DC BOILER EXAM PREP 2024 UPDATE WITH
SOLVED SOLUTIONS 100% CORRECT
_____ keeps the hardness in boiler water in solution so that it cannot settle out
on the heating surfaces. - ✔✔✔ ANSWER Chelants
______ cause hardness particles in boiler water to precipitate as heavy sludge
that is removed through the bottom blow. - ✔✔✔ ANSWER Phosphates
_______ in boiler water contributes to the formation of CO2. - ✔✔✔ ANSWER
High Alkalinity
#2 fuel oil contains approximately ______ Btu/gal - ✔✔✔ ANSWER 141,000
#6 fuel oil contains approximately _____ Btu/gal - ✔✔✔ ANSWER 155,000
% of oxygen in air - ✔✔✔ ANSWER 21%
1 BHP = x ft² of heating surface (general) - ✔✔✔ ANSWER 10 ft² heating surface
1 Boiler Horsepower = x Btu/hr - ✔✔✔ ANSWER 33,475 Btu/hr
1 Boiler Horsepower = x lbs of steam generator per hour - ✔✔✔ ANSWER 34.5
lbs/hr
1 lb of chemical to 1000 gallons of water = x ppm - ✔✔✔ ANSWER 120 ppm
A ____ amine is injected into a boiler during operation to raise the pH of the
condensate. - ✔✔✔ ANSWER Neutralizing
A _____ test is a test that determines the concentration of a specific dissolved
substance. - ✔✔✔ ANSWER Titration
A 10°F rise in feed water temperature results in a ____ increase in efficiency -
✔✔✔ ANSWER 1%
A dearator stores how much feedwater? - ✔✔✔ ANSWER 20-30 minutes supply
A demineralizer is usually used with ____ pressure boilers - ✔✔✔ ANSWER High
A flash tank____ - ✔✔✔ ANSWER Recovers low pressure steam
,A reciprocating pump is a ___ type pump. - ✔✔✔ ANSWER positive displacement
A saybolt viscometer is used for _____. - ✔✔✔ ANSWER testing and grading of
oils
A single element feedwater heater responds to ____ - ✔✔✔ ANSWER water level
A steam pressure gauge can be calibrated with a _____. - ✔✔✔ ANSWER
deadweight tester
A steam pressure gauge should have a range at least _____. - ✔✔✔ ANSWER 1-
1/2 times the safety valve setting
A sudden increase in stack temperature without a corresponding increase n steam
demand indicates what? - ✔✔✔ ANSWER a broken baffle
A three element feedwater heater responds to ____ - ✔✔✔ ANSWER water level,
steam flow, & feedwater flow
A two element feedwater heater responds to ____ - ✔✔✔ ANSWER water level &
steam flow
A(n) _____ analysis is used to determine the percentage of various elements
contained in coal, including carbon, oxygen, nitrogen, hydrogen, sulphur, and ash.
- ✔✔✔ ANSWER ultimate
A(n) _____ test is performed on a boiler to check the operation of the low water
fuel cutoff by allowing the water level in the boiler to drop slowly. - ✔✔✔
ANSWER Evaporation
Above ____°F & ______ psi a hot water boiler is considered "high pressure" -
✔✔✔ ANSWER 250°F & 160 psi
According to ASME Code how often should a boiler be blown down when no
boiler water analysis is done? - ✔✔✔ ANSWER every 24 hours
According to ASME Code, a boiler pressure gauge should have a range of - ✔✔✔
ANSWER 1-1/2 - 2 times the safety valve setting
According to ASME code, the maximum size of the boiler bottom blowdown line is
_____. - ✔✔✔ ANSWER 2-1/2"
, According to ASME Code, what must a boiler with more than 500 ft² of heating
surface have? - ✔✔✔ ANSWER two or more safety valves
According to ASME Code, when warming up a boiler during cold plant startup, the
boiler vent should remain open until the steam pressure reaches approximately
____ psi. - ✔✔✔ ANSWER 25 psi
ACR tubing is sized by - ✔✔✔ ANSWER Outside diameter
After replacing the gauge glass but before placing it in service, it is necessary to
_____. - ✔✔✔ ANSWER crack open the steam valve and warm the glass
Air is approximately ___% oxygen and ___ % nitrogen - ✔✔✔ ANSWER 21, 79
An anion is an atom with a ____ electrical charge? - ✔✔✔ ANSWER negative
An economizer is used to heat? - ✔✔✔ ANSWER feedwater
An evaporation test should be performed _____ to check the low water fuel cut
off control. - ✔✔✔ ANSWER Monthly
Anthracite coal has a ________ content. - ✔✔✔ ANSWER High fixed carbon
Area Covered by Staybolt - ✔✔✔ ANSWER = Pitch x Pitch
Area of a Circle - ✔✔✔ ANSWER .7854 x Diameter²
Area of a rectangle - ✔✔✔ ANSWER Length x Width
As water is heated, the solubility of oxygen_____. - ✔✔✔ ANSWER decreases
Atmospheric pressure in in.Hg. - ✔✔✔ ANSWER 29.29 in.HG
Atmospheric pressure in psi - ✔✔✔ ANSWER 14.7 psi
Boiler CO2 readings of 12.5% over fire, 11.5% in the second pass, and 8% at the
damper indicate____? - ✔✔✔ ANSWER leaks through the boiler side wall
Boiler Heating Surface (tubes) = - ✔✔✔ ANSWER = C x L x #
C = Circumference of tubes
L = Length of tubes
SOLVED SOLUTIONS 100% CORRECT
_____ keeps the hardness in boiler water in solution so that it cannot settle out
on the heating surfaces. - ✔✔✔ ANSWER Chelants
______ cause hardness particles in boiler water to precipitate as heavy sludge
that is removed through the bottom blow. - ✔✔✔ ANSWER Phosphates
_______ in boiler water contributes to the formation of CO2. - ✔✔✔ ANSWER
High Alkalinity
#2 fuel oil contains approximately ______ Btu/gal - ✔✔✔ ANSWER 141,000
#6 fuel oil contains approximately _____ Btu/gal - ✔✔✔ ANSWER 155,000
% of oxygen in air - ✔✔✔ ANSWER 21%
1 BHP = x ft² of heating surface (general) - ✔✔✔ ANSWER 10 ft² heating surface
1 Boiler Horsepower = x Btu/hr - ✔✔✔ ANSWER 33,475 Btu/hr
1 Boiler Horsepower = x lbs of steam generator per hour - ✔✔✔ ANSWER 34.5
lbs/hr
1 lb of chemical to 1000 gallons of water = x ppm - ✔✔✔ ANSWER 120 ppm
A ____ amine is injected into a boiler during operation to raise the pH of the
condensate. - ✔✔✔ ANSWER Neutralizing
A _____ test is a test that determines the concentration of a specific dissolved
substance. - ✔✔✔ ANSWER Titration
A 10°F rise in feed water temperature results in a ____ increase in efficiency -
✔✔✔ ANSWER 1%
A dearator stores how much feedwater? - ✔✔✔ ANSWER 20-30 minutes supply
A demineralizer is usually used with ____ pressure boilers - ✔✔✔ ANSWER High
A flash tank____ - ✔✔✔ ANSWER Recovers low pressure steam
,A reciprocating pump is a ___ type pump. - ✔✔✔ ANSWER positive displacement
A saybolt viscometer is used for _____. - ✔✔✔ ANSWER testing and grading of
oils
A single element feedwater heater responds to ____ - ✔✔✔ ANSWER water level
A steam pressure gauge can be calibrated with a _____. - ✔✔✔ ANSWER
deadweight tester
A steam pressure gauge should have a range at least _____. - ✔✔✔ ANSWER 1-
1/2 times the safety valve setting
A sudden increase in stack temperature without a corresponding increase n steam
demand indicates what? - ✔✔✔ ANSWER a broken baffle
A three element feedwater heater responds to ____ - ✔✔✔ ANSWER water level,
steam flow, & feedwater flow
A two element feedwater heater responds to ____ - ✔✔✔ ANSWER water level &
steam flow
A(n) _____ analysis is used to determine the percentage of various elements
contained in coal, including carbon, oxygen, nitrogen, hydrogen, sulphur, and ash.
- ✔✔✔ ANSWER ultimate
A(n) _____ test is performed on a boiler to check the operation of the low water
fuel cutoff by allowing the water level in the boiler to drop slowly. - ✔✔✔
ANSWER Evaporation
Above ____°F & ______ psi a hot water boiler is considered "high pressure" -
✔✔✔ ANSWER 250°F & 160 psi
According to ASME Code how often should a boiler be blown down when no
boiler water analysis is done? - ✔✔✔ ANSWER every 24 hours
According to ASME Code, a boiler pressure gauge should have a range of - ✔✔✔
ANSWER 1-1/2 - 2 times the safety valve setting
According to ASME code, the maximum size of the boiler bottom blowdown line is
_____. - ✔✔✔ ANSWER 2-1/2"
, According to ASME Code, what must a boiler with more than 500 ft² of heating
surface have? - ✔✔✔ ANSWER two or more safety valves
According to ASME Code, when warming up a boiler during cold plant startup, the
boiler vent should remain open until the steam pressure reaches approximately
____ psi. - ✔✔✔ ANSWER 25 psi
ACR tubing is sized by - ✔✔✔ ANSWER Outside diameter
After replacing the gauge glass but before placing it in service, it is necessary to
_____. - ✔✔✔ ANSWER crack open the steam valve and warm the glass
Air is approximately ___% oxygen and ___ % nitrogen - ✔✔✔ ANSWER 21, 79
An anion is an atom with a ____ electrical charge? - ✔✔✔ ANSWER negative
An economizer is used to heat? - ✔✔✔ ANSWER feedwater
An evaporation test should be performed _____ to check the low water fuel cut
off control. - ✔✔✔ ANSWER Monthly
Anthracite coal has a ________ content. - ✔✔✔ ANSWER High fixed carbon
Area Covered by Staybolt - ✔✔✔ ANSWER = Pitch x Pitch
Area of a Circle - ✔✔✔ ANSWER .7854 x Diameter²
Area of a rectangle - ✔✔✔ ANSWER Length x Width
As water is heated, the solubility of oxygen_____. - ✔✔✔ ANSWER decreases
Atmospheric pressure in in.Hg. - ✔✔✔ ANSWER 29.29 in.HG
Atmospheric pressure in psi - ✔✔✔ ANSWER 14.7 psi
Boiler CO2 readings of 12.5% over fire, 11.5% in the second pass, and 8% at the
damper indicate____? - ✔✔✔ ANSWER leaks through the boiler side wall
Boiler Heating Surface (tubes) = - ✔✔✔ ANSWER = C x L x #
C = Circumference of tubes
L = Length of tubes
