Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
ABSA 4B FINAL EXAM, PRACTICE EXAM AND STUDY GUIDE (ALL IN ONE
DOCUMENT) NEWEST 2025 COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
The oil used in ____ must be able to dissipate the compressor heat and be easily separated
from the refrigerant.
refrigeration compressors
reciprocating pumps
air compressors
steam turbines
gas turbines - ANSWER-a
The antifriction bearing housing should have 2/3rd of empty space remaining after being
topped up with ____.
crude
water
lubrication
mineral oil
grease - ANSWER-e
Ammonia refrigerants have a high affinity for ____.
non-condensable gases
corrosion
coagulants
1|Page
, Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
water
flocculants - ANSWER-d
A ____ is a simple machine with two or more pulleys with a rope or cable threaded between
them.
hoist
hacksaw
block and tackle
scaffolding
portable grinder - ANSWER-c
____ is one of the primary disadvantages of electric heating.
Response time
Increased corrosion
Increased operating cost
Decreased heat output
Increased maintenance costs - ANSWER-c
____ protocol should be used if the boiler will be exposed to subfreezing temperatures or will
be shut down for an extended period or when there will be no foreseeable urgency to restart
the boiler.
Hot boiler lay-up
Ready boiler lay-up
Wet boiler lay-up
2|Page
, Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
Active boiler lay-up
Dry boiler lay-up - ANSWER-e
A hammer is classified as a ____.
recording device
power tool
hand tool
measurement device
calibration device - ANSWER-c
____ is too toxic to be used as a refrigerant in building air conditioning systems.
Water
Freon
Lithium Bromide
Air
Ammonia - ANSWER-e
The biological breakdown of bacteria in a closed vessel could produce ____.
water
air
precipitation
oxygen
methane gases - ANSWER-e
3|Page
, Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
Boiler feedwater is chemically treated to:
Reduce foaming
Reduce scale formation
Minimize boiler metal corrosion
Reduce carryover
All of the above - ANSWER-e
A ____ is a simple machine used to lift or pull heavy loads with two or more pulleys with a rope
or cable threaded between them.
hoist
hacksaw
block and tackle
portable grinder
scaffolding - ANSWER-c
To prevent accumulation of oil deposits in ____ downstream equipment must be installed to
filter and remove the oil from the air.
four stroke engines
reciprocating engines
labyrinth seals
compressed air systems
two stroke engines - ANSWER-d
4|Page
ABSA 4B FINAL EXAM, PRACTICE EXAM AND STUDY GUIDE (ALL IN ONE
DOCUMENT) NEWEST 2025 COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
The oil used in ____ must be able to dissipate the compressor heat and be easily separated
from the refrigerant.
refrigeration compressors
reciprocating pumps
air compressors
steam turbines
gas turbines - ANSWER-a
The antifriction bearing housing should have 2/3rd of empty space remaining after being
topped up with ____.
crude
water
lubrication
mineral oil
grease - ANSWER-e
Ammonia refrigerants have a high affinity for ____.
non-condensable gases
corrosion
coagulants
1|Page
, Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
water
flocculants - ANSWER-d
A ____ is a simple machine with two or more pulleys with a rope or cable threaded between
them.
hoist
hacksaw
block and tackle
scaffolding
portable grinder - ANSWER-c
____ is one of the primary disadvantages of electric heating.
Response time
Increased corrosion
Increased operating cost
Decreased heat output
Increased maintenance costs - ANSWER-c
____ protocol should be used if the boiler will be exposed to subfreezing temperatures or will
be shut down for an extended period or when there will be no foreseeable urgency to restart
the boiler.
Hot boiler lay-up
Ready boiler lay-up
Wet boiler lay-up
2|Page
, Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
Active boiler lay-up
Dry boiler lay-up - ANSWER-e
A hammer is classified as a ____.
recording device
power tool
hand tool
measurement device
calibration device - ANSWER-c
____ is too toxic to be used as a refrigerant in building air conditioning systems.
Water
Freon
Lithium Bromide
Air
Ammonia - ANSWER-e
The biological breakdown of bacteria in a closed vessel could produce ____.
water
air
precipitation
oxygen
methane gases - ANSWER-e
3|Page
, Absa 4b Final Exam, Practice Exam And Study Guide (All In One Document)
Boiler feedwater is chemically treated to:
Reduce foaming
Reduce scale formation
Minimize boiler metal corrosion
Reduce carryover
All of the above - ANSWER-e
A ____ is a simple machine used to lift or pull heavy loads with two or more pulleys with a rope
or cable threaded between them.
hoist
hacksaw
block and tackle
portable grinder
scaffolding - ANSWER-c
To prevent accumulation of oil deposits in ____ downstream equipment must be installed to
filter and remove the oil from the air.
four stroke engines
reciprocating engines
labyrinth seals
compressed air systems
two stroke engines - ANSWER-d
4|Page
