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ABSA 4B FINAL EXAM AND PRACTICE EXAM 2025/2026
WITH COMPLETE QUESTIONS AND VERIFIED ANSWERS
|ALREADY GRADED A+|
The high limit pressure control will shut down the boiler by
shutting off the fuel supply when the ____ beyond the operating
pressure setpoint range.
steam temperature decreases
steam flow rate increases
steam temperature increases
steam pressure decreases
steam pressure increases - ANSWER-e
Mechanical purging systems installed on a absorption
refrigeration system have the following components installed:
Select all that apply (6/7)
Purge pickup tube
Oil trap
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Manual shutoff valve
Compressor
Purge chamber
Safety solenoid valve
Vacuum pump - ANSWER-abcefg
____ are chemicals injected into the boiler feedwater to change
scale forming salts into sludge.
Organics
Amines
Chelants
Phosphates - ANSWER-d
Non-flammable is a refrigerant characteristic of ____.
Group B2 refrigerants
Group B refrigerants
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Group A refrigerants
Group B3 refrigerants
Group B1 refrigerants - ANSWER-c
It is not unordinary for tube condensation and the flue gas to
appear smokey during the ____.
boilers peak load period
boilers maintenance period
boilers shutdown period
boiler normal operating period
boilers initial warm-up period - ANSWER-e
The concentration of sludge can be decreased by ____.
replacing the filters upstream the mud drum
blowing down the mud drum
chemically injecting chelant into the mud drum
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chemically injected amines into the mud drum
operating the purge valve - ANSWER-b
To evaporate the water concentration in the weak lithium bromide
solution, an absorption system generator uses ____.
freon
vapour pressure
air pressure
water pressure
waste heat - ANSWER-e
It is proper procedure to have the ____ and the discharge valve
opened of a back up positive displacement pump.
suction valve closed
suction valve throttled 75%
suction valve throttled 25%
suction valve throttled 50%
ABSA 4B FINAL EXAM AND PRACTICE EXAM 2025/2026
WITH COMPLETE QUESTIONS AND VERIFIED ANSWERS
|ALREADY GRADED A+|
The high limit pressure control will shut down the boiler by
shutting off the fuel supply when the ____ beyond the operating
pressure setpoint range.
steam temperature decreases
steam flow rate increases
steam temperature increases
steam pressure decreases
steam pressure increases - ANSWER-e
Mechanical purging systems installed on a absorption
refrigeration system have the following components installed:
Select all that apply (6/7)
Purge pickup tube
Oil trap
, Page |2
Manual shutoff valve
Compressor
Purge chamber
Safety solenoid valve
Vacuum pump - ANSWER-abcefg
____ are chemicals injected into the boiler feedwater to change
scale forming salts into sludge.
Organics
Amines
Chelants
Phosphates - ANSWER-d
Non-flammable is a refrigerant characteristic of ____.
Group B2 refrigerants
Group B refrigerants
, Page |3
Group A refrigerants
Group B3 refrigerants
Group B1 refrigerants - ANSWER-c
It is not unordinary for tube condensation and the flue gas to
appear smokey during the ____.
boilers peak load period
boilers maintenance period
boilers shutdown period
boiler normal operating period
boilers initial warm-up period - ANSWER-e
The concentration of sludge can be decreased by ____.
replacing the filters upstream the mud drum
blowing down the mud drum
chemically injecting chelant into the mud drum
, Page |4
chemically injected amines into the mud drum
operating the purge valve - ANSWER-b
To evaporate the water concentration in the weak lithium bromide
solution, an absorption system generator uses ____.
freon
vapour pressure
air pressure
water pressure
waste heat - ANSWER-e
It is proper procedure to have the ____ and the discharge valve
opened of a back up positive displacement pump.
suction valve closed
suction valve throttled 75%
suction valve throttled 25%
suction valve throttled 50%
