ABSA EXAM QUESTIONS WITH
CORRECT SOLUTIONS||UPDATED
2026/2027 SYLLABUS||100%
GUARANTEED PASS||<<LATEST
VERSION>>
R4B05-04-04-01 Smaller boilers are not often cleaned chemically because:
Select one:
a.most small boilers are firetube designs, which are best cleaned mechanically.
b.small boilers have thin metal, and may be damaged by cleaning chemicals.
c.small boilers develop little waterside scale, because of their low steaming rates.
d.the expense of chemicals, complex piping, and pumping systems may not be
justified for cleaning smaller boilers. - ANSWER ✓ d.the expense of chemicals,
complex piping, and pumping systems may not be justified for cleaning smaller
boilers.
R4B05-04-01-01 Prior to a worker entering the steam drum of an off-line boiler
that is connected to a common, pressurized steam header, the
Select one:
a.Header must be shut down and depressurized
b.Boiler Inspector must be informed before any work occurs
c.Main steam, blowdown and feedwater valves must be closed, locked and tagged
d.Drum must be vented, the safety valve must be gagged, and all ash and soot
removed from the firebox - ANSWER ✓ c.Main steam, blowdown and feedwater
valves must be closed, locked and tagged
(4-066-2.6) Filters are used:
Select one:
a.For external water treatment
b.To remove dissolved solids
c.To remove calcium bicarbonates
d.For internal treatment - ANSWER ✓ a.For external water treatment
(4-067-1.5) Caustic embrittlement of boiler metal is promoted by:
,Select one:
a.Concentrations of sodium hydroxide
b.Concentration of sodium chloride
c.Overheating of boiler parts
d.Concentration of sodium sulfite - ANSWER ✓ a.Concentrations of sodium
hydroxide
What are dip slides used for?
Select one:
a.
To prevent delignification of wooden components
b.
To test for biological activity
c.
To detect dissolved gases
d.
To detect corrosio - ANSWER ✓ b.
To test for biological activity
Scaling is not as severe in cooling towers when compared to boilers because:
Select one:
a.Cooling towers evaporate less water
b.There are not as many dissolved solids in cooling tower water
c.Water temperatures are not as high in cooling towers as they are in boilers
d.Cooling tower water is constantly being aerated - ANSWER ✓ c.Water
temperatures are not as high in cooling towers as they are in boilers
(4-070-5.3) Organic growth, also called ________ can reduce the flow rates in
cooling tower tubes and channels.
Select one:
a.Algae
b.Slime
c.Fungi
d.Avian waste - ANSWER ✓ b.Slime
Dezincification is a form of
Select one:
a.
stress corrosion cracking
,b.
selective leaching
c.
under-deposit corrosion
d.
dielectric corrosion - ANSWER ✓ b.
selective leaching
If heating or cooling system water may come into contact with food products,
___________ is used to keep the water from freezing.
Select one:
a.
octyl alcohol
b.
ethylene glycol
c.
methanol
d.
propylene glycol - ANSWER ✓ d.
propylene glycol
(4-067-1.9) To prevent scale formation, ________ is added to the boiler water.
Select one:
a.Zeolite
b.Sodium chloride
c.Amine
d.Phosphate - ANSWER ✓ d.Phosphate
(4-067-3.11) The "total" or "methyl" alkalinity test indicates the alkalinity that is
due to:
Select one:
a.Dissolved carbon dioxide
b.Sodium Bicarbonate ions
c.Hydroxide alkalinity
d.All forms of alkalinity - ANSWER ✓ d.All forms of alkalinity
(4-067-3.3) When testing boiler water, a conductivity meter is used to measure:
Select one:
a.Total alkalinity
, b.Hardness in parts per million or grains per gallon
c.Total suspended matter
d.Total dissolved solids - ANSWER ✓ d.Total dissolved solids
The P-alkalinity is 220 ppm. The M-alkalinity is 240 ppm. What is the OH-
alkalinity?
Select one:
a.
80 ppm
b.
40 ppm
c.
200 ppm
d.
0 ppm - ANSWER ✓ c.
200 ppm
2*P-M
(4-067-1.10) Condensate return line corrosion can be controlled by:
Select one:
a.Feeding sodium bicarbonate to the boiler
b.Adding sodium sulfite
c.Feeding amines
d.Adding polymers - ANSWER ✓ c.Feeding amines
Chillers must have _____________ to protect the evaporator coil from freezing
damage.
Select one:
a.
freeze stats
b.
frost plugs
c.
heaters
d.
anti-freeze - ANSWER ✓ a.
freeze stats
CORRECT SOLUTIONS||UPDATED
2026/2027 SYLLABUS||100%
GUARANTEED PASS||<<LATEST
VERSION>>
R4B05-04-04-01 Smaller boilers are not often cleaned chemically because:
Select one:
a.most small boilers are firetube designs, which are best cleaned mechanically.
b.small boilers have thin metal, and may be damaged by cleaning chemicals.
c.small boilers develop little waterside scale, because of their low steaming rates.
d.the expense of chemicals, complex piping, and pumping systems may not be
justified for cleaning smaller boilers. - ANSWER ✓ d.the expense of chemicals,
complex piping, and pumping systems may not be justified for cleaning smaller
boilers.
R4B05-04-01-01 Prior to a worker entering the steam drum of an off-line boiler
that is connected to a common, pressurized steam header, the
Select one:
a.Header must be shut down and depressurized
b.Boiler Inspector must be informed before any work occurs
c.Main steam, blowdown and feedwater valves must be closed, locked and tagged
d.Drum must be vented, the safety valve must be gagged, and all ash and soot
removed from the firebox - ANSWER ✓ c.Main steam, blowdown and feedwater
valves must be closed, locked and tagged
(4-066-2.6) Filters are used:
Select one:
a.For external water treatment
b.To remove dissolved solids
c.To remove calcium bicarbonates
d.For internal treatment - ANSWER ✓ a.For external water treatment
(4-067-1.5) Caustic embrittlement of boiler metal is promoted by:
,Select one:
a.Concentrations of sodium hydroxide
b.Concentration of sodium chloride
c.Overheating of boiler parts
d.Concentration of sodium sulfite - ANSWER ✓ a.Concentrations of sodium
hydroxide
What are dip slides used for?
Select one:
a.
To prevent delignification of wooden components
b.
To test for biological activity
c.
To detect dissolved gases
d.
To detect corrosio - ANSWER ✓ b.
To test for biological activity
Scaling is not as severe in cooling towers when compared to boilers because:
Select one:
a.Cooling towers evaporate less water
b.There are not as many dissolved solids in cooling tower water
c.Water temperatures are not as high in cooling towers as they are in boilers
d.Cooling tower water is constantly being aerated - ANSWER ✓ c.Water
temperatures are not as high in cooling towers as they are in boilers
(4-070-5.3) Organic growth, also called ________ can reduce the flow rates in
cooling tower tubes and channels.
Select one:
a.Algae
b.Slime
c.Fungi
d.Avian waste - ANSWER ✓ b.Slime
Dezincification is a form of
Select one:
a.
stress corrosion cracking
,b.
selective leaching
c.
under-deposit corrosion
d.
dielectric corrosion - ANSWER ✓ b.
selective leaching
If heating or cooling system water may come into contact with food products,
___________ is used to keep the water from freezing.
Select one:
a.
octyl alcohol
b.
ethylene glycol
c.
methanol
d.
propylene glycol - ANSWER ✓ d.
propylene glycol
(4-067-1.9) To prevent scale formation, ________ is added to the boiler water.
Select one:
a.Zeolite
b.Sodium chloride
c.Amine
d.Phosphate - ANSWER ✓ d.Phosphate
(4-067-3.11) The "total" or "methyl" alkalinity test indicates the alkalinity that is
due to:
Select one:
a.Dissolved carbon dioxide
b.Sodium Bicarbonate ions
c.Hydroxide alkalinity
d.All forms of alkalinity - ANSWER ✓ d.All forms of alkalinity
(4-067-3.3) When testing boiler water, a conductivity meter is used to measure:
Select one:
a.Total alkalinity
, b.Hardness in parts per million or grains per gallon
c.Total suspended matter
d.Total dissolved solids - ANSWER ✓ d.Total dissolved solids
The P-alkalinity is 220 ppm. The M-alkalinity is 240 ppm. What is the OH-
alkalinity?
Select one:
a.
80 ppm
b.
40 ppm
c.
200 ppm
d.
0 ppm - ANSWER ✓ c.
200 ppm
2*P-M
(4-067-1.10) Condensate return line corrosion can be controlled by:
Select one:
a.Feeding sodium bicarbonate to the boiler
b.Adding sodium sulfite
c.Feeding amines
d.Adding polymers - ANSWER ✓ c.Feeding amines
Chillers must have _____________ to protect the evaporator coil from freezing
damage.
Select one:
a.
freeze stats
b.
frost plugs
c.
heaters
d.
anti-freeze - ANSWER ✓ a.
freeze stats
