuel oil will give off vapor that will burn continuously once
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
ignited is the ______________________. - correct answer✔✔Fire Point
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Max adjustment to the set point of a safety valve is ________. - correct answer✔✔10%
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
