DC 3rd Class Study Guide Boilers-
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General questions with answers |\ |\ |\
A temperature sensor that measures the resistance of a
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platinum wire at different temperatures is a
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__________________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔Resistive Temperature Detector |\ |\
The percentage of excess air required to burn natural gas,
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fuel oil or pulverized coal is
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______________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔10 to 30% |\ |\
To internally remove oxygen from the boiler,
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_________________________ is used. - CORRECT ANSWERS |\ |\ |\ |\ |\ |\
✔✔Sodium Sulfate |\
Water Hammering is caused by quickly opening a
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______________________. - CORRECT ANSWERS ✔✔Steam |\ |\ |\ |\ |\
Valve
Water Hammering is caused by quickly opening a
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______________________. - CORRECT ANSWERS ✔✔Gate |\ |\ |\ |\ |\
Valve
,Boiler explosions may be caused by an accumulation of
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_______________________________ igniting spontaneously. - |\ |\ |\ |\
CORRECT ANSWERS ✔✔Unburned Combustibles |\ |\ |\
For proper combustion air into the boiler room, one
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square inch of OA opening is required per
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__________________. - CORRECT ANSWERS ✔✔400 btu/hr. |\ |\ |\ |\ |\
Infrared flame scanners use a ______________________ cell
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to detect flame. - CORRECT ANSWERS ✔✔lead sulfide
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Rectifying phototube and cadmium sulfide phototube
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both prove flame in the boiler by sensing
|\ |\ |\ |\ |\ |\ |\ |\
_____________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔Visible light |\
A _________________ is caused by a slay inclusion forming a
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lamination at the time the plate was rolled. - CORRECT
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ANSWERS ✔✔Blister |\
ligament cracks that occur between the |\ |\ |\ |\ |\ |\
__________________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔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
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MAWP. - CORRECT ANSWERS ✔✔Maximum Firing Rate; 6%
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The safety valve on the super heater should always be
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set at a lower pressure than the ________________ safety
|\ |\ |\ |\ |\ |\ |\ |\ |\
valve to ensure steam flow through the super heater. -
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CORRECT ANSWERS ✔✔Drum |\ |\
A three element feedwater regulator senses,
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________________________________________________________. - |\
CORRECT ANSWERS ✔✔Water level, Water Flow and
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Steam Flow |\
Fuel oil #6 is also called _________________________. -
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CORRECT ANSWERS ✔✔Bunker C Oil |\ |\ |\ |\
Too much __________ causes dense white smoke. -
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CORRECT ANSWERS ✔✔Air |\ |\
A slow opening blow down valve must complete ______
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turns between a full open and full close. - CORRECT
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ANSWERS ✔✔5 |\
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General questions with answers |\ |\ |\
A temperature sensor that measures the resistance of a
|\ |\ |\ |\ |\ |\ |\ |\ |\
platinum wire at different temperatures is a
|\ |\ |\ |\ |\ |\ |\
__________________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔Resistive Temperature Detector |\ |\
The percentage of excess air required to burn natural gas,
|\ |\ |\ |\ |\ |\ |\ |\ |\
fuel oil or pulverized coal is
|\ |\ |\ |\ |\ |\ |\
______________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔10 to 30% |\ |\
To internally remove oxygen from the boiler,
|\ |\ |\ |\ |\ |\ |\
_________________________ is used. - CORRECT ANSWERS |\ |\ |\ |\ |\ |\
✔✔Sodium Sulfate |\
Water Hammering is caused by quickly opening a
|\ |\ |\ |\ |\ |\ |\ |\
______________________. - CORRECT ANSWERS ✔✔Steam |\ |\ |\ |\ |\
Valve
Water Hammering is caused by quickly opening a
|\ |\ |\ |\ |\ |\ |\ |\
______________________. - CORRECT ANSWERS ✔✔Gate |\ |\ |\ |\ |\
Valve
,Boiler explosions may be caused by an accumulation of
|\ |\ |\ |\ |\ |\ |\ |\ |\
_______________________________ igniting spontaneously. - |\ |\ |\ |\
CORRECT ANSWERS ✔✔Unburned Combustibles |\ |\ |\
For proper combustion air into the boiler room, one
|\ |\ |\ |\ |\ |\ |\ |\ |\
square inch of OA opening is required per
|\ |\ |\ |\ |\ |\ |\ |\
__________________. - CORRECT ANSWERS ✔✔400 btu/hr. |\ |\ |\ |\ |\
Infrared flame scanners use a ______________________ cell
|\ |\ |\ |\ |\ |\ |\
to detect flame. - CORRECT ANSWERS ✔✔lead sulfide
|\ |\ |\ |\ |\ |\ |\
Rectifying phototube and cadmium sulfide phototube
|\ |\ |\ |\ |\ |\
both prove flame in the boiler by sensing
|\ |\ |\ |\ |\ |\ |\ |\
_____________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔Visible light |\
A _________________ is caused by a slay inclusion forming a
|\ |\ |\ |\ |\ |\ |\ |\ |\
lamination at the time the plate was rolled. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Blister |\
ligament cracks that occur between the |\ |\ |\ |\ |\ |\
__________________________________. - CORRECT ANSWERS |\ |\ |\ |\
✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔Drum |\ |\
A three element feedwater regulator senses,
|\ |\ |\ |\ |\ |\
________________________________________________________. - |\
CORRECT ANSWERS ✔✔Water level, Water Flow and
|\ |\ |\ |\ |\ |\ |\ |\
Steam Flow |\
Fuel oil #6 is also called _________________________. -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Bunker C Oil |\ |\ |\ |\
Too much __________ causes dense white smoke. -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Air |\ |\
A slow opening blow down valve must complete ______
|\ |\ |\ |\ |\ |\ |\ |\ |\
turns between a full open and full close. - CORRECT
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ANSWERS ✔✔5 |\
