ABSA 4B FINAL EXAM 2 VERSIONS AND
PRACTICE EXAM 2025/2026 BANK
COMPLETE QUESTIONS AND ANSWERS
ACCURATE ACTUAL EXAM WITH
FREQUENTLY TESTED QUESTIONS AND
STUDY GUIDE / EXPERT VERIFIED FOR
GUARANTEED PASS/ALREADY GRADED A+
VERSION A
When using lighted sulphur candles to test for ammonia
leaks in a
refrigeration system, the presence of ammonia will be
indicated by
a) a cloud of yellow smoke
b) light brown smoke
c) heavy white smoke
d) heavy black smoke
e) light red smoke - ....ANSWER...C
Leak testing for tightness under pressure of a refrigeration
system
,a) is done by the manufacturer
b) is done with oxygen
c) is done with ammonia
d) is done with an inert gas
e) is done with softened water - ....ANSWER...D
Leak testing on a refrigeration system
a) is done with a sulphur stick for freon refrigerant
b) is done with litmus paper for freon
c) is done with a sulphur candle for ammonia
d) must be done with the compressor running
e) is done with a vacuum on the system - ....ANSWER...C
Which of the following is not a recommended step for the
procedure in which dry nitrogen is used for a system leak
test?
a) Remove controls and relief valves which may be damaged
by
the test pressure.
b) Connect the nitrogen cylinder to the system charging
valve.
,c) Close the liquid line shut-off valve.
d) Open the liquid line shut-off valve.
e) Set the pressure reducing valve for the minimum design
pressure of the high side. - ....ANSWER...D
A sulphur candle is a test for
a) freon leaks
b) ammonia leaks
c) air leaks
d) vacuum seal
e) CFC leaks - ....ANSWER...B
Before charging a system which of the following needs to be
done?
a) Interlocks need to be tested
b) Controls need to be set
c) Controls need to be set
d) Required valves need to be opened
e) All of the above - ....ANSWER...E
, The initial refrigerant charge is given where on the system?
a) The high side of the system
b) The low side of the system
c) The evaporator
d) The expansion valve
e) The heat exchanger - ....ANSWER...A
Frost formation on the suction line indicates what?
a) Moisture in the system
b) "Copper-Plating" on the bearings and compressor exhaust
valve
c) Overcharging the system
d) Thermostat controlled solenoid deterioration
e) Inadequate levels of refrigerant in the system -
....ANSWER...C
The liquid line shutoff valve is
a) used when purging the system
b) a regulating valve
c) used to relieve pressure
d) required to be closed when charging the system
PRACTICE EXAM 2025/2026 BANK
COMPLETE QUESTIONS AND ANSWERS
ACCURATE ACTUAL EXAM WITH
FREQUENTLY TESTED QUESTIONS AND
STUDY GUIDE / EXPERT VERIFIED FOR
GUARANTEED PASS/ALREADY GRADED A+
VERSION A
When using lighted sulphur candles to test for ammonia
leaks in a
refrigeration system, the presence of ammonia will be
indicated by
a) a cloud of yellow smoke
b) light brown smoke
c) heavy white smoke
d) heavy black smoke
e) light red smoke - ....ANSWER...C
Leak testing for tightness under pressure of a refrigeration
system
,a) is done by the manufacturer
b) is done with oxygen
c) is done with ammonia
d) is done with an inert gas
e) is done with softened water - ....ANSWER...D
Leak testing on a refrigeration system
a) is done with a sulphur stick for freon refrigerant
b) is done with litmus paper for freon
c) is done with a sulphur candle for ammonia
d) must be done with the compressor running
e) is done with a vacuum on the system - ....ANSWER...C
Which of the following is not a recommended step for the
procedure in which dry nitrogen is used for a system leak
test?
a) Remove controls and relief valves which may be damaged
by
the test pressure.
b) Connect the nitrogen cylinder to the system charging
valve.
,c) Close the liquid line shut-off valve.
d) Open the liquid line shut-off valve.
e) Set the pressure reducing valve for the minimum design
pressure of the high side. - ....ANSWER...D
A sulphur candle is a test for
a) freon leaks
b) ammonia leaks
c) air leaks
d) vacuum seal
e) CFC leaks - ....ANSWER...B
Before charging a system which of the following needs to be
done?
a) Interlocks need to be tested
b) Controls need to be set
c) Controls need to be set
d) Required valves need to be opened
e) All of the above - ....ANSWER...E
, The initial refrigerant charge is given where on the system?
a) The high side of the system
b) The low side of the system
c) The evaporator
d) The expansion valve
e) The heat exchanger - ....ANSWER...A
Frost formation on the suction line indicates what?
a) Moisture in the system
b) "Copper-Plating" on the bearings and compressor exhaust
valve
c) Overcharging the system
d) Thermostat controlled solenoid deterioration
e) Inadequate levels of refrigerant in the system -
....ANSWER...C
The liquid line shutoff valve is
a) used when purging the system
b) a regulating valve
c) used to relieve pressure
d) required to be closed when charging the system
