CDARS Red Seal
Examination – Refrigeration
and Air Conditioning
Mechanic
,Record 2173
Question 1. Two explanations are needed, one for "Services control systems" and one for
"Operates specialized refrigeration equipment". Which option supplies the appropriate content
in that order?
A. First: Interprets wiring diagrams, schematics, and ladder logic diagrams. Second: Diagnoses operational
faults (low refrigerant charge, restricted liquid line, non-condensables, compressor flooding,
superheat/subcooling anomalies).
B. First: manifold gauges, vacuum pumps, recovery units, electronic leak detectors. Second: Interprets
wiring diagrams, schematics, and ladder logic diagrams.
C. First: Interprets wiring diagrams, schematics, and ladder logic diagrams. Second: manifold gauges,
vacuum pumps, recovery units, electronic leak detectors.
D. First: Services expansion devices (thermostatic expansion valves, capillary tubes, electronic expansion
valves, automatic expansion valves). Second: manifold gauges, vacuum pumps, recovery units,
electronic leak detectors.
Correct Answer: C
Full Explanation:
"Services control systems" addresses "Interprets wiring diagrams, schematics, and ladder logic diagrams".
"Operates specialized refrigeration equipment" addresses "manifold gauges, vacuum pumps, recovery units,
electronic leak detectors". Matching only one explanation is insufficient. The selected answer preserves both
the subject matter and the requested order.
Question 2. An activity focuses on "Services air-source and ground-source (geothermal) heat
pump systems". The next activity focuses on "Calculates thermodynamic properties (pressure,
temperature, heat transfer)". Which two subject areas are represented, in order?
A. First: Applies refrigeration principles and theories; second: Services heat pumps and auxiliary heating.
B. First: Services heat pumps and auxiliary heating; second: Applies refrigeration principles and theories.
C. First: Services heat pumps and auxiliary heating; second: Services and repairs compressors.
D. First: Services control systems; second: Applies refrigeration principles and theories.
Correct Answer: B
Full Explanation:
"Services heat pumps and auxiliary heating" addresses "Services air-source and ground-source (geothermal)
heat pump systems". "Applies refrigeration principles and theories" addresses "Calculates thermodynamic
properties (pressure, temperature, heat transfer)". The answer must identify the initial area and the
subsequent area without reversing them or introducing a third subject.
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,Record 2173
Question 3. For the descriptions I: "air-cooling, liquid-cooling, shell-and-tube, defrost
systems", II: "Analyzes system operating logs for performance deviations", and III:
"elastomeric, fiberglass, cellular glass", a response gives the labels "Services evaporators",
"Applies thermal insulation", and "Performs scheduled maintenance" respectively. What
correction is needed?
A. Exchange the labels for II and III.
B. Exchange the labels for I and III.
C. Exchange the labels for I and II.
D. Keep all three labels as written.
Correct Answer: A
Full Explanation:
"Services evaporators" addresses "air-cooling, liquid-cooling, shell-and-tube, defrost systems". "Performs
scheduled maintenance" addresses "Analyzes system operating logs for performance deviations". "Applies
thermal insulation" addresses "elastomeric, fiberglass, cellular glass". The first assignment is correct, while
the second and third are reversed. Exchanging II and III restores all three associations.
Question 4. A response needs to address both "Evaporators, Condensers and Auxiliary
Equipment" and "Uses tools and equipment". Which combination retains an appropriate
example for each?
A. Uses measuring and testing instruments (multimeters, thermometers, anemometers, psychrometers);
together with Handles hazardous materials using WHMIS and TDG standards.
B. Services heat transfer components; together with Performs scheduled maintenance.
C. Services heat transfer components; together with Uses measuring and testing instruments (multimeters,
thermometers, anemometers, psychrometers).
D. Performs scheduled maintenance; together with Handles hazardous materials using WHMIS and TDG
standards.
Correct Answer: C
Full Explanation:
"Evaporators, Condensers and Auxiliary Equipment" addresses "Services heat transfer components". "Uses
tools and equipment" addresses "Uses measuring and testing instruments (multimeters, thermometers,
anemometers, psychrometers)". The correct combination includes content from each required area. A
combination that omits one required area cannot fully answer the task.
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, Record 2173
Question 5. A task requires attention to "Decommissions systems". A proposed response
instead describes "air-cooled, water-cooled, evaporative". Which replacement would most
directly address the required subject?
A. Pumps down and recovers refrigerant from systems
B. Handles steel and black iron piping (threading, grooving)
C. air-cooled, water-cooled, evaporative
D. Performs deep vacuum dehydration
Correct Answer: A
Full Explanation:
"Decommissions systems" addresses "Pumps down and recovers refrigerant from systems". "Services
condensers" addresses "air-cooled, water-cooled, evaporative". The original response addresses a different
subject. Replacing it with content directly related to the required area corrects the mismatch.
Question 6. The following descriptions need names: I, "Troubleshoots and repairs system
faults"; II, "Services auxiliary electric resistance heating and hydronic heating integration
components". Which option names both accurately?
A. I: Maintenance, Troubleshooting and Repair; II: Services electric motors.
B. I: Services heat pumps and auxiliary heating; II: Maintenance, Troubleshooting and Repair.
C. I: Maintenance, Troubleshooting and Repair; II: Services heat pumps and auxiliary heating.
D. I: Services control systems; II: Services heat pumps and auxiliary heating.
Correct Answer: C
Full Explanation:
"Maintenance, Troubleshooting and Repair" addresses "Troubleshoots and repairs system faults". "Services
heat pumps and auxiliary heating" addresses "Services auxiliary electric resistance heating and hydronic
heating integration components". Both names must be correct. A choice that retains one correct name but
substitutes or reverses the other is incomplete.
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Examination – Refrigeration
and Air Conditioning
Mechanic
,Record 2173
Question 1. Two explanations are needed, one for "Services control systems" and one for
"Operates specialized refrigeration equipment". Which option supplies the appropriate content
in that order?
A. First: Interprets wiring diagrams, schematics, and ladder logic diagrams. Second: Diagnoses operational
faults (low refrigerant charge, restricted liquid line, non-condensables, compressor flooding,
superheat/subcooling anomalies).
B. First: manifold gauges, vacuum pumps, recovery units, electronic leak detectors. Second: Interprets
wiring diagrams, schematics, and ladder logic diagrams.
C. First: Interprets wiring diagrams, schematics, and ladder logic diagrams. Second: manifold gauges,
vacuum pumps, recovery units, electronic leak detectors.
D. First: Services expansion devices (thermostatic expansion valves, capillary tubes, electronic expansion
valves, automatic expansion valves). Second: manifold gauges, vacuum pumps, recovery units,
electronic leak detectors.
Correct Answer: C
Full Explanation:
"Services control systems" addresses "Interprets wiring diagrams, schematics, and ladder logic diagrams".
"Operates specialized refrigeration equipment" addresses "manifold gauges, vacuum pumps, recovery units,
electronic leak detectors". Matching only one explanation is insufficient. The selected answer preserves both
the subject matter and the requested order.
Question 2. An activity focuses on "Services air-source and ground-source (geothermal) heat
pump systems". The next activity focuses on "Calculates thermodynamic properties (pressure,
temperature, heat transfer)". Which two subject areas are represented, in order?
A. First: Applies refrigeration principles and theories; second: Services heat pumps and auxiliary heating.
B. First: Services heat pumps and auxiliary heating; second: Applies refrigeration principles and theories.
C. First: Services heat pumps and auxiliary heating; second: Services and repairs compressors.
D. First: Services control systems; second: Applies refrigeration principles and theories.
Correct Answer: B
Full Explanation:
"Services heat pumps and auxiliary heating" addresses "Services air-source and ground-source (geothermal)
heat pump systems". "Applies refrigeration principles and theories" addresses "Calculates thermodynamic
properties (pressure, temperature, heat transfer)". The answer must identify the initial area and the
subsequent area without reversing them or introducing a third subject.
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,Record 2173
Question 3. For the descriptions I: "air-cooling, liquid-cooling, shell-and-tube, defrost
systems", II: "Analyzes system operating logs for performance deviations", and III:
"elastomeric, fiberglass, cellular glass", a response gives the labels "Services evaporators",
"Applies thermal insulation", and "Performs scheduled maintenance" respectively. What
correction is needed?
A. Exchange the labels for II and III.
B. Exchange the labels for I and III.
C. Exchange the labels for I and II.
D. Keep all three labels as written.
Correct Answer: A
Full Explanation:
"Services evaporators" addresses "air-cooling, liquid-cooling, shell-and-tube, defrost systems". "Performs
scheduled maintenance" addresses "Analyzes system operating logs for performance deviations". "Applies
thermal insulation" addresses "elastomeric, fiberglass, cellular glass". The first assignment is correct, while
the second and third are reversed. Exchanging II and III restores all three associations.
Question 4. A response needs to address both "Evaporators, Condensers and Auxiliary
Equipment" and "Uses tools and equipment". Which combination retains an appropriate
example for each?
A. Uses measuring and testing instruments (multimeters, thermometers, anemometers, psychrometers);
together with Handles hazardous materials using WHMIS and TDG standards.
B. Services heat transfer components; together with Performs scheduled maintenance.
C. Services heat transfer components; together with Uses measuring and testing instruments (multimeters,
thermometers, anemometers, psychrometers).
D. Performs scheduled maintenance; together with Handles hazardous materials using WHMIS and TDG
standards.
Correct Answer: C
Full Explanation:
"Evaporators, Condensers and Auxiliary Equipment" addresses "Services heat transfer components". "Uses
tools and equipment" addresses "Uses measuring and testing instruments (multimeters, thermometers,
anemometers, psychrometers)". The correct combination includes content from each required area. A
combination that omits one required area cannot fully answer the task.
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, Record 2173
Question 5. A task requires attention to "Decommissions systems". A proposed response
instead describes "air-cooled, water-cooled, evaporative". Which replacement would most
directly address the required subject?
A. Pumps down and recovers refrigerant from systems
B. Handles steel and black iron piping (threading, grooving)
C. air-cooled, water-cooled, evaporative
D. Performs deep vacuum dehydration
Correct Answer: A
Full Explanation:
"Decommissions systems" addresses "Pumps down and recovers refrigerant from systems". "Services
condensers" addresses "air-cooled, water-cooled, evaporative". The original response addresses a different
subject. Replacing it with content directly related to the required area corrects the mismatch.
Question 6. The following descriptions need names: I, "Troubleshoots and repairs system
faults"; II, "Services auxiliary electric resistance heating and hydronic heating integration
components". Which option names both accurately?
A. I: Maintenance, Troubleshooting and Repair; II: Services electric motors.
B. I: Services heat pumps and auxiliary heating; II: Maintenance, Troubleshooting and Repair.
C. I: Maintenance, Troubleshooting and Repair; II: Services heat pumps and auxiliary heating.
D. I: Services control systems; II: Services heat pumps and auxiliary heating.
Correct Answer: C
Full Explanation:
"Maintenance, Troubleshooting and Repair" addresses "Troubleshoots and repairs system faults". "Services
heat pumps and auxiliary heating" addresses "Services auxiliary electric resistance heating and hydronic
heating integration components". Both names must be correct. A choice that retains one correct name but
substitutes or reverses the other is incomplete.
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