ALABAMA REFRIGERATION CONTRACTOR
EXAMINATION COMPLETE QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
1.
A refrigeration system has a properly operating compressor, but the
evaporator pressure is significantly lower than normal while the
superheat is unusually high. Which condition is most likely responsible?
A. Overcharged system
B. Restricted liquid-line flow
C. Excessive condenser airflow
D. Oversized evaporator
Answer: B. Restricted liquid-line flow
Rationale: A liquid-line restriction starves the evaporator, causing low
suction pressure and elevated superheat because insufficient
refrigerant reaches the evaporator.
2.
When installing a thermostatic expansion valve, why should the sensing
bulb normally be mounted securely on the suction line?
A. To measure condenser temperature
B. To sense evaporator outlet temperature
,C. To increase compressor horsepower
D. To regulate condenser airflow
Answer: B. To sense evaporator outlet temperature
Rationale: The TXV uses suction-line temperature at the evaporator
outlet to regulate refrigerant flow and maintain appropriate evaporator
superheat.
3.
A refrigeration compressor repeatedly cycles on its internal overload
during operation. Which condition should a technician investigate first
when diagnosing this problem?
A. Excessive compressor operating temperature
B. Low evaporator humidity
C. Clean condenser coil
D. Proper suction superheat
Answer: A. Excessive compressor operating temperature
Rationale: Compressor overheating can result from high condensing
pressure, insufficient cooling, electrical problems, low suction pressure,
or inadequate refrigerant return.
4.
What is the primary purpose of a liquid receiver installed in a
refrigeration system?
,A. Remove moisture from refrigerant
B. Store liquid refrigerant during varying operating conditions
C. Increase evaporator superheat
D. Filter compressor oil
Answer: B. Store liquid refrigerant during varying operating conditions
Rationale: A receiver provides a controlled reservoir for liquid
refrigerant, particularly when system conditions require different
refrigerant quantities.
5.
Why is a filter-drier commonly installed in the liquid line of a
refrigeration system?
A. To increase compressor displacement
B. To remove moisture and contaminants from refrigerant
C. To reduce evaporator surface area
D. To raise suction pressure
Answer: B. To remove moisture and contaminants from refrigerant
Rationale: Filter-driers capture contaminants and absorb moisture that
could otherwise cause corrosion, freezing, acid formation, or metering-
device problems.
6.
, During evacuation, why should a refrigeration technician use a properly
calibrated micron gauge instead of relying solely on a compound
pressure gauge?
A. Compound gauges measure electrical resistance
B. Micron gauges accurately indicate deep vacuum levels
C. Micron gauges measure compressor horsepower
D. Compound gauges measure superheat directly
Answer: B. Micron gauges accurately indicate deep vacuum levels
Rationale: Deep evacuation pressures are far below the useful
resolution of ordinary compound gauges, making a micron gauge
essential for accurate evacuation verification.
7.
A system reaches the desired vacuum but quickly rises after the
vacuum pump is isolated. What should the technician suspect first?
A. Perfectly dry system
B. Moisture or a system leak
C. Excessive condenser airflow
D. Oversized compressor
Answer: B. Moisture or a system leak
Rationale: Vacuum rise can indicate remaining moisture boiling off or
refrigerant entering through a leak, requiring additional testing before
charging.
EXAMINATION COMPLETE QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
1.
A refrigeration system has a properly operating compressor, but the
evaporator pressure is significantly lower than normal while the
superheat is unusually high. Which condition is most likely responsible?
A. Overcharged system
B. Restricted liquid-line flow
C. Excessive condenser airflow
D. Oversized evaporator
Answer: B. Restricted liquid-line flow
Rationale: A liquid-line restriction starves the evaporator, causing low
suction pressure and elevated superheat because insufficient
refrigerant reaches the evaporator.
2.
When installing a thermostatic expansion valve, why should the sensing
bulb normally be mounted securely on the suction line?
A. To measure condenser temperature
B. To sense evaporator outlet temperature
,C. To increase compressor horsepower
D. To regulate condenser airflow
Answer: B. To sense evaporator outlet temperature
Rationale: The TXV uses suction-line temperature at the evaporator
outlet to regulate refrigerant flow and maintain appropriate evaporator
superheat.
3.
A refrigeration compressor repeatedly cycles on its internal overload
during operation. Which condition should a technician investigate first
when diagnosing this problem?
A. Excessive compressor operating temperature
B. Low evaporator humidity
C. Clean condenser coil
D. Proper suction superheat
Answer: A. Excessive compressor operating temperature
Rationale: Compressor overheating can result from high condensing
pressure, insufficient cooling, electrical problems, low suction pressure,
or inadequate refrigerant return.
4.
What is the primary purpose of a liquid receiver installed in a
refrigeration system?
,A. Remove moisture from refrigerant
B. Store liquid refrigerant during varying operating conditions
C. Increase evaporator superheat
D. Filter compressor oil
Answer: B. Store liquid refrigerant during varying operating conditions
Rationale: A receiver provides a controlled reservoir for liquid
refrigerant, particularly when system conditions require different
refrigerant quantities.
5.
Why is a filter-drier commonly installed in the liquid line of a
refrigeration system?
A. To increase compressor displacement
B. To remove moisture and contaminants from refrigerant
C. To reduce evaporator surface area
D. To raise suction pressure
Answer: B. To remove moisture and contaminants from refrigerant
Rationale: Filter-driers capture contaminants and absorb moisture that
could otherwise cause corrosion, freezing, acid formation, or metering-
device problems.
6.
, During evacuation, why should a refrigeration technician use a properly
calibrated micron gauge instead of relying solely on a compound
pressure gauge?
A. Compound gauges measure electrical resistance
B. Micron gauges accurately indicate deep vacuum levels
C. Micron gauges measure compressor horsepower
D. Compound gauges measure superheat directly
Answer: B. Micron gauges accurately indicate deep vacuum levels
Rationale: Deep evacuation pressures are far below the useful
resolution of ordinary compound gauges, making a micron gauge
essential for accurate evacuation verification.
7.
A system reaches the desired vacuum but quickly rises after the
vacuum pump is isolated. What should the technician suspect first?
A. Perfectly dry system
B. Moisture or a system leak
C. Excessive condenser airflow
D. Oversized compressor
Answer: B. Moisture or a system leak
Rationale: Vacuum rise can indicate remaining moisture boiling off or
refrigerant entering through a leak, requiring additional testing before
charging.
