HVAC AIR CONDITION LATEST
ESCO EXAM QUESTIONS
AND ANSWERS 2026 -
2027
An increase in head pressure causes _________ refrigerant to flow
through a capillary tube - ANSWERS-More
With an automatic expansion valve, an increase in evaporator load will
cause the - ANSWERS-Automatic expansion valve to close
When a TEV or capillary tube is used as a metering device, a low
refrigerant charge will cause - ANSWERS-Low head pressure
What is the maximum operating pressure setting for an acetylene torch?
- ANSWERS-15 psig
When connecting copper to steel, the recommended brazing filler alloy
is a - ANSWERS-45 percent silver alloy
Solid contaminants, such as sludge and carbon, from a severe hermetic
compressor motor burn out are best - ANSWERS-By flushing the
END OF
PAGE
1
, HVAC AIR CONDITION LATEST
ESCO EXAM QUESTIONS
AND ANSWERS 2026 -
2027
system and then installing filter/ driers in both the liquid and suction
lines
If the cut-off plate is removed from a blower assembly, how would this
affect blower performance? - ANSWERS-It would reduce air flow
At a residential service call "no cooling" complaint, the service
technician finds the unit to be completely out of refrigerant the
technician decides to use a trace amount of refrigerant and _________ in
order to pressurize the system - ANSWERS-An inert gas
A technician has found an air conditioning system with a leak in the
liquid line. After the line is repaired, the system is evacuated and
properly recharged. When the system is started, the compressor is noisy
and running hot. The most probable cause of noise is - ANSWERS-Low
oil in the system
An air conditioning system that is oversized can cause - ANSWERS-
Inefficient dehumidification of the conditioned space
END OF
PAGE
2
, HVAC AIR CONDITION LATEST
ESCO EXAM QUESTIONS
AND ANSWERS 2026 -
2027
While troubleshooting a residential split system, the service technician
finds low operating pressures and low system amperage draw. This
could be an indication of - ANSWERS-Low airflow across the
evaporator
Air or other non-condensable gases in a capillary tube air conditioning
system will cause these symptoms - ANSWERS-High suction pressure
and high discharge pressure
A refrigerant overcharge in a capillary tube air conditioning system will
cause these symptoms - ANSWERS-High suction pressure and high
discharge pressure
A compressor unit that has a broken reed valve will cause these
symptoms - ANSWERS-High suction pressure and low discharge
pressure
END OF
PAGE
3
ESCO EXAM QUESTIONS
AND ANSWERS 2026 -
2027
An increase in head pressure causes _________ refrigerant to flow
through a capillary tube - ANSWERS-More
With an automatic expansion valve, an increase in evaporator load will
cause the - ANSWERS-Automatic expansion valve to close
When a TEV or capillary tube is used as a metering device, a low
refrigerant charge will cause - ANSWERS-Low head pressure
What is the maximum operating pressure setting for an acetylene torch?
- ANSWERS-15 psig
When connecting copper to steel, the recommended brazing filler alloy
is a - ANSWERS-45 percent silver alloy
Solid contaminants, such as sludge and carbon, from a severe hermetic
compressor motor burn out are best - ANSWERS-By flushing the
END OF
PAGE
1
, HVAC AIR CONDITION LATEST
ESCO EXAM QUESTIONS
AND ANSWERS 2026 -
2027
system and then installing filter/ driers in both the liquid and suction
lines
If the cut-off plate is removed from a blower assembly, how would this
affect blower performance? - ANSWERS-It would reduce air flow
At a residential service call "no cooling" complaint, the service
technician finds the unit to be completely out of refrigerant the
technician decides to use a trace amount of refrigerant and _________ in
order to pressurize the system - ANSWERS-An inert gas
A technician has found an air conditioning system with a leak in the
liquid line. After the line is repaired, the system is evacuated and
properly recharged. When the system is started, the compressor is noisy
and running hot. The most probable cause of noise is - ANSWERS-Low
oil in the system
An air conditioning system that is oversized can cause - ANSWERS-
Inefficient dehumidification of the conditioned space
END OF
PAGE
2
, HVAC AIR CONDITION LATEST
ESCO EXAM QUESTIONS
AND ANSWERS 2026 -
2027
While troubleshooting a residential split system, the service technician
finds low operating pressures and low system amperage draw. This
could be an indication of - ANSWERS-Low airflow across the
evaporator
Air or other non-condensable gases in a capillary tube air conditioning
system will cause these symptoms - ANSWERS-High suction pressure
and high discharge pressure
A refrigerant overcharge in a capillary tube air conditioning system will
cause these symptoms - ANSWERS-High suction pressure and high
discharge pressure
A compressor unit that has a broken reed valve will cause these
symptoms - ANSWERS-High suction pressure and low discharge
pressure
END OF
PAGE
3
